I recently picked up an E5 1680 v3 Xeon (8c/16t 3.2ghz HWE) off eBay to play around with, and it has been nothing but a load of problems I can't wrap my head around.
Yesterday I rebuilt my water loop in a new case, swapped all my hardware over, and dropped in my new juicy J batch super-duper-xeon-edition of a 5960x. Right away, no POST. Everything came on, monitors woke up like something happened, then immediately gave the "no signal, entering standby" message. Tried power cycling, rebooting, nothing. Clear CMOS, nothing. Switch to the "backup BIOS" on my board, nothing. Try 1 stick of ram, nothing. Try a different kit of ram (some ddr2400 stuff), nothing.
Put my 5820k back in, boots right up.
Tonight I decided to give the Xeon another go before writing a disgruntled message to my friendly neighborhood eBay seller. Much to my shock and awe, after power cycling it once I had a POST screen!!! It seemed to have kept my 5820k voltage settings, so I left those alone, set the multipliers to auto, and made sure it could get into Windows. After I confirmed that worked, I went back and set 35x/35x CPU/cache multis, 1.25vcore, 1.2vcache, 1.9vccin as a starting point. Booted back into Windows, fired up Cinebench R20, and got to testing. 3.5ghz pass, 4ghz pass, 4.3ghz pass, 4.4ghz pass, 4.5ghz error. I figured 4.3ghz should be good, so I went to go set 43x in the BIOS and continue on stability testing at 4.3ghz. When trying to reboot, Windows slapped me in the face with a DRIVER_OVERRAN_STACK_BUFFER blue screen, but it was still able to reboot into BIOS.
Once in the BIOS, I set 43x CPU multiplier, hit save and exit, and that's all she wrote. I'm back where I was last night. It just will not POST. Tried power cycling, rebooting, clearing CMOS, nothing works, It's like the chip is dead.
My motherboard is an ASROCK X99 Extreme 4/3.1, which has always been very good about the whole "load default settings if the overclock you save doesn't POST" thing. I've never had to clear CMOS when overclocking my 5820k. Worst case it would POST after a reboot or power cycle and be back to default settings. So I have NO IDEA what is going on with this new CPU. Can it not run at 'default settings'? Can there be something wrong with the chip itself? Has anyone run into anything similar to this? I'm truly stumped by this one. Last night I was thinking it was just a dead CPU, but now I don't know what to think.
Intel i7 5820k @ 4.5ghz
ASRock X99 Extreme4/3.1
RTX 2080 Ti @ 2100/7950
16GB DDR2400 12-12-12-36
Samsung 970 EVO 1TB
EVGA Supernova 1600 T2
Walmart Great Value Distilled Water
Fractal R6 Blackout TG
LG 32GK850G + LG 32UD59
Schiit Yggy & Ragnarok -> HD800S
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