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Haswell 4770K Overclocking Help

post #1 of 9
Thread Starter 
Hello,
My first time dabbling in overclocking so I have a few questions. I've followed a couple videos and have read guides in length before asking. I've done the step by step of finding stable cpu at 4.4 Ghz and then doing the cache and then the RAM. I'm currently stable with the CPU at 4.4 Ghz(1.32V), the cache at 4.2 Ghz(1.31V) and the RAM at 2400 Mhz (1.71V). My temps have maxed at 73C and mostly stay in the mid 60's during the stress testing. Is the plus 1.3 volts ok? Most of the guides ive read have said you shouldn't need more than 1.3V for 4.4Ghz and when I see other peoples posts here they are 1.25ish..

When I run XTU or Prime 95 it crashes in 10 mins with any voltages less. With these voltages ive ran for 8 hours. I'm just not sure what voltage I should stay under, as long as temps are below 80C am I good to keep raising voltage? Thanks!

My build:
Mobo: ASUS Formula VI
CPU: 4770k (Batch 340)
RAM: Gskill Trident 2400
Gpu: GTX 780ti
SSD: 500GB Samsung EVO
CPU Cooler: CM Glacer 240L (Push/Pull)
PSU: Corsair RM 1000
post #2 of 9
Your chip seems about average, just slightly below. Remember it's not the temps that kill, it's the voltages, which leads to degradation. 1.32 is a little uncomfortable for me. 1.31 is slightly pushing it. I'd like to stay under 1.3 for the sake of longevity. My 4670k is stable at 4.5 with 4.0 cache at 1.30 and 1.2 respectively.
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Golden Boy
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post #3 of 9
If you aren't using manual voltage, be sure to run other non-AVX2 stress tests. Prime95 and XTU overvolt Haswell's core by 0.1v, which increases temps, but could also give you an artificial sense of stability.
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post #4 of 9
Thread Starter 
Thanks for the reply. So in this case would your suggestion be to drop to 4.3 Ghz and try and get under 1.3V?
post #5 of 9
Quote:
Originally Posted by blackbobb12 View Post

Thanks for the reply. So in this case would your suggestion be to drop to 4.3 Ghz and try and get under 1.3V?

Be sure to increase the VCCIN to 1.925 or 1.95(Input Voltage for ASUS boards). Sometimes input voltage is the culprit to overclock walls. Don't worry about the temps on this one as it is negligible and won't increase it much. Watch your temps anyway. Then try to get a higher core clock again. It could be your cache that is causing stability. Try lowering it.
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post #6 of 9
Thread Starter 
Quote:
Originally Posted by Sev7_d View Post

Be sure to increase the VCCIN to 1.925 or 1.95(Input Voltage for ASUS boards). Sometimes input voltage is the culprit to overclock walls. Don't worry about the temps on this one as it is negligible and won't increase it much. Watch your temps anyway. Then try to get a higher core clock again. It could be your cache that is causing stability. Try lowering it.

I backed down cache and raised the VCCIN to 1.95 (I assume this is Initial CPU Input Volt, there's also Eventual CPU Input Volt). Brought up RealBench and it crashed within 10 minutes at 44. I guess I have a bum chip and takes 1.32 to keep 44 stable. I can get 43 with 42 cache at 1.3V. It ran for 5 hours with no issues on XTU and benchmarked on realbench, but it did crash after an hour with prime 95 on one of the higher temp causing tests.

Can I ignore the prime 95 test and say XTU and realbench are good and call it good stable? I'm not sure the difference in the tests, but does seem like prime 95 is unrealistically taxing.
post #7 of 9
Quote:
Originally Posted by blackbobb12 View Post

I backed down cache and raised the VCCIN to 1.95 (I assume this is Initial CPU Input Volt, there's also Eventual CPU Input Volt). Brought up RealBench and it crashed within 10 minutes at 44. I guess I have a bum chip and takes 1.32 to keep 44 stable. I can get 43 with 42 cache at 1.3V. It ran for 5 hours with no issues on XTU and benchmarked on realbench, but it did crash after an hour with prime 95 on one of the higher temp causing tests.

Can I ignore the prime 95 test and say XTU and realbench are good and call it good stable? I'm not sure the difference in the tests, but does seem like prime 95 is unrealistically taxing.

Stress tests are unrealistically taxing. That's the point. If you're stress test stable, more than likely you are real world stable. And another thing to note, your goal is not to pass all stress tests... All stress tests are programed differently to tax your cpu in some way or another or all. For example: AIDA64 is a good test just like the others but again, AIDA64 will give you different temps and likely different results. You can be stable in one test and fail another. There's hardly an application out that that will tax your cpu as much as XTU, Prime, OCCT, etc.. As long as your good on at least 2 stress test for at least several hours, then you're fine.

I once had my 4770k at 4.7 with 4.6 cache. The voltages were out of this world yet I couldn't even hold Prime for 10 minutes lol but, I played Starcraft and benched it on Cinebench and geekbench fine. Did I consider that oc stable? of course not. This was just an example. Find what ratio you are nice and cozy at and stay there. but if you really want to do 4.4 try these settings:

Manual
4.4 - 1.3 VIN
3.6 - Auto or 1.1
1.95 VCCIN
DRAM at 1600mhz or 1333mhz / 1.5V
LLC up high

Try that and see.
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Golden Boy
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post #8 of 9
Thread Starter 
Quote:
Originally Posted by Sev7_d View Post

Stress tests are unrealistically taxing. That's the point. If you're stress test stable, more than likely you are real world stable. And another thing to note, your goal is not to pass all stress tests... All stress tests are programed differently to tax your cpu in some way or another or all. For example: AIDA64 is a good test just like the others but again, AIDA64 will give you different temps and likely different results. You can be stable in one test and fail another. There's hardly an application out that that will tax your cpu as much as XTU, Prime, OCCT, etc.. As long as your good on at least 2 stress test for at least several hours, then you're fine.

I once had my 4770k at 4.7 with 4.6 cache. The voltages were out of this world yet I couldn't even hold Prime for 10 minutes lol but, I played Starcraft and benched it on Cinebench and geekbench fine. Did I consider that oc stable? of course not. This was just an example. Find what ratio you are nice and cozy at and stay there. but if you really want to do 4.4 try these settings:

Manual
4.4 - 1.3 VIN
3.6 - Auto or 1.1
1.95 VCCIN
DRAM at 1600mhz or 1333mhz / 1.5V
LLC up high

Try that and see.

Thanks. I have it set to:
4.3 - 1.3v ( I tried 1.29 and crashed)
4.2 - 1.28v
1.95 VCCIN
DRAM at 2400/1.65v

I ran XTU for 8 hours and real bench is 5 hours in now and no problems and heat low. I'll try prime in a bit when rb is done running. So I think I'm going to save these settings and call it stable. I've actually tried the suggested above when starting to find the stable cpu overclock and 1.32 is where I have to set volt for it to run any stress test more than 10 mins.
post #9 of 9
Quote:
Originally Posted by blackbobb12 View Post

Thanks. I have it set to:
4.3 - 1.3v ( I tried 1.29 and crashed)
4.2 - 1.28v
1.95 VCCIN
DRAM at 2400/1.65v

I ran XTU for 8 hours and real bench is 5 hours in now and no problems and heat low. I'll try prime in a bit when rb is done running. So I think I'm going to save these settings and call it stable. I've actually tried the suggested above when starting to find the stable cpu overclock and 1.32 is where I have to set volt for it to run any stress test more than 10 mins.

Try this

Under DIGI+ Power control put the CPU load-line calibration to level 8.

for 4.6GHz I need 1.350v
4.3GHz Max cache ratio 1.185v cache voltage
3.9GHz Min cache ratio

for 4.5GHz I need 1.270v
4.4GHz Max cache ratio 1.185v cache voltage
3.9GHz Min cache ratio

for 4.3GHz 1.185.

Also have you changed your Eventual CPU input voltage?
I have mine set to 2.000
Edited by Its L0G4N - 3/27/14 at 3:41pm
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