i7 4930k overclocking + BCLK question

[Tech Wizard]

Hey,

 

I've done some OC on my i7 4930k. I have not played with base clocks, just voltage and the multiplier. Below is a picture of the results with all information:
Green is obviously stable, while red caused system to crash / bluescreen during stresstest. BCLK frequency is set at default/stock 100,0MHz in the results below:

 

 

What do you think about these overclocks? Which one do you recommendd for 24/7 use? I'm thinking the 4,2GHz OC is best, as the jump in voltage from 4,2 to 4,4 is huge (+0,050V for each 0,1GHz OC beyond 4,2GHz).

Also, I was thinking of increasing the base clock frequency (BCLK) to increase my overclock. The default base clock of the 4930k is 100.0MHz. Would I see any benefit to increasing BCLK frequency to let's say 110,0MHz, or even 125MHz with let's say 4,0/4,2GHz multiplier? Does BCLK overclocking cause any instability? Do I gain more FPS / less rendering times with increased BCLK clocks? Thanks for reading/answering

[Jumper118]

3 minutes ago, Tech Wizard said:

Hey,

 

I've done some overclocking on my i7 4930k. I have not played with base clocks, just voltage and the multiplier. Below is a picture of the results with all information:
Green is obviously stable, while red caused system to crash / bluescreen during stresstest.

 

 

What do you think about these overclocks? Which one do you recommendd for 24/7 use? I'm thinking the 4,2GHz OC is best, as the jump in voltage from 4,2 to 4,4 is huge (+0,050V for each 0,1GHz OC beyond 4,2GHz).

Also, I was thinking of increasing the base clock frequency (BCKL) to increase my overclock. The default base clock of the 4930k is 100.0MHz. Would I see any benefit to increasing BCKL frequency to let's say 110,0MHz, or even 125MHz with let's say 4,0/4,2GHz multiplier? Does BCLK overclocking cause any instability? Do I gain more FPS / less rendering times with increased BCLK clocks? Thanks for reading/answering

i would try the 125 strap, but if that doesnt work then that 4.4ghz oc looks best to me. 

[Coaxialgamer]

forget about bclock OC on anything later than sandy bridge . You'll be lucky if you get 105 mhz .

 

Also , i wouldn't use p95 for testing , as it creates an unrealistic load . Intel XTU's stress test or aida 64 stability test is better imo.

[Tech Wizard]

2 minutes ago, Jumper118 said:

i would try the 125 strap, but if that doesnt work then that 4.4ghz oc looks best to me. 

I think I'm going to try the 110 strap instead, based on what Coaxialgamer said. Which multiplier do you suggest I use with the 110 strap? 40 or 42? Also, would I need to increase voltage from my multiplier's picture above?

Also, perhaps you missed my question in the bottom. What does BCLK overclocking do? Do I get any benefit/insatbility? 

1 minute ago, Coaxialgamer said:

forget about bclock OC on anything later than sandy bridge . You'll be lucky if you get 105 mhz .

 

Also , i wouldn't use p95 for testing , as it creates an unrealistic load . Intel XTU's stress test or aida 64 stability test is better imo.

How come? Why is BCLK OC on anything after Sandry Bridge not worth it?

Also, perhaps you missed my question in the bottom. What does BCLK overclocking do? Do I get any benefit/insatbility? 

Thanks for the tip about the stress tests though!

[Jumper118]

Just now, Tech Wizard said:

I think I'm going to try the 110 strap instead, based on what Coaxialgamer said. Which multiplier do you suggest I use with the 110 strap? 40 or 42? Also, would I need to increase voltage from my multiplier's picture above?

Also, perhaps you missed my question in the bottom. What does BCLK overclocking do? Do I get any benefit/insatbility? 

How come? Why is BCLK OC on anything after Sandry Bridge not worth it?

Also, perhaps you missed my question in the bottom. What does BCLK overclocking do? Do I get any benefit/insatbility? 

Thanks for the tip about the stress tests though!

the strap is not the same as bclk. the base clock might not work at 110, but the strap will work at 125mhz 

[Tech Wizard]

Just now, Jumper118 said:

the strap is not the same as bclk. the base clock might not work at 110, but the strap will work at 125mhz 

I remember seeing 100, 110, 125 and one more in strap list in BIOS

[Jumper118]

2 minutes ago, Tech Wizard said:

I remember seeing 100, 110, 125 and one more in strap list in BIOS

that is strange its normally 125, 150,175,200

[Coaxialgamer]

7 minutes ago, Tech Wizard said:

How come? Why is BCLK OC on anything after Sandry Bridge not worth it?

Also, perhaps you missed my question in the bottom. What does BCLK overclocking do? Do I get any benefit/insatbility? 

Thanks for the tip about the stress tests though!

The base clock provides a reference clock for many parts of the board ( individual parts have a (usually locked) multiplier ) , so when you increase your bclock frequency , not only are you overclocking your CPU , but you are also overclocking your ram , you DMI bus , your pcie bus , your chipset , sata bus etc .

 

Having many parts go out of spec ( usually considering they don't have much headroom ) can sometimes cause instability . 

in the old days , only RAM and a few other parts ran off the bclock ( or FSB) , but now a lot more are dependent on it.

 

also , the strap isn't the bclock.

[Tech Wizard]

4 minutes ago, Coaxialgamer said:

The base clock provides a reference clock for many parts of the board ( individual parts have a (usually locked) multiplier ) , so when you increase your bclock frequency , not only are you overclocking your CPU , but you are also overclocking your ram , you DMI bus , your pcie bus , your chipset , sata bus etc .

 

Having many parts go out of spec ( usually considering they don't have much headroom ) can sometimes cause instability . 

in the old days , only RAM and a few other parts ran off the bclock ( or FSB) , but now a lot more are dependent on it.

 

also , the strap isn't the bclock.

Judging by that definition, I just became nervous to overclock BCKL  Which OC do you recommend for 24/7 use from my picture in the top though?

[Coaxialgamer]

13 minutes ago, Tech Wizard said:

Judging by that definition, I just became nervous to overclock BCKL  Which OC do you recommend for 24/7 use from my picture in the top though?

imo , 4.4ghz is pretty good . Temps are still within reason ( especially considering that was with p95 ) and voltage is also good .

[hogfather]

1 hour ago, Tech Wizard said:

Hey,

 

I've done some OC on my i7 4930k. I have not played with base clocks, just voltage and the multiplier. Below is a picture of the results with all information:
Green is obviously stable, while red caused system to crash / bluescreen during stresstest. BCLK frequency is set at default/stock 100,0MHz in the results below:

 

 

What do you think about these overclocks? Which one do you recommendd for 24/7 use? I'm thinking the 4,2GHz OC is best, as the jump in voltage from 4,2 to 4,4 is huge (+0,050V for each 0,1GHz OC beyond 4,2GHz).

Also, I was thinking of increasing the base clock frequency (BCLK) to increase my overclock. The default base clock of the 4930k is 100.0MHz. Would I see any benefit to increasing BCLK frequency to let's say 110,0MHz, or even 125MHz with let's say 4,0/4,2GHz multiplier? Does BCLK overclocking cause any instability? Do I gain more FPS / less rendering times with increased BCLK clocks? Thanks for reading/answering

Are you 100% sure about the 4.4 @ 1.325v ?

 

I would suggest the following:

- set voltage to a static value, say 1.3

- down clock ur ram a bit and bump up the timings a bit. also add a bit of extra voltage to the ram. this will help with stability and won't cost u much - maybe one fps.

- run Eida 64 cpu test or Intel BurnIn test - even if the test fails after like 6 hours it doesn't really matter for day to day activities. 

- invest in an AIO. A water cooler will really help. For comparison I'm running mine at 4.4 with 1.292v at 65 degrees max.

 

I wouldn't bother with the strap because that does magical things to lots of other settings and unless you understand what it does, I wouldn't bother. 

 

 

[hogfather]

I should also add, that your 212EVO might appreciate some extra air being pushed through it, so consider upping the fan profile and ideally having a intake fan bringing in fresh air into the case and an extra fan exhausing the hot air. 

[Tech Wizard]

59 minutes ago, Coaxialgamer said:

imo , 4.4ghz is pretty good . Temps are still within reason ( especially considering that was with p95 ) and voltage is also good .

 

1 hour ago, Jumper118 said:

that 4.4ghz oc looks best to me. 

Both of you are suggesting 4,4GHz, but I'm thinking more about the 4,2GHz. The voltage difference between those two are so big! The temps also rises skyhigh with 1.3V in my opnion. Hmm...

[Coaxialgamer]

Just now, Tech Wizard said:

 

Both of you are suggesting 4,4GHz, but I'm thinking more about the 4,2GHz. The voltage difference between those two are so big! The temps also rises skyhigh with 1.3V in my opnion. Hmm...

true , but it's still well under control . you're not going to fry your chip with that voltage ( you can go up to 1.4v np) and seeing as you only reached 82C on the hottest core in p95 , you're more than fine temp wise.

[hogfather]

3 minutes ago, Tech Wizard said:

 

Both of you are suggesting 4,4GHz, but I'm thinking more about the 4,2GHz. The voltage difference between those two are so big! The temps also rises skyhigh with 1.3V in my opnion. Hmm...

this is also during a synthetic test, which does not simulate day to day loads

[Jumper118]

7 minutes ago, Tech Wizard said:

 

Both of you are suggesting 4,4GHz, but I'm thinking more about the 4,2GHz. The voltage difference between those two are so big! The temps also rises skyhigh with 1.3V in my opnion. Hmm...

you want maximum performance for the chip within a safe limit though, not the best performance per watt? 

[Tech Wizard]

6 minutes ago, hogfather said:

Are you 100% sure about the 4.4 @ 1.325v ?

 

I would suggest the following:

- set voltage to a static value, say 1.3

- down clock ur ram a bit and bump up the timings a bit. also add a bit of extra voltage to the ram. this will help with stability and won't cost u much - maybe one fps.

- run Eida 64 cpu test or Intel BurnIn test - even if the test fails after like 6 hours it doesn't really matter for day to day activities. 

- invest in an AIO. A water cooler will really help. For comparison I'm running mine at 4.4 with 1.292v at 65 degrees max.

 

I wouldn't bother with the strap because that does magical things to lots of other settings and unless you understand what it does, I wouldn't bother. 

 

 

What do you mean if I'm 100 sure about the 4,4? It didn't crash/instability at 1.325V, but did at 1.300V.
I'm thinking of just going with 4,2/4,4GHz with the green voltage in my picture above. Not going to play with RAM, as I have no knowledge there. Rather let the XMP controll it.
I will try Eida 64 or Intel BurnIn test as you suggested, and see if the temps differs alot from prime95 with exact same settings as my picture above.
Thinking of buying Kraken X61/62, or Corsair H100i v2 / H80i v2.

3 minutes ago, hogfather said:

I should also add, that your 212EVO might appreciate some extra air being pushed through it, so consider upping the fan profile and ideally having a intake fan bringing in fresh air into the case and an extra fan exhausing the hot air. 

I used to have an aggressive CPU Fan Curve, where my 212 EVO would spin 100 % (1600RPM) at like 60c, but found the sound annoying, so disabled my fan curve and just rolled with the "silent" preset in bios. Oh don't worry about air flow, have 1x 140mm rear exhaust, and 2x 140mm intake front (with dust filter). See this thread for pics of my PC: 

 

[hogfather]

15 minutes ago, Tech Wizard said:

What do you mean if I'm 100 sure about the 4,4? It didn't crash/instability at 1.325V, but did at 1.300V.
I'm thinking of just going with 4,2/4,4GHz with the green voltage in my picture above. Not going to play with RAM, as I have no knowledge there. Rather let the XMP controll it.
I will try Eida 64 or Intel BurnIn test as you suggested, and see if the temps differs alot from prime95 with exact same settings as my picture above.
Thinking of buying Kraken X61/62, or Corsair H100i v2 / H80i v2.

I used to have an aggressive CPU Fan Curve, where my 212 EVO would spin 100 % (1600RPM) at like 60c, but found the sound annoying, so disabled my fan curve and just rolled with the "silent" preset in bios. Oh don't worry about air flow, have 1x 140mm rear exhaust, and 2x 140mm intake front (with dust filter). See this thread for pics of my PC: 

 

I wouldn't recommend  XMP profiles while over clocking. XMP does more than just adjust ur ram timings.  Therefore, I would turn it off, set 1866 for the frequency and add 2 to all the advertised timings your ram can support.  Then, set Manual Offset to 1.28 and test. if Eida64 runs for like 10-15 minutes, you may want to leave it for a longer run - i.e a few hours or just use ur pc normally.  If the initial test fails, then bump up by a factor of 0.05 and re-run the test.