I've just finished building a number of these and H87M Pro4 boards. All of them have had i5-4570S processors. I'm pretty sure that there is a bug in the BIOS (1.4) of the B85M-ITX involving setting the full processor multiplier. Comparing them side-by-side, the H87M, under full load, runs the processor at 3.6GHz on all cores. That's as it should be. (Naturally, that's how the BIOS is set). The B85M-ITX WITH THE SAME BIOS SETTINGS will not run all four cores faster than 3.2GHz simultaneously. There's no reason this should differ between boards. Needless to say, I've tried all possible settings to get this to work right, including setting manual ratios of 36-36-36-36. It will NOT achieve this on the processor. This is confirmed by both CPUID and actual benchmarks. CPUBenchmark of the H87M comes in at an astonishing 7846, while the same processor on the B85M is stuck at around 7100. This is consistent with the 3.2GHz limit. What actually happens despite the settings is that the processor behaves as if the cores are set for 36-35-34-32. I've simulated this loading with Prime95 and that's the best you can get out of it.
Could someone from ASRock please look into this and get the BIOS fixed?
Could someone from ASRock please look into this and get the BIOS fixed?
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