Originally Posted by rluker5
My motherboard doesn't have a lot of options that work consistently with overclocking this cpu, so you may be able to find better tuning than this, but what I use is:
3.8 all cores, 3.4 cache @ 1.165v max for both ( I don't have the option for separate control that works consistently
). 3.9 cores, 3.5 cache @ 1.19v. 4.0 cores, 3.6 cache @ 1.225. 4.1 cores, 3.7 cache @ 1.29v. And 4.2 cores, 3.7 cache @ 1.335v.
I use the xtu built in benchmark and if it passes I add .01v to .015v and it has been stable for me for gaming and casual use. I haven't been able to get more out of my cache at those voltages and 3.8 ghz cache is hit or miss with my chip. Not quite as hard to get as 4.3 on the cores (tried up to a questionably thermally stable 1.425v for that so far) but still not holding that well. And I didn't see a noticeable increase on the xtu bench going from 3.7 cache to 3.8 cache so I left it at max 3.7. But I do see an increase on that bench for all other steps and a little decrease when I reduce my voltage to the minimum for the speed I can run the chip at. I've used the 3.8 the most followed by the 4.0 then the 4.2. The 3.9 and 4.1 test the same in xtu but I haven't used them outside of that. Only have had this 5775c a few weeks
I also don't trust my mobo to consistently give the voltages I tell it to, I trust the voltages as monitored instead. It gives the same v every time with a given setting, but it isn't always what I tell it.
This seems like it is mostly just with the 5775c. My EVGA Z97 Classified was better with my 4770k, but still not nearly as nice to use as the Asus Z87 Deluxe it replaced. But the EVGA did win on cpu performance at 4.9 ghz for the 4770k. And is just fine for ram and flat out excellent for my graphics cards so I will live with the akward cpu overclocking.
Because of my mobo I rely heavily on xtu for cpu overclocking.
I was able to get 4.3 cores to work for the 3dmark api test, but just for that.
Also I run my 4 sticks of ram at the best speed I can get at 1.525v (2 sticks ran faster but I have 4 so I'm using them)
So maybe you have to dial back your cache for the volts you are giving it.