8800CL5D-4GBPI x 2 will not work

[DrAaron]

Hello,

I have 2 kits of F2-8800CL5D-4GBI (black). Separately, each kit works great at factory specs (1100 MHz, 1.9v, CL2, 5-5-5-15 timing). When I install both kits (so I have 4 DDR2 modules installed), I get numerous errors with memtest. I tried raising the NB voltage from 1.25 to 1.41, but that does not solve the problem. Can you please make some suggestions how I can use both kits together. My system details are below.

MB ? Abit IP35-pro
Processor ? Intel 6850
PSU ? 500w continuous
Video ? NVIDIA based 8600

Thanks,
Aaron Skewes

[DrAaron]

Anybody? I have been fooling around with this on and off for three days. I am nervous to raise the NB voltage too high and I cannot think of what else to try. Any suggestions will be appreciated.

Thank!

[DrAaron]

So I experimented a bit this morning.

I can get 1066MHz with DRAM voltage = 1.9v and NB voltage = 1.37v. For some reason, with the 4 sticks installed, I cannot go above 1066MHz with a tested maximum of DRAM at 2.0v and NB at 1.41v. Dare I try higher NB voltages or is there another tweak to try? I am not experianced in overvolting. This motherboard is going on 4 years old, but it has been rock-solid and was/is a kick-*** mobo.

Thanks.

[jh4db536]

maybe the ram Will go over 1066, however the problem might be that your MCH/NB doesn't like the fsb/ram ratio or the fsb is at a wall.

temps on the northbridge?

[DrAaron]

Temps are good (40-45c). Not sure what is a "wall", but I suspect my NB is weak, perhaps a faulty cap. The weird thing is that I can eaisly get 1200MHz from each kit seperately. Tech support seems unhelpful. I may need to just run it with 4GB. I have another 8GB box I can use when needed.

Would be nice to solve this.

Thanks,
-A

[jh4db536]

http://www.gskill.com/products.php?index=165&c1=1&c2=2
*G.Skill guarantees 2 Dimms dual channel operation would reach announced specification.

it's in the fine print, but it's not the end of the world. there are more effective tweaking methods to get better performance than increasing the bandwidth for example, clamping the timing. push it as high as you can go with 4 sticks and then clamp the timings to CL4

[GSKILL TECH]

If it is stable at DDR2-1066, then seems like it just needs more NB Voltage to reach DDR2-1100. Or like jh4db536 stated, lower timings to compensate.

Thank you
GSKILL TECH