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 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" dsluter{at}comcast{dot}net wrote in message
...
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" dsluter{at}comcast{dot}net wrote in message
...
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