Memory frequency different to FSB

Hello,
i have KT600, i can set the memory frequency different to FSB.
what happens if my FSB runs at 200Mhz and my memory only at 166 mhz???
will there be much performance loss compared to 200/200 ?
thank you.
Oliver

i take your warning seriously. really, i do.
maybe you could explain me why my question is stupid.
thank you
or should i have to mention explicitly that my memory is not capable of running at 200mhz, only at 166, and my question, in less abstract manner would be "will i gain much performance buying 200mhz memory (ddr 400) when my fsb is at 200mhz".

Similar Messages

Memory frequency in overclocking?

I hope someone is willing to help me out as I am a complete beginner and very much out of my depth... having said that...
I'm looking to set up a very modest stable overclock... with next to no idea of what i'm doing.
I have an E4400 ms-7255 with 2 x 1gb RAM which runs at 333Mhz according to cpuz.
I haven't been able to find anything about 333Mhz RAM (if that IS indeed what i have - since i read it usually runs below its specs)
How does RAM frequency affect overclocking? Is it still possible/worthwhile or does the bandwidth limit it too much?
What settings would you recommend me attempting as a very safe attempt without having to flick the switch to reset my motherboard - and could you give me a bit of a run down/how to keeping in mind i'm less than leet.
Thanks so much
Samuel

Hello oscariouss,
the first basic thing you should try to get sorted before you get into overclocking is the difference between "real clock speeds" and "effective clock speeds" and also the inter-dependencies of different clocks and clock rates on an Intel System.
CPU-Z for example, shows you the "real" clock speed of your memory. Now, as we are talking about DDR memory modules, the effective clock speed is always twice the real clock speed. That is why "333 MHz" actually translates to DDR2-667 Mhz effectively. [DDR stands for "Double Data Rate" and this means that with each clock cycle, two transactions will take place (that is how you get the factor x2)]
Quote
I haven't been able to find anything about 333Mhz RAM (if that IS indeed what i have - since i read it usually runs below its specs)
You probably have DDR2-667 memory modules. To be absolutely sure about that, open your computer case and have a look at the memory modules themselves. The brand and model name is usually mentioned on some sort of sticker.
CPU-Z should also display information about the brand and model name of your memory modules. Have a look at the "SPD" Tab and see what it says in the top half. You can also make screenshot and post them here for comparison.
To overclock the system, the most basic operation is to simply raise the FSB Clock Speed in BIOS. For your current processor, the default FSB clock speed should be 200 MHz. CPU Frequency is always the product of FSB Clock Speed x Multiplier and that is why raising the FSB Frequency will automatically result in a higher CPU Frequency.
Keep in mind, that memory frequency is also tied to FSB Frequency. The relation between FSB Clock and memory clock is regulated via FSB/Memory Ratios that can be set in BIOS. If your FSB Clock speed is 200 MHz and memory clock speed (real) is 333 MHz, that means that FSB/Memory Ratio is set to 1:1.66 in BIOS (probably via an AUTO setting).
Now, if you raise FSB Clock Speed, memory clock speed will rise as well. If you would increase FSB Frequency to 210 MHz in BIOS and the FSB/Memory Ratio remains @1:1.66, memory clock speed will be forced to:
210 MHz x 1.66 = 348,6 MHz [or DDR2-697 MHz effectively]
Please also remember, that your board is a budget model whose VIA Chipset is not really a high-end/high-performance piece of hardware. Overclocking is not exactly what the designers had in mind here. That means that the overclocking potential will most likely be limited and the BIOS will probably lack specific OC relevant options that will help to reach higher clock speeds. That, of course, does not mean that you should not at least try to check what is possible, but you should not be disappointed when you find out that you are unable to stabilize the system above certain frequencies.
I don't know which options you have to influence memory clock speed (or more precisely FSB/Memory Ratio) in BIOS. Just have a look what options you have there and tell us here.

Memory Frequency?

I need to know how to set my memory Frequency to 800 mhz.

Quote from: Animex on 29-May-09, 02:45:14
Ram: OCZ2N800SR4GK 2gb sticks
Mobo: K9A2 PLatinum MSI
CPU: AMD Athlon 64 x2 Dual Core Processor 6000+
OS: Vista Ultimate 64
I have been trying for over a week to get windows to boot up with more then one stick of ram in. I called OCZ today and got the detailed specs of what I should be set at ...
6-5-5-18 2T 2.1V and 800mhz Dram freq. ( This is for 2 sets, 4 sticks of 2gb ram)
I can get the frequency to 802 with some messing around with the cpu settings. I tried to start with that and I get to the windows start screen where the little green loading bars go across before the windows userloggon screen and freezes for a second then reboots. After reboot then goes to Windows error repair.
Sorry forgot to stick that in there
Quote from: Animex on 29-May-09, 02:23:30
I need to know how to set my memory Frequency to 800 mhz.
I can get the frequency to 802 with some messing around with the cpu settings. I tried to start with that and I get to the windows start screen where the little green loading bars go across before the windows userloggon screen and freezes for a second then reboots. After reboot then goes to Windows error repair.
To run memory at 800, apply CPU reference clock to 213MHz {Can be named "FSB" in BIOS}
There is no warranty that will works as this is consider as OC.
Another combination is apply CPU MP to x14, that will underlock CPU to 2800MHz and memory freq. will be 800 too.
Quote
Ram: OCZ2N800SR4GK 2gb sticks
How many of them?

B75A-G43 low memory frequency

I have bough MSI B75A-G43 motherboard and four AMD AE34G1609U2-U memory modules (built by Patriot). In BIOS each of modules frequency shown as 1600, but memory frequency set to 1333, and no option 1600 provided in menu.
I have updated BIOS to latest version, but no success.
Is there some way to set memory frequency to 1600?

I see that, that is because it is AMD memory designed for AMD systems.
You will need to manually set the speed and timings although it SHOULD work even though it is not ment for intel.
Do you need help with this?
How to manually set the memory to it's spec (as stated on thier website)
Enter UEFI/Bios
Click OC
Goto DRAM FREQUENCY: AUTO and change this to 1600
(At this point you can try to save and exit, but i prefer to set the timings manually.)
Next:
Change the Dram Timing Mode to either Link or Unlink either one will work.
Click on advanced dram configuration
Set the timings as follows:
tCL: 9
tRCD:9
tRP:9
tRAS:24
save and exit
It is possible that these settings will not work, if your system won't boot after doing this, you will need to clear the cmos and start over.
>>Clear CMOS Guide<<

How to share memory between different VMs?

Hi, dear all!
I don't know if it is possible to share memory between different VMs. I know its easy for threads. Now my problem is that I want to start serveral applications which share only one copy of data, I don't know what's the right way to do that.
Thanx

They are some volume data for visualization. I want to
serveral rendering servers on a single machine, the
data size can be up to 1024*1024*1024 ( or even larger
I don't know if I HAVE TO use threads in order to
share the data, however, threads are not preemptive as
processes I think, is that true?
Not really sure what that has to do with it.
I believe the VMs for most common OSes use preemptive thread scheduling. I know windows does and I am rather certain that solaris/linux also do that.
A number of suggestions were made above for your problem. Memory mapped files allow multiple VMs if memory mapped files work for your VM/OS. Or you can use a single VM.
Given that your dataset is 1 gig or larger you might want to keep in mind the limitations of modern OSes. Windows for example will not normally allow any application to have a process space larger than 2 gigs. And on all OSes the VM heap limitations for 32-bit VMs are below 2 gigs by several hundred mega-bytes.

Memory locked at 400 FSB

How can use the Memory at 400 MHz FSB and the CPU at 420 FSB ?
Can I lock the Memory FSB, or set fix as the AGP Bus ?

Hi Treppendorf,
Getting your RAMs to run at 400MHz, just set your DRAM speed to 400MHz in BIOS, but try to o/c you system to 420FSB with DDR 400 MHz RAMs at stock latencies by SPD, one word, impossible...
Your system is already in a limited tight conditions when running on DDR 400 MHz and trying o/c without lowering latencies and speed, there is no way to o/c way up the FSB. You'll suffer alot of problems if you try to play with your system in such a manner...
All the Best... :D!!!

T520 - How to decrease memory frequency

Hello everyone,
I am lucky owner of T520 with Intel 2620M processor and 4Gb of memory onboard.
One day I bought memory kit Kingston "Hyper X" KHX1600C9S3P1K2/8G (2*4Gb) and thought "memory supports 1600 and 1333Mhz, and my laptop needs 1333, so it will select correct frequency automatically".
But there started problems - processor initiated new memory with frequency 1600Mhz, and all the system now works unstable. I have errors in Windows 7 memory test. By the way, I tried to check memory pieces apart each other, and in single mode they work fine. SO I think that processor's memory controller is loaded too much in 'dual channel'
So my question is - how can I decrease memory frequency on Lenovo T520 laptop? I was confused, but in BIOS there is no option to change frequencies like it is on Desktop PC...
Thanks.

hey akvamassa,
with regards to this, we would advice you to contact our support team via :
http://bit.ly/LNVsuppNum
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Memory Frequency-DRAM Clock (MHz)

Hi, I have a 875P Neo LSR with a P4 2.4GHz C 800MHz and 512 MB(1) Corsair XMS3200 OEM. The memory defaults to PC2700 as it was made befor the JDEC value was official. When I set the DRAM Frequency to 200MHz and reboot it stays at 200 MHz but the DRAM Clock (MHz) says it's at 333 (166MHz). So what is it running at?

Ok, there's many issues before when the PC3200s are out and many lab tests have proven that most 1st gen PC3200s are an o/c version of PC2700 unfortunately... Since what you have here is an OEM type, I dare not say much nor prove anything against it as there's no known date of production etc... to prove it's age...
If your CPU is a FSB800 (just to confirm again, no offence), it should support any true PC3200s compatible RAMs to the mobo without sweat. My suggestion is that to try borrowing any compatible PC3200 RAMs to the mobo and test it out. If the RAM was detected correctly as DDR400 in both DRAM and DDR Clock, then it'll prove what I've say above .

MOVED: A75MA G55 default memory frequency

This topic has been moved to Overclockers & Undervolting & Modding Corner.
https://forum-en.msi.com/index.php?topic=152729.0

yes that's true. memory doesnt support jedec at higher level than 666 Mhz. just XPM is 1k MHz
It is not such a big problem to owerlock the memory to get it work on that frequency, but more, what i dont understand is, why i cannot get change the NB frequency to this 993Mhz.
I tried to overlock it also, i have movedl bus speed to higher level, but also max cannot give me this number and of course computer is than very unstable ( problems to start etc. )
I would like to have this overlocked frequency supported also by mobo and CPU and it looks like i'm not able to get it in any way :D or better :(
maybe im missing some point here.

990FXA-GD80 can't adjust memory frequency

Hey, I have the 990FXA-GD80 motherboard, and I have an FX-8150 processor hooked up with it as well. I have the latest BIOS and driver utilities installed for the board, but every time I try and adjust my memory DRAM frequency to 1866, my BIOS/motherboard won't post at all.
I have Patriot Viper Xtreme DDR3 memory installed, no issues with it, but the BIOS shows the frequency to be set at "auto" and 1066 MHz. If I try and manually adjust the frequency and reload the computer with the changes, it doesn't post. Anybody know why this is and what I can do to fix it?

Hello! We would like to know some more about your system, if you'd be so kind. For example PSU, graphics card and how many sticks of memory, and I think processor temp according to BIOS would be interesting, too.
My thinking is, either the processor doesn't like your memory yet - and a new BIOS version is required - or the memory is not what you think it is nor what it claims to be.
Please try with a single stick if you haven't. Make sure you got right voltage for the memory; 1,65 volt if this is it http://www.thinkcomputers.org/patriot-viper-xtreme-division-2-ddr3-1866-8gb-dual-channel-memory-kit-review/

Adding memory of different sizes

I have a Mac Pro 8 core running with two 1GB memory sticks. I'd like to add additional memory. I'm looking at adding 4x2GB memory sticks. Is there any reason why I couldn't install the 2GB sticks and leave the 1GB sticks in the system for a total of 10GB of RAM? Some systems perform better if all the memory is of the same size and I'm not sure if that holds true for Mac hardware. This is my first Mac and my first memory upgrade so I wanted to make sure before I purchased anything. Right now, all I'm using the system for is Final Cut Studio 2.

You are suppose to move Riser B / DIMM 1 up to Riser A DIMM slot 2.
http://eshop.macsales.com/CustomizedPages/Framework.cfm?page=install_videos/macpro/macproquicksheet.html
http://eshop.macsales.com/Reviews/Framework.cfm?page=/Benchmarks/macproearly08ra m/article.html
http://www.barefeats.com/harper3.html

Memory speed differs from chip

I just purchased a used Mac Pro. The specs are as follows: Dual 6 core 2.4GHz Xeon. It came with 24 Gbs of memory but the model of the memory chip comes up in system report as: 1066MHz DDR3 ECC SDRAM. I checked the specs of the model number, and I do have the original box that has the same serial number on it so I'm pretty sure this is all legit. The specs for the memory chips listed for this machine are 1333MHz DDR3 ECC SDRAM. So I thought maybe they added the worng memory chip. Opened up and sure enough, I pulled out four 2Gb hynix chips withe following written on them: 2Gb 1Rx8 PC3-10600E-9-11-D1. And on the next line: HMT325U7CFR8C-H9 TO AB 1229. I'm not sure if these are or arent; 1333MHz. I looked at the other four 4Gb chips and the were very clearly listed as the 1333MHz DDR3 ECC SDRAM. So I removed what I thought were the offending chips and thought my memory would come up as 1333MHZ - it did not. It is still reading 1066MHz. I opened the amchine again and inspected each chip and they all read 1333MHz. What could be wrong here? The original specs on a base model of this machine absolutely call for 1333MHz - but they also said it comes with only 12Gbs of memory. This machine has 16 od the 1333MHz and 8 of I'm not sure. Does it need to be reset once it has used 1066MHz? I assume it down-clocked itself relative to the incorrect chips but now that they have been removed, why doesn't it read as it should? Any ideas? Thanks.

How can I find out if that's the Intel Xeon processor in this computer?
I just looked at EveryMac.com and this is what they post about my computer:
"The Mac Pro "Twelve Core" 2.4 (Mid-2012/Westmere) is powered by dual 2.4 GHz Six Core 32-nm Xeon E5645 (Westmere) processors with a dedicated 256k of level 2 cache for each core and 12 MB of "fully shared" level 3 cache per processor."
They go on to say: "By default, this model is configured with 12 GB of 1333 MHz DDR3 ECC SDRAM, a 1 TB (7200 RPM, 32 MB cache) 3Gb/s Serial ATA hard drive, an 18X dual-layer "SuperDrive" and an ATI Radeon HD 5770 graphics card with 1 GB of GDDR5 memory."
So as far as I can tell, this is the correct type of memory, could this processor just not run the memory at the higher clock speed?

Shared memory for different tasks?

Hi,
i call a rfc function module in threading mode (task):
CALL FUNCTION 'Z_TEST'
STARTING NEW TASK lv_taskname
DESTINATION lv_destination_func
destination is the same system (it has to be a rfc fm to use the "starting new task" clause).
Now i want to share memory (internal table, application log) beetween the program and the called function module 'Z_TEST', but i don't know how!? the application log and the global parameters in function group are not known in called function module 'Z_TEST'!!??

Hi,
Before calling the Z_TEST , please save the application log
using
BAL_DB_SAVE_PREPARE (prepare to save)
BAL_DB_SAVE (save)
then in Z_TEST use the handle to open log and then use
BAL_LOG_MSG_ADD (add messages)
May this will be help
a®

Memory frequency problem with K8n Neo4 Platinum

I have 4 banks of memory installed:
2 x 256 GEIL ddr400 Cl2 and 2 x 512 CORSAIR ddr440 cl2.5, total 1.5Gb ram.
They are in dual channel mode, but they run at 100hz and not at 200hz.
If in the bios i set the manual mode for the memory and set 200 hz, than after the reboot they are at 200 hz but in games like wow, css or others the system freezes.
If i let the auto mode for the memory, the system set them at 100 hz and so the problems disappear.
I see the value 100 or 200 hz in the "cell menu->ddr rate". This value is confirmed from cpuz.
How can i set them to 200hz without system freezes?

Quote from: JayBee on 13-December-05, 03:27:53
3 gigs (256x2 + 512x2) is an inherently unstable combination. While the system could boot that way, you are asking the memory controller on the cpu to negotiate too much when it must run one channel at one type of timing and the other channel at an other. Even under the best circumstances, you can boot that way but will fail memtest when system is stressed. Only stable way to use all 4 dimms slots is with 4 identical modules (same size, cas, etc, i.e., same everything). When it comes to mixing sizes like that (2x256 and 2x512), Intel can do it (memory controller is on the board) but AMD cannot (memory controller is on the processor).
Edit- mixing brands (Geil and Corsair) is an other reason why it has to fail. Intel could do it. AMD cannot.
Edit Edit- What 400 Watt psu is that? Note that you need 18 amps on +12 Volt rail minimum for Neo4. Does your psu have that? Just because the label says it, does not make it so. Check what brand it is.
The output at 12V is 18A

MSI P35 Plat / q6600 G0 overclocking attempt

Hello - this is my first time OC'ing in at least 5 years, and need some advice.
I guess manufacturers don't just let you change a multiplier anymore?? or is that an MSI thing?
q6600 G0
MSI P35 Platinum
4g Hynix 800
Silverstone 750 PSU
Duorb CPU cooler
case with 6 120ms w/straight through
I downloaded Everest system monitor and ran their queen CPU test as a benchmark fist, and noticed that at idle all of the core temps were at about 28C. I restarted and went into the bios. I turned on the option that enabled DOT for CPU and PCI (don't know if I should have,) and moved the FSB to 333. I restarted the system and went into the bios again to check for sure that the bios processor speed was 3.0 with a 9X, which it was.
I cam into windows, and the core temps according to Everest were still the same. I then went into Prime95 and chose the SmallFFT option on 4 threads. Almost immediatly the 4th thread failed with this message:
FATAL ERROR: Rounding was 0.5, expected less than 0.4
Hardware failure detected, consult stress.txt file.
The third followed suit very soon after. In the mean time, Everest showed the core temps getting up as high as 48-50. Within a minute of the second thread failure, I got a blue screen of death, and the computer restarted - to which I promptly loaded the optimized defaults back.
So my question is, was this because I'm not going to be able to reach 3.0 speed? Did I do something incorrectly? Does this indicate that the voltage needs to be raised? if so by how much? Are those temperatures bad? If someone could give me some advice I'd greatly appreciate it.
btw, I tried running 3 different software CPU clock changers, all returning errors about not being able to load drivers. I'm on vista enterprise 64, and ran the "fix" to turn off mandatory driver signature, but still had this problem.

Quote
I guess manufacturers don't just let you change a multiplier anymore??
Disable EIST in Cell Menu and you should be able to do so.
Quote
turned on the option that enabled DOT for CPU and PCI (don't know if I should have,)
Disable DOT if you are manually overclocking your system. DOT stands for "Dynamic Overclocking Technology". It is an overclocking on demand feature that will automatically raise clock speeds and voltage values. Automatic overclocking and manually overclocking exclude each other.
Clear CMOS with main A/C power cable removed from PSU and load "Optimized Defaults" in BIOS after that.
Keep DOT and Spread Spectrum disabled in Cell Menu at all times when you are overclocking your system. Keep the voltage values on AUTO for now and see how far you can get by just raising FSB Clock Speed (step by step). Pay attention to memory frequency when you raise FSB Clock Speed. Memory Frequency depends on FSB Clock speed and will increase with it. You have to adjust FSB/Memory Ratio in BIOS in relation to the FSB Clock range you use to keep memory frequency within specification (DDR2-800).

Memory frequency different to FSB

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