1.28 vcore is still low, haha. Now you know how I felt after being stable at 3.66GHz with low - mid 1.2X voltages, needed high 1.2Xs to get 4.0GHz cooperating.
Got to play with a D0 920 system this morning (the one that my mate built for another mate and pretty much told me that “you can’t get it stable at 4.0GHz”). It’s based on a GB X58 board so it was right up my alley.
So I jumped in the drivers seat, put in some reasonable voltage settings that would allow a D0 to run with H/T on (which is lower than my C0 needs for the same clock speed with it off, so tempted). Straight away it managed to get through a couple of LinX runs before stopping on an error, but no BSOD. Bit more playing and it was running at 4.01GHz. After that, my friend who owned the pc said to my other mate in a cheeky tone, “I had a feeling nipper was going to do a better job than you right from when he pressed the on button.” That said it all, lol
Maxed at 76’C on a corsair H50 which would have to be the biggest waste of money I’ve seen after using one and having to reseat it. I say this with full confidence, do not buy one over a decent tower HSF, they are no better. This was at a 20’C ambient temp also, absolute rubbish cooler. I told him that he was going to run into problems on hotter days.
The voltages still need to be tweaked a lot but I only had a couple of hours to get the job done before he needed to leave. So I basically got it stable with average volts and told him to have a play around with them if he wanted to, gave him a crash course in OCing
191MHz x 21 multi = 4.01GHz
191 x 8 RAM multi = 1528MHz
QPI 191 x 36 = 6.8 GHz
Uncore 191 x 16 = 3056MHz
CPU Vcore - 1.280v in windows (HT on, dvid on, llc level 1)
QPI/VTT - 1.240v
QPI PLL - 1.240v
DRAM - 1.64v
IOH - 1.02 (this probably wasn’t needed at all)
All other voltages where left as normal.
All those voltages can be dropped, the CPU will probably survive on 1.25 or even less vcore imo. I’ve said this before, the 920 D0 is an absolute pearler when it comes to overclocking, even the bad ones are good in comparison to the C0s.