2500+ OC - Ongoing Experience
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October 6, 2011, 09:52 AM
Join Date: Jul 2009
4.8 is verified stable with a 13 hour P95 blend run. 1.428vcore. Gigabyte bios is not fully implemented with respect to LLC and offset, both cannot be run at the same time. I am using LLC level 5. On the downside, this means my IDLE voltage is running at 1.476...this is not really a concern to me, as my idle temps are 30C and the chip throttles back to half of stock speed. The board is very stable, I have all power saving features enabled (C1, C3/C6, EIST, etc.).
The board is super simple to get to 4.5....I can leave everything, including vcore, on auto
My methodology to get the overclock, after much reading, was to leave the cpu multiplier at stock and put my desired 48 multiplier in each core under the turbo setting. I have manually set the RAM multi to 18.6X, again Gigabyte has a strange implementation and if you use XMP profile, it sets the cpu back to stock speed. I haven't played with my RAM timings yet, and have it set to the lowest value in bios of 3 (standard, quick, expert) and turbo (not to be confused with cpu turbo) disabled. My next step is to tighten up the settings and see how/if it affects stability.
I haven't done a ton of benchmarking yet, but here is my 3DM 11 progression (GTX580 @ stock, slightly factory overclocked speed) :
i7 920 @ 3.6 = P6459
2500K @ stock, memory @ 1333 = P6281
2500K @ 4.0, memory @ 1333 = P6495
2500K @ 4.5, memory @ 1333 = P6597
2500K @ 4.8, memory @ 1866 = P6641
As you can see, in this particular benchmark the 2500K isn't much of an upgrade from the i7 920...but there are other benchmarks where the new generation clearly outstrips the old and the hidden benefit is the power consumption, 95W on the 2500K vs 130W for the older chip - 27% improvement. Probably only a couple bucks a month on my power bill, but I'll take it.
The H80 is working out great. I leave it on the highest of the 3 settings at all times. Idle temps right around 30C, running P95 overnight it never saw 70C and averaged 65C, with my case fans on lowest setting. Ambient is constantly 21-22C.
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