Haswell overclocking issues

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Supreme [H]ardness
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Mar 2, 2010
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I have a 4670k with a z97a mobo and seem to have hit a brick wall with this setup at 4.6ghz. It wont boot under 1.35v but its stable at 1.35. The thing i dont get from reading around is that i should be running hot as fuck with that vcore and OC but i dont even break 70c under full load on air (noctua nhu12). This leads me to think there is a voltage setting i need to bump to get over this hump.

Any ideas?
 

vegeta535

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4.6ghz is really good overclock for a Haswell. Anymore then 4.6ghz would be considered a golden chip. I got a 4770k and it is a dud overclocker. I Can't get it passed 4.3ghz no matter what and my temps are in the low 60s at full load.
 
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Both 4670k's I had wouldn't do more then 4.5/4.6ghz, seems to be the average for the chip. I did have several 4690k's that did 4.8/4.9ghz though.
 

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Supreme [H]ardness
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Lame, got my hopes up because of the relatively low temps but even at 1.45v it just won't go above 4.6
 

ccityinstaller

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Feb 23, 2007
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What Cache multiplier are you using? Try dropping it to 40X (4Ghz is plenty fast enough) and that might get you another 100~200mhz if it is indeed a good sample.
 

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Supreme [H]ardness
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What Cache multiplier are you using? Try dropping it to 40X (4Ghz is plenty fast enough) and that might get you another 100~200mhz if it is indeed a good sample.

So as an update, with 1.5 vcore with 2.05 input voltage and 1.3 cache i can get it stable to 4.8 but it hits low 90s on air (i did lower the cache multi to 28 to test, i keep reading the performance difference is practically nil)

So about 20c for 200 mhz. On a full water loop it would probably be cool but ill take 4.6 @ 69c tops over 4.8 @ 93c.
 

Mav451

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Considering the averages for Haswell (4.5Ghz@1.3), you're doing just fine. And as you've noticed, once you're beyond the 0.04v per multi, the scaling gets pretty ridiculous.

Same reason I can opt for say 1.18 or 1.23 for 4.5Ghz or 4.6Ghz, respectively, and have dramatically lower cooling requirements :p
 
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