Hi mate, I have the same specs as you, I am using corsair matched pair of 512's and get the same issues as you. I remove 1 simm and runs sweet?? maybe a bios update is needed.
I am stable now after working on it all weekend. <Knock on wood!!!>
This is what I did.
Flashed latest bios from ASUS website.
Bumped the ram to 2.8volts. 2:1 ratio with the CPU.
Dont know if this order matters, but this is exactly what I did in order.
Installed Windows XP. Fresh format of hard drive.
Installed onboard network drivers from ASUS CD.
Got internet working. Installed Windows SP2 and all updates.
Installed VIA 4 in 1 drivers. The drivers from VIA website not the CD.
Installed VIA SATA RAID drivers from CD.
Installed Promise drivers from CD.
Installed AMD 64 drivers from website.
Installed Audio drivers from ASUS website.
Then last I installed Video card drivers. Forceware 66.70.
I have this mobo with a +3500 @ 2.55ghz ..but I'm running dual channel OCZ PC4000 stuff on it (10x255 1:1) ... I have everthing set to auto in mem config and I always run my mem at 2.8v ..just an overclockers habit I guess
I have also have had experiences with other boards that enabling the 1T command in memory options cleared up some problems that were memory related or manually setting mem cas to 2
check voltages in bios and see if they read at or above what they are supposed to be
maybe bump voltage up one notch to your cpu ...I have had to do that in the past with some setups (even tho running at stock speeds)
first off ..are you having problems with anything else other then running prime? ..
is the corsair pc3200 stuff?
if so , then try running it at cas 2.5 ..if still you get errors , try with just one stick then the other ..if still get errors ..
try running memory at slower then spec speeds ..i.e, 166 instead of at 200
if still get errors , try lowering multiplyer on cpu one notch ..
these are just things to try to see if its memory or cpu causing the errors ..then if your able to determine wich ..then go from there
and if possible , try running the cpu and or memory in another mobo and see if still get errors ..
hopefully you'll find the source of your woes here
I have had similar problems with a A8V recently. My coarsair memory autos at 2-2-2-5, but the A64 3000+ has problems handling the aggressive timing. Try relaxing the memory just a bit. I am stable at 2-3-3-6 and prime runs flawlessly.
I am trying to build a new computer but it's not going well.
Asus A8V Delux Athalon 64 S939 REV 2
AMD Athalon 64 3800+ S939
Kingston HYPERX 1024MB Dual Channel kit PC3200 2X512MB
WD Caviar SE 120GB SATA 7200RPM 8.9MS 8MB
ANTEC 550W Power
Creative Sound Blaster Audigy 2 ZS
CD RW/DVD Combo
1.44 MB High Density Floppy Drive
Windows XP home-SP2
BFG 6800 GT OC AGP Video Card
The computer runs fine with a ATI 9600 pro, but will not work with the BFG, get characters flashing on the screen when BIOS is loading. and graphics is washed out after windows loads, sometimes blue screen, sometimes reboots. Have been in touch with Asus, BFG, Kingston, but so far no answers. Have loaded all the new drivers, bios, etc. I'm starting to think the video card is not compatible....have been told this a number of times.
From what I see here though, I'm encouraged...perhaps it's my memory timing,set as recommended by Kingston 2-2-3-6. Also have a question. Checked my motherboard power with Probe +12 at 10.88, +5 at 4.88, ans +3.3 at 2.88 volts. These numbers seem low to me? Could I have a power supply problem?
I had problems with running this board in dual channel mode with corsair.
I updated the bios to 108 and also changed the CAS to 2.5, a week later I am haveing no issues and all is sweet.
I had a cooling problem but now fixed, see picture lol