Have you checked the CMOS battery on the motherboard?

hmmmmm

Yes a PSU issue could be a culprit

You cant set everything to 'Auto' and run 400x9.. you still must set Vcore and memory voltage to run that.

What is the 12v, 3.3 and 5v readings in Windows when you run the full load OCCT test or when you run a 3DMark benchmark test?

Let me look up the PSU vic and run the numbers

I have to leave but will check this out first

Vic thats a MODULAR PSU meaning cables that are not solid wired

Check and make dang sure none of the connectors are lose and take a look for hot spots at those plugs too




The fact it just instantly reboot can suggest PSU but that does not mean its the problem. Does this reboot happen with a clock or any operation even unclocked under a load test?

If you can run lower and not reboot run the OCCT load test and see if 12v drops to 11.75 or less, or 3.3 drops to 2.8 or less and if so the PSU is definitely suspect


The PSU you have is only high current on the 12v3 and 12v4 output.. the other 2 are only 18A each.. look at how its connected in your system accordingly





This is why hard wired PSUs that have a SINGLE rail are so much better than modular units.. no matter what plug in use you get the FULL 12v amp ability when needed on single rail PSU's

In comparison the PCP&C 860 will deliver 64-70 peak amps on any 12v plug as it may need the power where modular 'RAILS' are totally limited to their rail and 'drop' from other power pulls

The Thermaltake has a regulaton of +/- 3% which I find quite high... PCP&C is 1% and it comes with a hard wired 6+8 pin PCIe for the newer cards without an adapter



Im not telling you its the PSU or getting another will solve the problem. I dont know what the problem is. If the system will run clocked at 1800 and test the memory clean in MEMTEST then I suspect its either PSU or another component failing when high power is asked for on ACPI initialazation (Windows boot)


You may need to do a process of elimination check to find out... motherboard is not out of the question either


gotta run

neg - always disable reboot on error.  BTW, just installed the Mushkin ram and setup the 400x9 that I had saved - which had worked - same reboot. So I've swapped memory and vid card with no success.

So the thought is:

is the PSU bad?
did the PSU just happen to go bad?
did the GTX 280 cause the PSU to go bad?

or is it something totally different.

Well - with my limited experience I'm beginning to bet on the mobo. Left 8800 and mushkin ram in - reset defaults in BIOS - so I'm running at 3.01 - reboot on prime95.

I was going to need one for a second system and I live three blocks from Frys. Bought a Corsair 1000W PSU. Decide to RMA the mobo anyway. WHen all that is done, if it STILL doesn't work - gotta be the CPU.  If it is the CPU, that I have to eat since I lapped the bugger.

There was a time, many moons ago when I knew my way around a scope & logic probe but that skill has long gone. Easier to RMA - found out it has a flaky main power connector anyway. If I just touch the main connector it will shut down the mobo. Connector is seated properly - could be bad trace.

Anyway, I'm going to forget computers for an evening and relax.

Thanx!