- Jun 16, 2014
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Following this thread: http://forum.hwbot.org/showthread.php?t=108373
Has anyone had luck with lowering his VCCIN to achieve high(er) overclocks than usual?
I've tried messing with it a little, but it seems like mine isn't willing to work with lower vccin. I'd usually get 4.8ghz with 1.3(1)v vcore on 1.8v vccin, 4.9ghz with 1.37v, 1.82v vccin and 5.0ghz (not exactly stable) with 1.9v vccin.
At 4.8, when lowering vccin to 1.6v'ish, however, I seem to get issues booting windows - once it's booted it works fine, but it can take a few attempts until it doesn't hang. With 4.9 and 5.0ghz absolutely no luck lowering the vccin, not even a slight bit, which is unusual as I even need more than the "golden rule" of 0.4v which applied to haswell. 4.9ghz would still run IBT with 1.65v vccin, but require a whopping 1.43v vcore (
).
May this be related to any other voltage settings that somewhat require higher input voltage?
Strange enough, on lower clocks like 4-4.4ghz, I can lower vccin to 1.5v and have it running stable with 1.0v instead of 1.05/1.12 which I'd usually need - possibly even less.
This however doesn't help power consumption, but my chip seems to be very special in that aspect anyway, with 120w power draw during linpack at just 4.0ghz. Testing an i7 4790k on a z97x-sli, by the way. I'll maybe get to try it (and another chip) on a z97x-ud5h-bk and a z97-a soon.
Would be nice if some of you could try lowering vccin and experiment how that affects vcore requirements and post the achieved results.
PS: This doesn't appear to ever work on regular haswell or haswell refresh cpu's. I tried it on an i7 4770k just yesterday but it required 1.85v vccin for just 1.24v vcore (4.4ghz), anything below that it would 0x101/0x124 ocassionally. It would still run with 1.8v vccin with 1.285v vcore (4.6ghz) but crash or hang more often than not. With 1.9v on the other hand no issues occured at all.
Edit: Can go as low as 0.98v vcore with 1.45v vccin (4ghz), anything below that ocassionally crashes in IBT, although other software including prime seems to run stable.
Has anyone had luck with lowering his VCCIN to achieve high(er) overclocks than usual?
I've tried messing with it a little, but it seems like mine isn't willing to work with lower vccin. I'd usually get 4.8ghz with 1.3(1)v vcore on 1.8v vccin, 4.9ghz with 1.37v, 1.82v vccin and 5.0ghz (not exactly stable) with 1.9v vccin.
At 4.8, when lowering vccin to 1.6v'ish, however, I seem to get issues booting windows - once it's booted it works fine, but it can take a few attempts until it doesn't hang. With 4.9 and 5.0ghz absolutely no luck lowering the vccin, not even a slight bit, which is unusual as I even need more than the "golden rule" of 0.4v which applied to haswell. 4.9ghz would still run IBT with 1.65v vccin, but require a whopping 1.43v vcore (
).May this be related to any other voltage settings that somewhat require higher input voltage?
Strange enough, on lower clocks like 4-4.4ghz, I can lower vccin to 1.5v and have it running stable with 1.0v instead of 1.05/1.12 which I'd usually need - possibly even less.
This however doesn't help power consumption, but my chip seems to be very special in that aspect anyway, with 120w power draw during linpack at just 4.0ghz. Testing an i7 4790k on a z97x-sli, by the way. I'll maybe get to try it (and another chip) on a z97x-ud5h-bk and a z97-a soon.
Would be nice if some of you could try lowering vccin and experiment how that affects vcore requirements and post the achieved results.
PS: This doesn't appear to ever work on regular haswell or haswell refresh cpu's. I tried it on an i7 4770k just yesterday but it required 1.85v vccin for just 1.24v vcore (4.4ghz), anything below that it would 0x101/0x124 ocassionally. It would still run with 1.8v vccin with 1.285v vcore (4.6ghz) but crash or hang more often than not. With 1.9v on the other hand no issues occured at all.
Edit: Can go as low as 0.98v vcore with 1.45v vccin (4ghz), anything below that ocassionally crashes in IBT, although other software including prime seems to run stable.
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