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Haswell Overclocking Guide [With Statistics] - Page 1915

post #19141 of 19637
Managed to get x45 stable at 1.215 vcore (LLC and chipset voltage on offset mode, 0.4v+) on my I5 4690k. Had to stop there due to temperature issues (using an H60), since gaming temps are at 68 degrees (winter time lol). For what I saw at the table, I feel very good about the voltage, and I assume I can go higher, but it's risky with that kinda temps.
Any ideas? Is decreasing the cache multiplier really worth it? Does it affect the temps?
post #19142 of 19637
Quote:
Originally Posted by testostern View Post

Managed to get x45 stable at 1.215 vcore (LLC and chipset voltage on offset mode, 0.4v+) on my I5 4690k. Had to stop there due to temperature issues (using an H60), since gaming temps are at 68 degrees (winter time lol). For what I saw at the table, I feel very good about the voltage, and I assume I can go higher, but it's risky with that kinda temps.
Any ideas? Is decreasing the cache multiplier really worth it? Does it affect the temps?


Those temp's are completely fine. I personally would stay under 85C when applying more than 1.3v.

I was running my 4690k with 1.35v @ 4.9ghz temps under 80C with h100i v2, no delid.
post #19143 of 19637
Quote:
Originally Posted by Benjiw View Post

IBT said my 4.8ghz was stable but when I tested with X264 I couldn't pass it at all. Maybe my overclocks are poor and I'm not doing it correctly? Getting my PC in a few so I'll take some time to re-do my overclock.

Welp, had to let you know that you were indeed right. Failed x264 miserably (only 1 loop LOL) with my 4.7 overclock. Back to the drawing board for me. Currently passed 50 loops at 4.5 1.28v. Testing 4.6 1.36v now (1.35v failed at 27 loops >_<).
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post #19144 of 19637
Quote:
Originally Posted by Nick the Slick View Post

Welp, had to let you know that you were indeed right. Failed x264 miserably (only 1 loop LOL) with my 4.7 overclock. Back to the drawing board for me. Currently passed 50 loops at 4.5 1.28v. Testing 4.6 1.36v now (1.35v failed at 27 loops >_<).

I normally test for 10-15 loops, if it passes that then it's stable for me. Once you get over 1.3v you need to start fine tuning I found and heat seems to be a big issue with these chips much like with AMD FX chips. Keep em cool and you can clock them.
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post #19145 of 19637
Well 4.6 passed 50 loops last night @ 1.36V. Testing 4.7 @ 1.45V while I'm at work. Just trying 1.45v again since I set cache back to stock, seeing if maybe it was just a bad cache overclock.
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post #19146 of 19637
Quote:
Originally Posted by Nick the Slick View Post

Well 4.6 passed 50 loops last night @ 1.36V. Testing 4.7 @ 1.45V while I'm at work. Just trying 1.45v again since I set cache back to stock, seeing if maybe it was just a bad cache overclock.

I found keeping my cache clock close to my core helped me a lot, if it was too low it made me unstable and I'm not 100% sure why. I cranked up the voltage for cache too. Locked in at 4.7ghz 24/7 now but the voltage is a tad bit high at 1.5v.
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post #19147 of 19637
Quote:
Originally Posted by Benjiw View Post

I found keeping my cache clock close to my core helped me a lot, if it was too low it made me unstable and I'm not 100% sure why. I cranked up the voltage for cache too. Locked in at 4.7ghz 24/7 now but the voltage is a tad bit high at 1.5v.

What exactly do you mean by "close to"? Like within 200Mhz? More, less? Sounds interesting, I may give that a go some other time but 4.7 is failing x264 even at 1.49v for me right now so I think I'm just going to back it back down to the stable 4.6 I found and start working on cache for now. Once I get this down I may try 4.7 again with the higher cache and see what happens. If that holds true I wonder what's the deal with that? Could it be the extra voltage required to stabilize the higher cache somehow helping out the core? Or is that just ridiculous? lol
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post #19148 of 19637
Quote:
Originally Posted by Nick the Slick View Post

What exactly do you mean by "close to"? Like within 200Mhz? More, less? Sounds interesting, I may give that a go some other time but 4.7 is failing x264 even at 1.49v for me right now so I think I'm just going to back it back down to the stable 4.6 I found and start working on cache for now. Once I get this down I may try 4.7 again with the higher cache and see what happens. If that holds true I wonder what's the deal with that? Could it be the extra voltage required to stabilize the higher cache somehow helping out the core? Or is that just ridiculous? lol

Yes higher cache but you need to up your input voltage:
Quote:
Input Voltage (aka VCCIN, Vrin, Eventual Input Voltage)
The VRIN can be thought of as the entire amount of voltage drawn by the CPU and all of its components.

When your Vcore is really going up, at least 1.30 probably 1.35v or above, you may need to change other settings. For one, keep your Vccin or total CPU voltage to 0.5v above Vcore. You can try 1.9 or 2.0v. 2.2 is uncharted territory, but for my personal overclock, a Vcore of 1.42 required Vccin of 2.15v for stability. Vccin is also known as Vrin. In Asus ROG boards, try tweaking the "eventual input voltage" instead. No benefits have been recorded by tweaking the "initial input voltage" setting.

I recommend changing input voltage in 0.05v increments. Any less you need a zen-like patience to test everything. I recommend max 0.1v increment if you are lazy. Do not do the same with Vcore or other types of voltages obviously. The reason why input voltage becomes a larger factor at higher Vcore is because input voltage is typically automatically managed by the motherboard's own software. But when the Vcore goes high up, the motherboard almost never compensates the input voltage well enough to ensure stability. Depending on how good your motherboard is at making sure the CPU has enough input voltage for the Vcore, you may have to tweak the input voltage before you even hit 1.3v Vcore.

For my case, I was trying to get x46 core multiplier and could not stabilize. Odd, considering x45 was rock solid @ 1.35v. I scaled up voltage from 1.35 to 1.4, 1.42, 1.47, 1.5, 1.512v, without being any more stable as voltage went up. The key was a higher Vcore, AND a higher input voltage. I demonstrated this by testing stability at 1.42v with various input voltage. I tested by running x264 until Bsod 5 times per setting, keeping track of averages. From 1.85 to 1.95 to 2.05 to 2.15, I could see demonstrable improvement in stability, with a higher maximum, minimum, and average time until Bsod. So what is this saying? Often times we are just tempted to test the Vcore and if it doesn't work, just get a higher Vcore, and higher, until we use ridiculous voltage and still crash, where we then put our hands in the air and give up. Just chucking Vcore as high as you can will often not net stability if you do not have high enough input voltage to match that high Vcore.

Also keep in mind that the amount of Vrin you need for a specific Vcore varies from CPU to CPU.
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post #19149 of 19637
Yea I'm aware of Vrin, I set it to 2 when I'm trying to find max clock, wasn't willing to go above that. I might try up to 2.15 though when i retry for 4.7. So far I got 4.6 core @ 1.36v and 4.5 cache at 1.3v stable for 50 loops. Gonna start optimizing voltages now and see how low I can get them, then I might try for 4.7 again. Thanks for the tips though, just when you think you've got it down there's always room for improvement lol.
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post #19150 of 19637
Quote:
Originally Posted by Nick the Slick View Post

Yea I'm aware of Vrin, I set it to 2 when I'm trying to find max clock, wasn't willing to go above that. I might try up to 2.15 though when i retry for 4.7. So far I got 4.6 core @ 1.36v and 4.5 cache at 1.3v stable for 50 loops. Gonna start optimizing voltages now and see how low I can get them, then I might try for 4.7 again. Thanks for the tips though, just when you think you've got it down there's always room for improvement lol.

I've had mine at 2.2v and it was fine. if you're too low or too high you won't be stable.
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