TWIN2X2048-8500C5D and Abit IX38-Quad GT no work @ 1066

[vwgolfman]

I have an Abit IX38-Quad GT Motherboard and TWIN2X2048-8500C5D modules.

 

I have upped my FSB to 333 giving me a clocked 6600GT Quad Core @ 3GHz (X9 multiplier).

 

I cannot get my memory to run at 1066MHz.

It runs at 816MHz @ 1.8V (default 272 FSB).

 

Now with my new FSB of 333 I can run the memory at 799MHz @ 1.8V (1:1.2 divider) but when I change the divider to give me 833MHz the RAM falls over.

I have changed the timings to 5-5-5-15 and I have tried increasing the RAM's voltage up to 2.4V (don't want to risk going higher) but still it does not like it.

 

Please can anybody offer any advice?

[RAM GUY]

Max supported Voltage would be 2.1 Volts for version 2.X and 2.2 Volts for version 1.3 and that is normal for that chipset or the I975 chipset. As you over clock the CPU the memory frequency will have to be more in sync with the CPU Frequency.

DDR2 Memory runs at:

DDR2-533 = 266 Clock Frequency 2 X 266 = DDR2 533

DDR2-667 = 333 Clock Frequency 2 X 333 = DDR2 667

DDR2-800 = 400 Clock Frequency 2 X 400 = DDR2 800

DDR2-1066 = 533Clock Frequency 2 X 533 = DDR2 1066

 

Intel CPU:

400 MHz = 100 MHz Clock Freq. 100 X 4 = 400 FSB

533 MHz = 133 MHz Clock Freq. 133 X 4 = 533 FSB

800 MHz = 200 MHz Clock Freq. 200 X 4 = 800 FSB

1066 MHz = 266 MHz Clock Freq. 266 x 4 = 1066 FSB

1333 MHz = 333 MHz Clock Freq. 333 X 4 = 1333 FSB.