new memory - clock/v changes

By Snuffy09 ·
i just installed new kingston hyper t1 4gb DDR2 1066 (PC2 8500) Dual memory (2.2 v).

my motherboard is GIGABYTE GA-MA78G-DS3HP

when i booted to xp pro it only sees the memory as ddr2 800 pc2 6400

i tried changing my Memory multiplier to x5.5 to make it 1066 in bios but the OS still only sees the memory as 800mhz.

my processor is AMD Athlon 64 X2 7750 Kuma 2.7GHz

im guessing i need to change the clocks/voltages on my other devices too but im not sure what i should change or what values i should change them to. any help would be great

Thank you!

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did you check the....

by ---TK--- In reply to new memory - clock/v chan ...

"memory support list"? http://www.gigabyte.com.tw/FileList/MemorySupport/motherboard_memory_ga-ma78g-ds3hp_rev.2.0.pdf
I would check it out... from what I could tell your memory wasn't on the supported list... which might be why XP isn't seeing it.

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i checked the list before the buy

by Snuffy09 In reply to did you check the....

but i have heard from others that the list is not very accurate

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by ---TK--- In reply to i checked the list before ...

When you placed the RAM in did you reset the BIOS? unplug the PS from the wall, purge the power (holding the power button in while disconnected from the wall), reset the BIOS to factory defaults (by using the jumper)? I might give that a shot... The system might pick it up and set it up automatically...

Also there have been a few BIOS updates, last release was 06/08/09... I would also run that update... but remember if you do it and something F***s up your left with a dead board.

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by Snuffy09 In reply to hm...

flashing the bios with the last update it ws one of the first things i did. It didnt do anything for the memory.

I did not try using the jumper to reset the bios i just picked load defaults from the bios menu. but i will try the jumper as well.

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"Due to AMD AM2+ CPU Limitation ..." -

by OldER Mycroft In reply to new memory - clock/v chan ...

"DDR2 1066 is only supported by 1 DIMM per channel."


Dunno how you've configured yours though.

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So what is the FSB of your CPU then?

by OH Smeg Moderator In reply to new memory - clock/v chan ...

In Dual Chanel Mode your RAM can not exceed more than 50% of the FSB of the CPU fitted.

Just because you have RAM rated to 1066 doesn't mean that the CPU/M'Board can support it to that speed. It just means that it is suitable for your system.


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I believe its 3600MHz HyperTransports

by Snuffy09 In reply to So what is the FSB of you ...

I understand that some memory is sent out to run at a "safe speed" and you have to do the configuring/bios tweaks?

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While some Memory is set to run at safe Speeds

by OH Smeg Moderator In reply to I believe its 3600MHz Hyp ...

Or more correctly the BIOS int he computer is set that way here you need to look at the Supported FSB of the CPU that the M'Board Supports and the Actual FSB of the CPU.

Most M'Boards will support several different CPU's with Different FSB and then you need to chose the RAM for your CPU to get the best performance possible.

But if the CPU is correctly set up you Can Not run the RAM Speed to a faster value than the FSB of the CPU as that is what you appear to be asking here.

So while the M'Board may support the faster speed with a different CPU unless you wish to change the CPU to one with a faster FSB the RAM will not run at the higher speed.


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I must have been exhausted when I posted the above

by OH Smeg Moderator In reply to While some Memory is set ...

Basically what I was trying to say is if the CPU is correctly identified the RAM is running at the correct speed for that CPU.


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