I am also having this same issue.
Here are the details:
CPU: Core 2 Quad Q9650
Memory: 4x2GB (8GB) DDR2 800MHz 5-5-5-15 1.8V
HDD: Western Digital Velociraptor 300GB
Video: Integrated Q35
O/S: Windows XP x64 SP2, Windows Vista Business x64 RTM, Windows 7 Pro x64 RTM (I have tried all 3, same behavior)
I have disconnected all other major components, so only what I have listed above is connected.
With BIOS version 954: The system works correctly with 4x2GB of RAM. (The only problem is that the RAM gets extremely hot, at least hotter than similar systems in the office that use Intel G31/G33 chipsets)
With BIOS version 1126: The system is completely unstable using 4x2GB of RAM.
If I remove all the RAM and only install one of the 2GB memory modules, the system is stable, but with 4x2GB it is completely instable.
The instability manifests itself in the following manner:
- The system takes a few minutes to POST.
- The system takes a few extra minutes to boot the O/S.
- Once in the O/S desktop, response is very slow. I can sometimes watch the contents of windows drawing, it is so slow.
- Things are very unstable; it will occasionally reset in the middle of the boot sequence.
This is a software testing machine using by my work, and stability and reliability are very important. Any ideas? Please help me!
EDIT: If you need more specific info, I would be glad to provide it. I can even try all the other Intel BIOS versions to isolate the first version in which this problem appears. Please let me know if this would be helpful.
CPU: Intel(R) Core(TM)2 Duo CPU E6850 @ 3.00GHz
Mainboard: Intel DQ35JO
RAM: Kingston KVR800D2N6K2/4G Kit of 2 1.8V
Harddisk: Western DIgital RE-4
On board graphics
We managed to get this board running with 3 GByte RAM or less. Any more memory will slow it down like the other configurations described here.
A further update to my previous post.
I got a chance to test each BIOS version and here are the results:
BIOS 954: Good, works.
BIOS 991: Good, works.
BIOS 1016: Good, works.
BIOS 1056: FAIL!
So it seems like the problem was introduced in BIOS 1056.
So Intel, perhaps you could fix your BIOS so your board works with the memory configuration you have advertized?
Daniel, I tried it today and I wasnt able to replicate the problem. I used Windows* Vista Ultimate 64 bit Service Pack 2, the Q6600 and 2 or 3 sticks of Kingston memory 800MHz 2GB each. I installed the operating system using only one stick of 2GB and it went smoothly, then I installed one and then 2 more sticks of memory and the system was working great.
I was using a newer BIOS version but I did a BIOS recovery to the 1056 to check on the issue.
The only other thing that I can think of is the motherboard revision, I have Dxxxxxx- 701.
At lest if someone gets in to this post, the fix should be to update the BIOS to the latest version.