Your problem coule be that your running the 3 channel memory with only 2 sticks of memory..
I don't have any spare ram so I haven't been able to try memory in a triple channel layout, but I tried a few things since the original post. An aftermarket heatsink was the cause of at least part of the problem. It wil now turn off ok, but occasionally it fails to boot.. no bios, just 00 on the motherboard's display. It hasn't done it lately so I'd say its tolerable.
Which is more likely: a ram compatability problem or a psu compatablity problem?
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You don't mention whether you have updated the BIOS. Ensure you are running the latest.
My guess would be a memory issue. This board seems picky on 1600mhz memory. Have you tried running it at 1333 or 1066 speed?
I would say this particular issue is very unlikely to be power supply related (if it helps, I'm running an Antec CP-1000 but it's way overkill for my needs).
Thanks for your reply. I flashed the BIOS to 765, which I think is the latest. I don't think it helped my problem though.
The problem is still there with memory set at 1066mhz and 1333mhz. I'm running it at 1333mhz 7,7,7,24 1.5125 V right now. Things are the same when left on "auto" memory settings. I haven't been able to get it stable on 1600mhz regardless of the timings.
My next move will be to get new ram, the question is which ones are known to be 100% supported. I searched
for this board on Kingston's site and decided that model KHX1333C7D3K3/6GX would do the job. Does it matter if its 1.65V?
I bought 6 x 2GB Kingston HyperX 1600MHz CL7 after being told by Kingston that it would be compatible; it was not. I was unable to get 1600MHz stable at anything faster than CL9. Also Kingston technical support was completely unhelpful.
CL9 was perfect. Just change the timings from 9-9-9 to 8-9-9 and the board would be completely unstable, even with significantly increased voltages on memory-related components (it's SUPPOSED to run at 7-8-7). I should note that 3 x 2GB *seemed* to work OK at CL7, but I did not test that for very long.
1.65V is fine, although the board does prefer 1.5V if you can find it.
It's starting to sound as though finding memory for this board is a bit hit and miss. I've never bought Kingston memory myself, its just that information on this board is scarse on memory manufacturer's sites. At the moment it does work, just not quite properly, so I don't want to pay for memory without knowing whether it's going to work better.
Sunfox... I take it that you have this board? Ever get it to play nice with your memory?
Yes, I've had the board for a month or so. Due to memory problems I spent a very long time troubleshooting and stress testing. I know that right now everything is rock solid stable with the memory at 1600MHz CL9 @ 1.51V. However it seems that anything faster than that is going to be tricky. There's another thread on here where someone was trying to get some Kingston 2000MHz memory running at rated speed, and was unable to.
Without someone to guarantee that something faster will work, I wouldn't even bother trying to find faster than 1600MHz CL9. Incidentally, if I were to re-purchase memory today, I would probably go with Corsair simply because they seem to (now) have some real-world experience with this board, and will provide recommendations on their user forum (they recommended me specific 3 x 4GB 1600MHz CL9, but since those were tall modules that would interfere with my heatsink, and I already had my Kingston working stable at that speed, I didn't bother to re-buy).
That should help me quite a bit. I see Corsair have a 4G 1600mhz 1.5v module that may be a viable option.
Thanks, I'm going to call this question answered.