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Thoughts on 4770k Overclock

post #1 of 8
Thread Starter 
Wanting to gather some thoughts on my 4770k chip. I believe it is below average ( quite a bit perhaps).

Custom w/c loop. GPU and CPU.
Asus hero m/b.

My current stable overclock is with the following settings.

BCLK :100
CPU X: 40
Cache X: 40
Vcore 1.25
Cache voltage: auto

I have been trying to get 4.5ghz stable, because this would be the next stage for me. I aim for specific clocks and I am not fussed about stretching it to a maximum of 4.3ghz or something. I either want 4.5 or I'll stick with 4.

I have come closest to a stable 4.5 with the following settings:

Core Voltage: 1.325
Cache Voltage: 1.25
BCLK: 100
CPU X: 45
Cache X: 40
CPU Input Voltage (Initial and Final): 2.0

This has allowed me to run prime for 20 minutes before BSOD. Temperatures are around 70C.

I am new to Haswell and perhaps am just paranoid but I do not really want to push the Vcore much higher. It seems that the good chips can hit 4.5ghz with <1.2v. I understand Haswell is a lottery but should I accept that 4.5 won't be possible with this chip, or do I still have more room?
post #2 of 8
Just started with overclocking. I was not able to get my 4770k stable at 4.3 @ 1.275v but after deliding I am running at 4.3 @ 1.17

I know I am stable at 4.5 @ 1.28 I can get stable at 1.48 also but vcore is high. I would like to see what other has to say also and learn from it biggrin.gif
Edited by Tacoma - 9/17/13 at 10:43am
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post #3 of 8
Thread Starter 
See as far as I am concerned my temps are okay and thus delidding shouldn't make a difference?

I have just tried a couple more tweaks for 4.5, I have upped the Core voltage to 1.375 and the uncore/cache to 1.3 prime runs for about 15-20 mins still then BSOD. Temps remain around 75C max.
post #4 of 8
The cooler you can keep the cpu, the less voltage it takes to be stable. For example 4.5ghz @ 70c will take more voltage than 4.5ghz @ 50c. So even though your temps are still safe, delidding will help you.
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post #5 of 8
The volt difference because of the temperature is normally not very significant - the real benefit of delidding is to let you run higher voltages without hitting the temp limit, not running lower voltages because of lower temps.

OP, many, many chips need more than 1.325V for 4.5. I would try dropping your cache speed to 36x (in case your problem is cache related), drop your cache voltage to something more reasonable like 1.15V, and push your Vcore higher. You probably also don't need 2.0 volts for the input voltage, 1.8 or 1.85 should be sufficient for 1.35V.
post #6 of 8
Thread Starter 
Quote:
Originally Posted by Forceman View Post

The volt difference because of the temperature is normally not very significant - the real benefit of delidding is to let you run higher voltages without hitting the temp limit, not running lower voltages because of lower temps.

OP, many, many chips need more than 1.325V for 4.5. I would try dropping your cache speed to 36x (in case your problem is cache related), drop your cache voltage to something more reasonable like 1.15V, and push your Vcore higher. You probably also don't need 2.0 volts for the input voltage, 1.8 or 1.85 should be sufficient for 1.35V.

Your statement with regard to delidding would match my own thoughts.

I have actually just been trying to lower cache speed. I had it down at 30 with a cache voltage of 1.2v. I have then been trying to increase vcore to get a stable 4.5ghz. The last try was with 1.475v and still getting a BSOD when trying either prime or IBT. With this voltage my temps are pushing into the 90s so I think I will call it quits with upping that. I appreciate I might get more room from delidding but at this point I think I will stick with a lower clock. The voltage jump for my chip from 4.3hz (highest clock I have seen stable, although I am running 4.0 for now) seems massive. I can get 4.3 stable with 1.285, and nearly 0.2v higher and no luck with 4.5 despite running the cache down from 40 to 30.
post #7 of 8
Have you tried increasing VCCSA or VCCIOD (Digital I/O voltage)? They can have an impact on stability as well.
post #8 of 8
Thread Starter 
Forceman.

I have tried it very very tamely as I don't fully understand those voltages. I have the option to adjust an offset for them, and most reading I have done suggests they play a larger role when searching forhigher ram speeds and tighter timings. I have tried increasing them by +0.05 without noticing any effect.
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