Upgrade to DDR2 800 RAM

This may be a silly question (for which apologies) but I did search and could not find an immediately obvious answer...in order to take advantage of the 800 Mhz FSB in the new iMacs, could I replace the DDR2 667 Mhz RAM modules with DDR 800 Mhz RAM modules in the current model iMac?
thanks in advance for any responses...
Raf

Dear DrSeuss
You can definitely purchase your own memory and it will definitely NOT void your warranty as incorrectly suggested by Zerimar. Here are Apple's instructions for the current aluminium iMac:
http://docs.info.apple.com/article.html?artnum=306204
Raf

Similar Messages

DDR2-800 on MacBook 5,2 (Early 2009)

Hi,
I just installed 4 GB of DDR2-800 RAM even though the manual says I have to install DDR2-667.
I heard a lot that Apple limits otherwise capable hardware to reject upgrade options different to those specified in the manual.
Will the computer rebel against it? What can I expect?

Hi stedman1,
Like I said, the computer does start-up, recognizes the memory as DDR2-800 and passed the Apple Hardware Test extended test.
My question is: Will it cease to work after some time? Will it work more slowly than when I had the 667's in?
I was hoping to get a little performance boost because of the 1066 MB/s difference in peak transfer rate between the two...

HT1651 I have a 2008 mac book....with 1GB 667hz DDR2 RAM 1GB each....I want to upgrade it with DDR3 Rams 2GB each, it is possible?

I have a 2008 mac book....with 1GB 667hz DDR2 RAM 1GB each....I want to upgrade it with DDR3 Rams 2GB each, it is possible?

No, the two RAM types are different, and the architecture has to specifically be able to interface with it. You can upgrade to 2x2GB of DDR2 memory, for a total of 4GB.

Upgrade Satellite P 105 to 2x2GB DDR2 800 MHZ

Hello everybody,
I need to ask if i upgrade my bios to the latest version; can i install 2x2gb DDR2 800 MHZ instead the 667 MHZ?
Thank you

Dear DrSeuss
You can definitely purchase your own memory and it will definitely NOT void your warranty as incorrectly suggested by Zerimar. Here are Apple's instructions for the current aluminium iMac:
http://docs.info.apple.com/article.html?artnum=306204
Raf

Replacing the PC2-5300 DDR2 667 MHz RAM with the PC2-6400 DDR2 800 MHz RAM?

Good afternoon,
I'm currently thinking about purchasing a MacBook Pro 4,1-2.5 GHz Intel Core 2 Duo that has 2 GB of the PC2-5300 DDR2 667 MHz of RAM, but has a BUS speed of 800 MHz. If I do purchase this machine I plan on replacing the 2 GB of memory with 4 GB, but I was wondering if anyone knows if it would be possible to put in the PC2-6400 DDR2 800 MHz model of RAM instead of the PC2-5300 DDR2 667 MHz model of RAM? The reason why I'm asking this question is because the BUS speed in this "early" 2008 MacBook Pro model is at 800 MHz, which is why I'm thinking the PC2-6400 800 MHz of RAM might work. I would appreciate any helpful and productive insights to my question that anyone could give me. Thank you.
AMMOCAN

No. It only uses PC2-5300. http://www.newegg.com/Product/Product.aspx?Item=N82E16820231135
G.SKILL Kit 39.99 shipped.

P965 Platinum 4GB RAM - where's my DDR2-800 ???

The manual states you can run DDR2-800 with 4GB RAM. Using some top notch G.Skill memory that got awesome
reviews on newegg. But it just won't run at DDR2-800. Won't even boot, beep, or anything. I have 4x 1GB modules.
When they say 4GB at DDR2-800, do they mean 2x 2GB modules or something? Oh, and I did check all the latencies
and voltages. Worked like a charm with just 2x 1GB modules. Overclocked that to DDR2-1033 with just an additional
0.1V overvolt, and no change to latencies. ???

I haven't tried doing the mix and match thing. I should try that. I'll do it tonight when I get home. The modules are G.Skill model F2-6400PHU2-2GBHZ. Search newegg for N82E16820231065. My bios version is the latest 1.4. The specified voltage for these modules is 2.1V. So I overvolted them to 2.2V previously. During this test, the system is NOT overclocked or overvolted. System will boot with DDR2-667 and seems to be stable. But the manuals says that is only when you have 8GB of ram. Again, DDR2-800 just doesn't work. Power light comes on and fans spin, but other than that, system appears to be completely dead. Monitors won't even come out of standby.

Detection ram ddr2 800

hello
this is my config
q6600
msi p45 neo-f
ddr2 800 mhz kingston dual channel
dd samsung 500 go sata
my problem : the maindboard detect ddr2 memory at a bad frequency
the bios shows that the memory at a frequency of 667 MHz instead of 800 mhz
thank you for your help

The BIOS reads the SPD-Profiles from the SPD-Chips of your memory modules. If there is no table for 400 MHz (DDR2-800) the BIOS cannot automatically detect the modules as DDR2-800 sticks. Your modules probably are DDR2-667 modules with a manufacturer's "permission" to overclock them to DDR2-800 speed. Check the Kingston Datasheet for those memory sticks to know the recommended voltage & Timings to overlock the modules and then manually overclock your memory using these settings.

Satellite Pro U300-143 Ram DDR2 800 supported?

Hello, I'm new of the forum.
Someone know if it's possible to use DDR2 800 to replace old 667?
The bus of the mainboard is also going at 800.
Thank you.

Hi
It makes no sense to use faster modules if the chipset would not support the FSB speed of 800Mhz. the FSB would slow down the memory speed to the same speed which is supported by front side bus.
I recommend checking you chipset. Then you will know, what FSB speed is supported.
If FSB would support 800Mhz, then you can use such modules.

Can 915G Combo support DDR2-800 ?

Hey ~~every1
My Motherboard is 915G Combo MS-7058 BIOS ver 1.6 which support both DDR1 & DDR2. Now i just consider to upgrade DDR2 Module. Can My Motherboard support the latest DDR2 667 or 800 ? There is a news that Infineon will start to produce DDR2-800 in June that 512MB DDR2-800 will be price at $93.
Here is Comp Spec
MSI 915G Combo MS-7058 BIOS ver 1.6
LGA775 Intel 540 Pentium 4 3.2Ghz
Kingston 512MB DDR400(Single Channel)
40 HDD Samsung (PATA-Spinpoint)
SW-252B Samsung Writer
Prolink V.92 Modem
PowerSupply 480W (20 Pin)

The ram should run OK, just not at it's maximum speed. For you CPU the optimum speed is DDR400.
I have my doubts that DDR2 800 will be available for under $100, but I have been wrong before
Do you intend on buying two sticks or one? If only one, stick with what you have now. If two I think you need to decide if what you are purchasing will perform any better than buying for more stick of DDR 400. Performance wise I don't think so.

K9A Platinum and 4GB DDR2-800

I'm a major MSI fan and have been for a long time. My computers (even my customer's) are MSI boards.
Recently, I upgraded my motherboard, ram and processor to the new AM2 core (ok, not really new, but w/e). I have the following items:
MSI K9A Platinum
4GB DDR2 800 (2x2GB) G.Skill 5-5-5-15
Athlon X2 5200+ Windsor 65w w/2x1MB cache
2x ATI Radeon x1650 256 DDR2 (Crossfire'd)
1x 200GB SATA2
1x 300GB SATA2
2x 500GB SATA2
My previous system had:
MSI K8N Neo-4F
4x 1GB Kingston DDR 400
Athlon X2 4800+
Ok. So heres my problem:
I installed each 2GB stick into slot 1 to verify they work and I got all 2GB. Shut down and installed each 2GB at each channel (DIMM1 and DIMM3) and BIOS reports 2544MB total. I look in BIOS and it says Physical Memory = 4096MB, Usable Memory = 2544MB. (This is before I even installed windows.) So, I tried to see if windows would report differently and after installing, it reported the same 2.48GB of ram. Now I know that Windows 32-bit can only go up to 3.2GB and I have no problem with that. My previous setup reported all 4GB of ram... so whats different about this board that it doesn't use all the memory available?
If this is an issue with the Processor, then let me know. I paid for 4GB, not 2.5GB. I expected at most 3.2GB.
And no. I won't go Vista. And Windows x64 has little to no support for a lot of what I do/have. So I won't use it either.
Thanks for your help in advance.

@ BOSSKILLER:
I've done the single and dual vga test. I even placed the ram in single channel mode and it did the same.
@ Bas:
Its default. I'll paste it here.
Code: [Select]
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect /usepmtimer
Thanks for your responses so far.
Just for record, here is the RAM information taken from PC Wizard 2007 (From the makers of CPU-Z):
FYI: In the ram size, 2 ranks, 8 banks means its a double sided chip. 2 sides (1 rank per side), 8 chips (1 bank per chip) per side.
Code: [Select]
Information SPD EEPROM (DIMM0) :
Manufacturer : G Skill
Part Number : F2-6400CL5-2GBPQ
Serial Number : Unspecified
Type : DDR2-SDRAM PC2-6400 (399 MHz)
Format : Regular UDIMM (133.35 x 3)
Size : 2048 MB (2 ranks, 8 banks)
Module Buffered : No
Module Registered : No
Module EPP : No
Width : 64-bit
Error Correction Capability : No
Max. Burst Length : 0
Refresh : Reduced (.5x)7.8 µs, Self Refresh
Voltage : SSTL 1.8v
Prefetch Buffer : 4-bit
Manufacture : Week 0 of 2000
Supported Frequencies : 266 MHz, 400 MHz
CAS Latency (tCL) : 4 clocks @266 MHz, 5 clocks @400 MHz
RAS to CAS (tRCD) : 4 clocks @266 MHz, 5 clocks @400 MHz
RAS Precharge (tRP) : 4 clocks @266 MHz, 5 clocks @400 MHz
Cycle Time (tRAS) : 10 clocks @266 MHz, 15 clocks @400 MHz
Min TRC : 16 clocks @266 MHz, 23 clocks @400 MHz

I have new memory modules, 2x2 2GB DDR2 --800 SO DIMM0 to install in I-Mac early2008 ,currently with 1 GB DDR2 SDRAM. How do I find the memory slots ? I have the 4GB replacement modules from Crucial and general instr's., not specific to I-Mac.

I have new memory modules, 2x2 2GB DDR2 --800 SODIMM MAC to install into I-Mac early2008 ,currently with 1 GB DDR2 SDRAM. How do I find the memory slots ? I have the 4GB replacement modules from Crucial and general instr's., not specific to I-Mac.

https://www.ifixit.com/Guide/iMac+Intel+24-Inch+EMC+2111+RAM+Replacement/5196

Qosmio G30-102 - Can I install Kingston DDR2-667 RAM insted DDR2-533 RAM?

Hi
I've got a Qosmio G30 102 and I wanted to upgrade my RAM to a total of 4GB (currently I've got 2GB installed with specifications of PC2-4300 DDR2 (533MHz)) . So I've been searching for RAM and I wanted to know would it be possible for me to install.
*Kingston Technology - 2GB PC2 5300 DDR2 667MHz 200pin Memory SODIMM*. Would this work correctly and if so would it be better than getting a (*1GB) Memory PC2-4300 DDR2 (533MHz)* i.e. the standard RAM installed on my Qosmio???
Thanks in advance for th answers
Mo

Hi!
For upgrading RAM on my notebook I have used Kingston DDR2-667 and it works without any problems! :)
So you can use this Kingston module too but I assume that it will only run on 533 MHz speed due the FSB limitation of the CPU. The FSB speed you can check with a hardware information tool like Everest or PC Wizard 2008 for example.
As far as I know the notebook can be upgraded to 4GB maximum RAM.
Bye

P965 Neo support Aeneon 1GB DDR2 800 module???

HI there, i got a MSI P965 New mobo with me... currently running on 1 GB Kingston DDR2 667 Mhz... planning to upgrade to 2 x 1GB Aeneon DDR2 800 Modules... does tis mobo support it??? coz in the manual it stated 1GB DDR2 800 not supported... thanks for expert advice

Hello downcast,
Quote
coz in the manual it stated 1GB DDR2 800 not supported
If I am not mistaken, this statement is no longer part of the manual. At least I was not able to find it in the latest manual on the product page:
http://global.msi.com.tw/index.php?func=downloaddetail&type=manual&maincat_no=1&prod_no=265
In any case: The limitation it mentions do not refer to the memory capacity of a given module (1 GigaByte), but to the implementation/organisation of chips on that module.
Compare the datasheets of the following corsair modules for example:
TWIN2X1024 - 6400 C4
--> http://www.corsair.com/_datasheets/TWIN2X1024-6400C4.pdf
Quote
Implemented using 64M x 8 DDR2 SDRAMs [64x8 = 512 Mbit].
The limitation only applys, if you are using memory modules whose capacity is "implemented using 128M x 8 SDRAMs [128x8=1024 Mbit= 1 GBit].
As long as the actual chips on your 1-GByte-modules are organized as 64M x 8, you should have no problem @800 MHz.

Can I use DDR2/667 ram in a machine wants DDR2/533 ram?

I searched all over these forums, googled my eyes out, read the dev note for my machine and could not find a definitive answer...
The scenario is this: I have a PowerMac G5 (Late 2005) M9590LL/A, that is spec'd for DDR2/533 or PC2-4200.
I have a friend who just bought a 24" Intel iMac and upgraded the ram to 2 GB, thus he has 2 pieces of 512 mb DDR2/667 that are unused.
He will sell them to me at a very good price. Will they work in my machine? Can you use FASTER ram and will it clock down to the proper speed in a machine that is looking for slower ram?
Right now in almost all places online the DDR2/533 chips are MORE expensive than the DDR2/667 chips.
Right now my machine still has the stock of 512 mb of DDR2/533 ram (2 pieces of 256 mb).
Another friend told me to just put the chips in and see if they will work, I do not want to do this if there is some minor voltage difference that will either damage the motherboard or the DDR2/667 chips or both.
I know in the PeeCee world, you can use PC133 ram in systems that need PC100, and DDR/333 ram in systems that need DDR/266, and likewise DDR/400 in systems that are looking for DDR/333, but I remember reading that DDR2 ram is more sensitive to BUS speed and voltage than DDR(1) ram.
Any ideas?
Please help me :>
Thanks!
Dual-Core 2.0 ghz -M9590LL/A Mac OS X (10.4.8)

Welcome to Apple Discussions!
Even if you found a similar form factor module with a
higher spec than Apple's official, I would not put it
in the machine. Mac OS X can be very particular
about the kind of RAM that is installed, and panic if
the wrong kind is installed, or cause problems such
as unexpectedly quitting applications. Follow the
specs to the letter. See my FAQ:
http://www.macmaps.com/Macosxspeed.html#RAM
So you are basically saying that higher-clocked ram will not spec down to run slower?
Thanks for the info. I will give a good read to the link here to your FAQ.
:>

DDR2 667 shows up as DDR2 800 for some reason,,

Hi all,
My "problem" is the following..
I just bought myself 2 new Kingston 2GB DDR2 667 memory modules. Thus expanding the memory of my macbook to 4GB's of ddr2 667. Now when i enter the system specs @ " About this mac" the system tells me i am actualy running 4Gb's of DDR2 800 mhz memory..
I thought the white MB881M/n macbook didnt support 800mhz memory..
Now my question is:
Would it be wise to buy 800mhz ddr2 and use THAT in stead of using the 667mhz memory wich the machine is obviously overclocking.
And IF the machine is actualy overclocking the current memory, could it be harmfull? Will it actualy be faster at 800 then at 667? Is the machine actualy overclocking the memory, or is it just a bug in the system showing 800mhz in stead of 667?
I thought the macbook i have couldnt support 800mhz but if for some reason it can i think it would be "wise" to put the "real deal" 800mhz in it..
Cheers
Message was edited by: Jarno Hofman

Kappy wrote:
Well, OS X has no built-in capability to overclock RAM. Doing so requires overclocking the bus and that would require special software (I don't think any such software exists for Intel Macs.)
The documentation I have even on the Early 2009 White Macbook specifies DDR2-667 MHz RAM. I don't know why System Profiler is reporting 800 MHz.
Here's my (multi-part) theory, and it's from thinking about all the reports we've been hearing about older generation MacBooks and the newer white MacBooks.
People have been reporting that the lastest (early 2009) white MacBook does actually use PC2-6400/DDR2 800 memory and runs it at native speed. It's not actually "overclocking" anything; it's actually capable of it even if not documented by Apple. It's using the same NVIDIA chipset as the Unibody MacBooks, and they're capable of using PC3-8500/DDR3 1066, so it's not a stretch to believe that they're capable of using DDR2 800. Intel's latest chipsets are capable of using DDR2 or DDR3 modules, but the type is going to be limited to the physical socket type.
All reports are that correctly labelled PC2-6400/DDR2 800 memory doesn't work properly in any of the earlier MacBooks that specify PC2-5300/DDR2 667 except in cases where it's mixed with one slower speed module. One would think that the SPD should contain secondary settings, but that doesn't seem to help it work unless there's another slower speed module that forces the memory controller in the chipset to operate both at the same speed.
A few people who have purchased Kingston (especially the KVR "ValueRAM Series") DDR2 667 modules have reported similar incompatibility as with clearly labeled
DDR2 800 modules. Here's one report:
http://discussions.apple.com/message.jspa?messageID=9507719
My final theory is that these modules are sold by Kingston as DDR2 667 but are in fact DDR2 800 modules. This would A) cause the older MacBooks to not recognize it alone and B) cause the newer MacBooks to run it at a faster native speed.

Upgrade to DDR2 800 RAM

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