**Official DFI LanParty UT 790FX-M2R Review/Overclock/Guide Thread**

[keithlm]

C1 is Memory related.

BUT isn't C1 the last step in POST before the CPU becomes important/needed?

Could the CPU fail badly enough that the POST might not make it past the C1 error and into one of the CPU POST messages?

NOTE: I never verified if my DFI was bad or not. I RMA'ed it. But the Phenom is definitely bad in a different motherboard with two different sets of memory. (The 1066 memory has tested fine for a day including 2 passes of memtest. At 800 speeds at this time. No overclocking until everything has worked for a few days at stock.)

[KTE]

BUT isn't C1 the last step in POST before the CPU becomes important/needed?

Could the CPU fail badly enough that the POST might not make it past the C1 error and into one of the CPU POST messages?

AFAIK on AMD CPUs, its one of the last processes ->



So yeah, it can be bad BIOS, bad 1066 BIOS code, bad 1066 DIMM support or an IMC error. If you check the system power when you get the C1 error, the CPU is never fully started up, only around 5/6th of it is starting up at most before it reboots/pauses. That would point to IMC failing to start up. IMC not being initialized is what MB MFGs told me that error is with Phenom, especially for my last 3. But like I told you, all of mine did show that problem brand new at one time or another - but when tried in another board, they booted fine. My new 9850 gave the same problem first time and now.
Only ever happens when I clear CMOS, switch off mains power or remove the power connection.
The day it boots, it will run perfectly fine again for months unless and until I do these procedures.

MSI and Abit have not been able to reproduce the problem internally. I've done so much testing and troubleshooting working this error out, 5000 Miss Universe contestents side by side on La Jolla's Black Beach [according to its rules ] would now only have an anaphrodisiac affect on me

Stability: casual daily use, doing everything without worry or caution including benching, stability tests and so on should all give no probelms, ever - that's stable for us. With Phenom the procedure is lengthier than anything I've used before though.

My last setting was 2800 fully Load/WISE stable for 3 days at 1.384v... then did a lot of messing and after 3 more days [planned], decided to test it again -> what a surpirse, it failed WISE stability even at 1.4v now
This is on a CPU which 3069MHz 1.48v load passes P95/AOD/EVEREST/OCCT/Sandra/Benchmark testing.

Thanks for the template Camp, its very helpful to me starting from scratch