1066 mhz RAM won't boot on Gigabyte GA-M750SLI-DS4 board

If i set the RAM to run at 1066 mhz in the bios, the computer won't
boot. It defaults to 800 mhz, and when I set it back, it works fine.
The mainboard is a Gigabyte GA-M750SLI-DS4, with a Quad AMD Phenom Black
Edition 9950 2600 MHz and 8 gb of OCZ Fatal1ty OCZ2F10662G. I know
about the problem with the board not running at 1066 without an AM2+
cpu, so that's not it. Could I be missing some bios setting other than
those in the memory clock (set to 5.33) section?

Thanks, Don

Don wrote:
> If i set the RAM to run at 1066 mhz in the bios, the computer won't
> boot. It defaults to 800 mhz, and when I set it back, it works fine.
> The mainboard is a Gigabyte GA-M750SLI-DS4, with a Quad AMD Phenom Black
> Edition 9950 2600 MHz and 8 gb of OCZ Fatal1ty OCZ2F10662G. I know
> about the problem with the board not running at 1066 without an AM2+
> cpu, so that's not it. Could I be missing some bios setting other than
> those in the memory clock (set to 5.33) section?
>
> Thanks, Don

http://www.gigabyte.com.tw/FileList/...750sli-ds4.pdf

"Note: Due to AMD AM2+ CPU limitation, DDR2 1066 is only supported by 1 dimm per channel."

What that means, is an AM2+ processor memory controller, can run two DIMMs
at DDR2-1066 and four DIMMs at DDR2-800. The processor has limited drive
capability for the memory address/command bus.

Paul

On Dec 11, 7:01*pm, Paul <nos...@needed.com> wrote:
> Don wrote:
> > If i set the RAM to run at 1066 mhz in the bios, the computer won't
> > boot. It defaults to 800 mhz, and when I set it back, it works fine.
> > The mainboard is a Gigabyte GA-M750SLI-DS4, with a Quad AMD Phenom Black
> > Edition 9950 2600 MHz and 8 gb of OCZ Fatal1ty OCZ2F10662G. *I know
> > about the problem with the board not running at 1066 without an AM2+
> > cpu, so that's not it. *Could I be missing some bios setting other than
> > those in the memory clock (set to 5.33) section?
>
> > Thanks, Don
>
> http://www.gigabyte.com.tw/FileList/...rboard_memory_...
>
> * *"Note: Due to AMD AM2+ CPU limitation, DDR2 1066 is only supported by 1 dimm per channel."
>
> What that means, is an AM2+ processor memory controller, can run two DIMMs
> at DDR2-1066 and four DIMMs at DDR2-800. The processor has limited drive
> capability for the memory address/command bus.
>
> * * Paul

Thanks Paul, mystery solved. It does run very nicely at 800, and I
couldn't find any 4Gb modules of DDR2 1066.

Don

Hey sell me the other two 2GB chips. My 9650 only has 2GB's LOL

"Don" <d****er{at}comcast{dot}net> wrote in message
news:494196d3$1@nap.mtholyoke.edu...
> If i set the RAM to run at 1066 mhz in the bios, the computer won't boot.
> It defaults to 800 mhz, and when I set it back, it works fine.
> The mainboard is a Gigabyte GA-M750SLI-DS4, with a Quad AMD Phenom Black
> Edition 9950 2600 MHz and 8 gb of OCZ Fatal1ty OCZ2F10662G. I know about
> the problem with the board not running at 1066 without an AM2+ cpu, so
> that's not it. Could I be missing some bios setting other than those in
> the memory clock (set to 5.33) section?
>
> Thanks, Don

Sorry, they work fine at 800 MHz, just not at 1066

Bill Brumbaugh wrote:
> Hey sell me the other two 2GB chips. My 9650 only has 2GB's LOL
>
> "Don" <d****er{at}comcast{dot}net> wrote in message
> news:494196d3$1@nap.mtholyoke.edu...
>> If i set the RAM to run at 1066 mhz in the bios, the computer won't
>> boot. It defaults to 800 mhz, and when I set it back, it works fine.
>> The mainboard is a Gigabyte GA-M750SLI-DS4, with a Quad AMD Phenom
>> Black Edition 9950 2600 MHz and 8 gb of OCZ Fatal1ty OCZ2F10662G. I
>> know about the problem with the board not running at 1066 without an
>> AM2+ cpu, so that's not it. Could I be missing some bios setting
>> other than those in the memory clock (set to 5.33) section?
>>
>> Thanks, Don
>