MacBook CPU speed setting

I've been looking around on the web without much luck on how to configure my CPU speed on my macbook. I just switched from my old iBook G4, where I remember I could just go to the Energy Saver preference pane - go to options - and under all the checklist options (restart automatically...show battery status...etc etc) there's the option to set the speed to reduced, highest or automatic.
Now I go to the preference pane on my MacBook and I see that there's no option for this....?!
Where can I find this option?? There must be a way to lower the cpu speed especially with the core 2 duo chips!

It's set - no more adjustments.
Scott
Over at the macosxhints forums someone said that changing the "optimization" drop down menu in the energy saver preference pane could be used to lower and max the cpu speed...that is, setting it to "normal", "better energy savings", and "better performance".
Is this true? Does anyone know if the actual cpu speed will change with the changing of this option?

Similar Messages

Lowering CPU speed to a minimum

Hi,
How do I set the processor in my MacBook Pro to always run at the lowest speed? I can't find any settings to lower cpu speed?
Why? So that when I'm surfing, I can get the maximum run time out of my battery.
PC's have an Intel speedstep utility that allows you to set the speed to as low as possible and keep it there. Does something like this exist for my MacBook Pro?
Thanks, William
MacBook Pro Mac OS X (10.4.7) 2 Gb Ram

Hello, there is a way:
Open your System Preferences, go to Energy Saver, Show details, and there select Better Energy Settings. It's not necessary a CPU speed reducer, but you get more battery time...
The only way to reduce the CPU speed is to unplug the baterry, and run from the power adapter, which, I guess, it's not what you want.
CHeers
PS. Mark this topic as answered when satisfied with the answers.

Trackpad forgets speed setting

Under Lion, my Magic Trackpad keeps forgetting its speed settings (how quickly a single-finger motion moves the cursor on the screen). I have it set one notch down from fastest, and it will randomly reset to the middle setting. I've not had this problem before.
It might have something to do with my using Parallels Desktop with a Windows 7 virtual machine, because the mouse speed setting seems to get reset there as well. When the trackpad resets, it happens universally -- both within the VM and outside of it. I'm not sure, however, whether Parallels is the problem. I never had this issue prior to Lion.
Anyone experiencing this issue who isn't using Parallels?
Anyone having this issue WITH Parallels? If so, have you had any luck working around it? Maybe it will be fixed in the next Parallels update.
Also, I think this is a general trackpad issue -- not just with the Magic Trackpad but with the built-in trackpad on my MacBook Air as well.
Thanks in advance for any assistance.
Yes, I will post feedback both to Apple and Parallels about this.

Hi Linda,
Did you ever resolve this?
I have this issue too, but ONLY when Parallels (v6) is running. I run it in the "crystal" Coherence mode.

What should my Macbook fan speed be? and battery help

My mac goes hot real easy and my battery goes down really quick. Ive tried doing what websites have told me to do (Eg. Turn down brighness) but not helping at all. HELP

There is a free to download App called iStat, which will run in dashboard.
This will enable you to see actual temperatures at key points in the Macbook (CPU etc). It will also tell you fan speeds etc (but take care interpreting such information. It's at best a 'relative' tool)
Here is the link;
http://www.islayer.com/apps/istatpro/
If you're still worried after you see real figures, post again with the temps etc.

RAM vs. CPU speed

Hi..sorry for the uneducated question, but I'm wondering what the difference in performance is between having a fast CPU or more RAM. Where do each differ? For example, if I want to have less of the spinning beach ball..would installing more RAM help this? If so, what does the CPU speed effect? I appreciate any insight.
The reason I ask is that my MBP has 2.2Ghz but my wife's new MacBook is 2.4. So technically..is her computer 'faster' than mine? If I put in 4GB RAM..for example...how would that effect our comparison? (not that we're having a contest..I'm just wanting to know). Thanks!

The simple answer is that a faster CPU = apps running faster, and more RAM = more apps running simultaneously.
So, for example, when encoding a video in iDVD, your wife's MBP would do that slightly faster than yours (maybe a few minutes difference in a two hour process). More RAM wouldn't help that. But, if you went up to 4 GB of RAM, you could have more apps open at once without the spinning beachball, or having to wait while information is written to/read from the hard disk (virtual memory).
Hope this helps...

2009 Macbook - Inconsistent speed while on internet

My 2009 macbook internet speed has suddenly become inconsistent, but my iMac is fine. How can I troubleshoot and/or should I take it to the Genius Bar to get it evaluated?

Is your internet connection one based on wi-fi, or do you have
and use an Ethernet connection via a wired router? Have you
tested an alternative to what you are having issue with now?
And, have you tried a different Location and settings, to see
if the issue goes away? Or have you reset the base station
if the issue is with wi-fi?
Are there any items nearby that cause interference with wi-fi,
if that is what you are using? A microwave oven, a cordless
household telephone, a commerical radio tower, or some other
device you own that shares the wireless frequency w/ wi-fi?
•Wi-Fi: How to troubleshoot Wi-Fi connectivity:
http://support.apple.com/kb/HT4628?viewlocale=en_US
•Solutions for connecting to the internet, setting up small
network, and troubleshooting (wi-fi, ethernet, etc)
http://support.apple.com/kb/ht1714
There are several things to try & determine a cause.
That is why is it called troubleshooting. It is trouble
and rarely is it resolved by violent expression...
Good luck & happy computing!

Minimum cpu speed for 10g on RHAS3

Is there any way past the universal installer check for minimum cpu speed? I have met all the system requirements to install oracle forms client on redhat as -- but this is an older test box and it is slightly slower than the minimum requirements so I was not able to run the installer. Any suggestions?

Hi,
You can find all the useful informations about Update Rate of a FieldPoint Ethernet Network Controller at this link:
http://digital.ni.com/public.nsf/allkb/24FB518E1D24674686256DD7000C1EFA?OpenDocument
Regarding the minimum possible speed network to comunicate to FP, it's depends on timeout parameter you set in the target: obviously a low-speed network could generate some comunication problems.
Bye
Riccardo

G505s slow CPU speed whilst charging.

This is terrible, by using CPUz i can see that, whilst the laptop is charging, the clock speed drops down to 900mhz and fluctautes between that and 1400mhz, this is shocking, i can hardly watch youtube videos or even post this thread, the lag and slowness is unbearable. When running on battery power the CPU speed shoots up to 2500mhz and stays there,it never seems to go to its turbo speed either. Please lenovo fix this problem as soon as you can, whilst charging, the laptop is unusabe, i cannot do anything on it.
FIX THIS PLEASE!
Solved!
Go to Solution.

hi grisleyt,
Thanks for posting!
Can you try opening, Control Panel / Hardware and Sound / Power Options.
On you preferred plan selected click on"Change Plan settings"
Now click on Change advanced power settings
Now go down to Processor power Management and Make sure both Plugged in and On battery are set to 100%
link to image
hit "Apply" then check the performance again.
Hope this helps,
Cheers!
image(s) >50k converted to the links
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Question CPU speed VS RAM speed

I am tweaking my new worstation.
I have an Asus p6t ws professional. I7 960
24 G DDR3 tripple channel ram (Patriot Level 7 Viper II)
I am new to overclocking and I up to now I don't know how to solve this propblem.
If I overclock the CPU by putting the BCLK frenquency to 160, with default multiplier at 25, I clock 4.07
But, when I check the speed of my RAM with CPU-Z, I get a clock of 490 (!!!) so time two 980 (not even the 533 x2 to 1066)
If I put my bios to XMP mode I get my ram to 1600, but my cpu is about 3.4 (close to normal 3.2)
How can I OC to 4.0 with 24 G RAM at 1600?
The mother board manual say it acccept 1600 RAM but (OC) And THEY SAY THAT iNTEL SPECIFICATION, IN xmp mode, DDR3-1600 are supported for one DIMM per channel only (does that mean I cn only put 16 gig in channel A,B and C If I want 1600 OR 24G butr at a lower clock around 1066?
IF I am stucked in making choices and can't have it all (CPU 4.0 and 24D RAM-1600), WICH IS THE MOST IMPORTANT: CPU SPEED OR RAM SPEED?
I mostly edit P2 and wil be editing red and filmstock transfered.

Using a Gigabyte MB and cooling with water my i7-950 is rock stable at 4.3 with 24GB of 1600 G Skill RAM running at 1624; I have CPU turbo disabled and RAM XMP enabled and running at 1.5 volts.
Based on my clocks (BCLK 203, CPU 21, turbo off, QPI 36, MEM 8, and Uncore 16), I would suggest trying the following to reach 4.0 with your 1600 rated RAM:
BCLK 190
CPU 21
turbo off
QPI 36
MEM 8
Uncore 16
If that is not stable for your Asus, Try lowering BCLK until go get something that is. These settings would put your RAM at 1520 which would certainly be close to their maximum potential.
OC'ing can be time consuming; if this "formula" does not work for your system, then you really do need to go with the tried and true methodical approach.
Regarding which is more important for PPro I would say CPU speed is much more significant than RAM speed based on runs that making with Harm and Bill's ever so useful PPBM5 benchmark along my journey.
On another note, Cristobal on this forum informed me about "INTELBURN TEST" (Google it), which was a more rigerous torture test for stability than the ones that most people use (memtest, 3DMark, wPrime, etc.).
Good luck and do report back what works best for you in the end; it would be nice to report how your drives are set up too along with your PPBM5 results as well.
Jim

Cpu speed is clocked down during heavy use (msi x79a-gd45) ?

Hi
I overclocked my cpu, intel i7 3930K, 32 gb ram win 7 on msi x79a-gd45
cpu base clock : 100
adjust cpu ratio 42
intel turbo disabled
dram freq @1600
cpu core temp 1.290
hyper thread enabled
Everything else is auto
This pc is running at 4.2 in general but when I do render type heavy cpu rendering cpu speed starts going down to 2900, they oscillate betwen 4200 and 2900/2700. I am trying to get it start around 4000. TO me it is kind of pointless that the cpu would clock down when I need them not too. I do not mind if they are clocked down when they are not in use.
I have 750 W with corsair hydro h60
I asked this issue before but I was not able to resolve. I am hoping that someone else might be able to help me out here .
thanks

Quote from: PirateDog on 07-December-13, 17:08:38
Yes, with a Turbo OC on the Core Ratios (set them all to 44X) in CPU Features sub menu plus the CPU V. and CPU Ratio must both be set to Auto. EIST and C1E enabled. Enhanced Turbo enabled. Overspeed Protection disabled.
If the mainboard also has the VDroop option, then set it to 100%. Have you tried the CPU Ratio OC at 44X with the CPU V. in Auto already? If it is stable, then no need to try the Turbo method of OC. With CPU V. in Auto, you can enable EIST and C1E and get power saving features to work. CPU V. must be in Auto for the voltage to decrease at low use or idle (33C).
Hi PirateDog
Thanks for your reply, very helpful
So I now have
Cpu base 100
ratio 44
EIST enabled (intel turbo disabled, enhanced turbo disabled)
Dram auto
Cpu Core V auto
C1E Enabled
C-State disabled
Cpu Phase Control Disabled
VDroop +%100
This setup seemed to push my average cpu temps by around 7C degrees, so I am around 64C if all are at max. I am not sure if this issue is from another place but worth mentioning. I am not sure if this is still in the good range. On the other hand this setup seems to lower my average idle temps couple degrees.
Before I was using
Cpu base 100
ratio 44 Cpu Core V auto
Dram 1600
and everything else was either disabled or set to auto
Any further recommendations?
thanks

Wrong cpu speed

I bought a 12" 1ghz Powerbook in 2003.
It worked fine until a couple of weeks ago when I had to change the HD. Since then, my cpu speed is no longer 1 ghz but 867 nhz, which is as of the previous model...
any help !?
Jules

ok so the pram didn't work, and I don't know how to access to the open firmware.
But is there a way to know for sure at which speed my cpu is set, because if it's just an info issue, I don't realy care about it.
and also I forgot, my fan is always on when I start my computer, and never stops since the hd replacement..
Jules

Re: helix CPU speed stuck at low clock speed

Admin edit - Reorganizing this thread slightly as we are actively investigating the symptoms being discussed here. Several different low end clock speeds of 600-800mhz are being reported capped under a variety of circumstances - sometimes cold boot, sometimes after suspend / resume or dock / undock
motku wrote:
Same here (helix ci7), after suspend and wakeup when CPU slows down ist get stuck at 750MHz and dose not recover untill reboot.
Before the BIOS update I could unplug the AC adapter and work with full speed on battery.
I have the exact same issue. It is quite annoying.
Solved!
Go to Solution.

Mark, theres more.
I found a "pseudo workaround" of this problem and hope this could lead to the real workaround.
What helped - installing win7, lenovo power manager, change power plan to other and change back to previous)
I tried to do some research and what i found:
In normal Lenovo power manager wheres 2 options in power plan:
System perfomance (Maximum turbo, Turbo, Balanced, Low) (lets call it PERF) and Optimise fan control to (Maximize perfomance, Balance all parameters) (lets call it FCNTL.
In theory FCNTL must control only fans, like table of data cpu temperature/fan speed. But in reality it affects CPU speed.
Only way to make PC always select speed from lowest to highest is to set PERF=Maximum turbo or Turbo, FCNTL=Maximize perfomance.
Lets go through options how they really works in practice:
PERF
Maximum turbo and Turbo are equal, means highest speed for CPU with turbo boost. The level of turbo bust is always maximum, Turbo didnt mean "slow turbo boost".
Low - cpu always at lowest speed 800mhz - thats ok.
Balanced - this option works a little crazy. In some situations it means "maximum cpu till 63C", in some situations it means "lowest speed, temperature doesnt matter. Why is it working in different ways but in same settings i dont know.
In theory Balance is something like "from lowest cpu speed till normal cpu speed, no turbo boost", but it doesnt work like that at all.
FCNTL
Maximize perfomance - in theory it must be "try to keep CPU on lowest temp when high load"
In practice its like "Balanced in PERF" - logic is unknown.
Balanced - the same, logic is unknown.
Unknown really means, that when i, for example, setup PERF=Maximum turbo or turbo and FCNTL to Balanced, sometimes it works in full speed and sometimes not.
Maybe there is logic, but it tottaly unknown to users.
The bad thing is that theres no way i can set mode "always run cpu from lowest speed till highest speed without turbo boost, 800-1800mhz".
By the way, there is some error in Lenovo power manager - when i change options in power plan and click "apply", sometimes they a apply, and sometimes not. If not, i need to select other power plan, and then select the needed one back.
Now about how this all can happend. I'm not shure that i'm right, but logically it is:
In Lenovo power manager theres option called "Optimise fan control to". And, there is NO such option in real windows power plan, so, it can be only changed through Lenovo power manager. As i see, this option affects maximum cpu speed. So, lets say, if this option is "damaged" some way, theres no way it can be fixed in windows 8, because Lenovo power manager for windows 8 has too few options, and native windows power plan editor doesnt have this option at all. So, when i done "something" in Lenovo power manager for windows 8, it changed that setting and all ruined.
Sorry for my bad english once more, hope you can understand what am i trying to say. Looks like we have 1) an error in power manager for win8 and 2) incorrect power option logic, or "specific" logic without a manual.
The strange thing, that in BIOS we have this options too. But changes in BIOS doesnt affect this at all.
P.S. by the way, when i got my helix, dock battery was having "wear level" = 1%. Now, after 6 days (battery info 5 cycles) it has "wear level" = 2%. Is it normal, or battery is bad?

K8T Neo-FIS2R V1.0, CPU Speed Problem

Hi, I got a Athlon64 3500+ (NewCastle) and K8T Neo-FIS2R V1.0 MotherBoard
Just downgrade my bios from 9.2 to 3.3 since the 9.2 bios does not show the correct +3v voltage in the core center and the website is recommending that old version of Athlon should use 3.xx bios.
But the problem occurs, the core center now shows the cpu speed is 1xx rpm and keep sending alarm. I use other software to check the fan speed and it is 2xxx rpm. The temp of the cpu is between 33 to 43 'C.The temp of the case stays at 42 'C. The voltage of the CPU is 1.52-1.53V. One time, somehow the temp of the cpu went up to 50'C but the fan is not turning faster to cool down the CPU. No matter what models (Cool&Quiet or User) I choose in the core center, it just did not go faster. Finally, I have set full speed of the fan in the core center to increase the speed of the fan.
My PSU is Enermax 450W, and I used 5V for my three case fans since they are really noise.
Any problems with my system or computer, or any recommemdation?
Sorry for my English, but I am doing my best.

Everest just has no readings that work for us. They never supported our board. None of the software gets a correct read on our 3.3v so no there is no answer. I have tried them all as have others. If reading the 3.3v is that important to you use a meter.
I have yet to ever trust Core Center. It lies. Keep in mind just how many MSI products it is used in. So far it has yet to be that accurate in any Via Based MSI product. Search the forum here for it. No one seems overjoyed with CC.

Maximum CPU speed?

What happens if I set 'maximum CPU speed' to 'highest' instead of 'adaptive'? If my laptop has a battery attached while also connected to AC, would setting it to the' highest' level of maximum CPU speed shorten my battery life? If setting it to 'highest' makes the CPU speed the fastest, what could be a reason for not setting it to highest when a laptop is connected to AC (as opposed to a battery, in which case setting it to 'highest' will shorten the battery lasting time). Thanks.

joy2u,
Your processor will simply run at a its highest clock speed and give the best performance when set at "maximum". When left on adaptive, the processor will throttle down to a lower speed and only increase if more processing power is needed (running games, Photoshop, CAD software, etc.). This improves battery life by only using more power when necessary.
As far as wanting to set the CPU to adaptive while on battery or AC power, you would make the CPU last longer because it isn't working as hard, and thus, less voltage is applied, and less heat is created (both big enemies of processors). Additionally, you will reduce power consumption and lower your power bill, but the savings will probably be insignificant.
My Thinkpads: T42 (GPU failure), T60, W530
W530: Windows 7 Pro | i7-3720qm | FHD screen | 256gb Samsung 840 Pro SSD | 500GB Ultrabay HDD | 16gb Crucial RAM | Nvidia K1000m

Diamond Plus; Cell Menu CPU FSB Set at 250 x11 but Board Running 200.9 x14

I have FSB set at 250 with the CPU multiplier set at x11. Memory is set at an FSB / DRAM ratio of 1:1. The memory modules are in slots 1 and 2 (green / purple). While in the BIOS Cell Menu it is reporting Memory frequency at DDR500 and the CPU at a slight underclock. This agrees with the above settings. However, in BIOS / Standard CMOS Features / CPU Configuration, it shows the CPU running at 2816Mhz with a multiplier of x14. This is equal to the settings (200.9 x14) that are applied when "Load Optimized Defaults" is loaded and saved. All of the settings in the rest of BIOS setup are definitely set to Manual and the setting values as noted in the first sentence.
CPUZ is also reporting a FSB of 200 with a multiplier of x14. It's showing the memory as PC3200 and running at DDR400 which makes sense if FSB is really running at 200. Long story short, it's reporting everything at the stock settings as set by "Load Optimized Defaults". It is correctly showing the memory in dual channel and the command address rate at 1T. This is the latest version of CPUZ. I had an older version saved on CD. I tried this old version and it reported the same thing.
I have all of the dynamic overclocking options, wakeup options, cool n' quiet and automatic fan speed controls (except northbridge) disabled. If there's any other options that could throttle down the CPU I sure couldn't find them. Even if there were, my CPU is running atb 39C at idle so it shouldn't kick in any thermal throttling. When I flashed to the version 1.19 BIOS version at MSI Tech Support's direction to solve the "phantom modem" issue, I took the extreme route to clearing CMOS; powered down, removed or disconnected all the components, pressed the clear CMOS button, removed the battery for 30 minutes, pressed the clear CMOS button again, reinserted the battery, pressed the clear CMOS button yet again, reinstalled / reconnected the minimum required components, flashed the BIOS, cleared CMOS again, cleared nvram, loaded optimized defaults and saved, manually adjusted all the settings, reinstalled / reconnected the remaining components.
I'm at a loss to explain this. MSI Tech Support says they can't help me because this involves overclocking and they're not allowed to provide advice.
Anyone have any ideas as to what could be causing this?
Thanks in advance for any help provided.

I've been experimenting with different combinations of FSB / Multipliers / Memory dividers. My best performance is with the CPU at 250 x12 for 3.0 GHz, and memory still at 3-3-2-8, 1:1 and 1T. This is all at stock voltages and I'm not willing to risk frying anything by raising it even a little bit. It's running fast, smooth and cool. That's all I'm looking for so that's as far as I'm going to take it.
Here are a few reports from Everest:
OC:
CPU Properties:
CPU Type AMD Athlon 64 FX-57
CPU Alias San Diego S939
CPU Stepping SH-E4
CPUID CPU Name AMD Athlon(tm) 64 FX-57 Processor
CPUID Revision 00020F71h
CPU Speed:
CPU Clock 3000.0 MHz (original: 2800 MHz, overclock: 7%)
CPU Multiplier 12.0x
CPU FSB 250.0 MHz (original: 200 MHz, overclock: 25%)
Memory Bus 250.0 MHz
DRAM:FSB Ratio CPU/12
Chipset Properties:
Motherboard Chipset nVIDIA nForce4 SLI X16, AMD Hammer
Memory Timings 3-3-2-8 (CL-RCD-RP-RAS)
Command Rate (CR) 1T
SPD Memory Modules:
DIMM1: Muskin 991492 1 GB PC3200 DDR SDRAM (3.0-3-2-8 @ 200 MHz)
DIMM2: Muskin 991492 1 GB PC3200 DDR SDRAM (3.0-3-2-8 @ 200 MHz)
BIOS Properties:
System BIOS Date 03/21/06
Video BIOS Date 06/24/04
DMI BIOS Version 080012
Graphics Processor Properties:
Video Adapter nVIDIA GeForce 7800 GTX
GPU Code Name G70GTX (PCI Express x16 10DE / 0091, Rev A1)
GPU Clock (Geometric Domain) 275 MHz
GPU Clock (Shader Domain) 275 MHz
GPU Clock (ROP Domain) 275 MHz
Idle:
Sensor Properties:
Sensor Type Winbond W83627EHF/EHG (ISA A10h)
GPU Sensor Type Analog Devices ADT7473 (NV-I2C 2Eh)
Chassis Intrusion Detected Yes
Temperatures:
Motherboard 35 °C (95 °F)
CPU 32 °C (90 °F)
Aux 39 °C (102 °F)
GPU1: GPU 35 °C (95 °F)
GPU1: GPU Diode 43 °C (109 °F)
GPU1: GPU Ambient 37 °C (99 °F)
GPU2: GPU 30 °C (86 °F)
GPU2: GPU Diode 42 °C (108 °F)
GPU2: GPU Ambient 34 °C (93 °F)
Cooling Fans:
CPU 6027 RPM
Voltage Values:
CPU Core 1.41 V
Aux 2.98 V
+3.3 V 3.30 V
+5 V 5.54 V
+12 V 12.46 V
+5 V Standby 4.92 V
VBAT Battery 3.01 V
GPU1: GPU Vcc 3.26 V
GPU2: GPU Vcc 3.26 V
Load (Prime95):
Sensor Properties:
Sensor Type Winbond W83627EHF/EHG (ISA A10h)
GPU Sensor Type Analog Devices ADT7473 (NV-I2C 2Eh)
Chassis Intrusion Detected Yes
Temperatures:
Motherboard 37 °C (99 °F)
CPU 49 °C (120 °F)
Aux 40 °C (104 °F)
GPU1: GPU 35 °C (95 °F)
GPU1: GPU Diode 43 °C (109 °F)
GPU1: GPU Ambient 38 °C (100 °F)
GPU2: GPU 30 °C (86 °F)
GPU2: GPU Diode 42 °C (108 °F)
GPU2: GPU Ambient 34 °C (93 °F)
Cooling Fans:
CPU 5819 RPM
Voltage Values:
CPU Core 1.45 V
Aux 2.98 V
+3.3 V 3.28 V
+5 V 5.54 V
+12 V 12.46 V
+5 V Standby 4.92 V
VBAT Battery 2.98 V
GPU1: GPU Vcc 3.25 V
GPU2: GPU Vcc 3.26 V
I'm getting the same anomaly with the value for CPU Fan. That's the chipset fan speed for sure. It matches the BIOS reading and it's the only fan I have plugged into the mainboard. Everything else is running from a rheobus.
The NB temp on this mainboard is really exceptional. The NB on my old DFI SLI-DR routinely ran in the 48-49C range. I guess the MSI cooling solution is pretty efficient. One other thing though, I'm using Arctic Silencers on both of my graphics boards. The intake fan on the "slave" board is directly above one of the chipsets. That may be drawing an additional bit of heat off of the chipset.
As far as the voltage values, I'm getting the same skew with a different mainboard, BIOS and PSU so this looks like an Everest issue.
IMHO, if your machine isn't doing flakey things that can't be attributed to anything else then your PSU is adequate. If you do go with the Diamond Plus and SLI, I would suggest upgrading the PSU. It seems that the 1 kilowatt PSU's are all the rage now but in reality 700W is more than adequate. Adjustable potentiometers must be nice if you know what you're doing with them. I don't so I don't bother looking for that feature.
Hope this is helpful or at least of some interest.

MacBook CPU speed setting

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