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i7 3820 - 4820 Overclock Club - Page 169

post #1681 of 6506
Quote:
Originally Posted by Mechrock View Post

I know this is from a long time ago, but wasn't sure if this was addressed or not.
Are the numbers you give for 24/7 100% cpu usage?
Also what temps?

not really just general usage with odd gaming and rendering also there not 100% accurate just a brief overview of how voltage effects chips
I should game.
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post #1682 of 6506
Curious to know.... I read that you DO NOT want to change the BCLK, as it overclocks the pci bus as well?


I'm currently running;

36 x 125.0mhz bclk giving me stable 4500mhz @ 1.40vcore (im working to lower it)
Ram is 1600mhz running @ 1333mhz 1.50v

Should I reduce the BCLK and increase the multiplier instead?


Thanks!
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post #1683 of 6506
Quote:
Originally Posted by theJaybo View Post

Curious to know.... I read that you DO NOT want to change the BCLK, as it overclocks the pci bus as well?
I'm currently running;
36 x 125.0mhz bclk giving me stable 4500mhz @ 1.40vcore (im working to lower it)
Ram is 1600mhz running @ 1333mhz 1.50v
Should I reduce the BCLK and increase the multiplier instead?
Thanks!
You are correct, however that's what the BCLK strap is for. If you run 125 BCLK the strap makes sure DMI and PCI are still at 100 mhz, only CPU and RAM will run at the actual BCLK value you set (125). You can still raise or lower BCLK outside the exact strap value a bit, but not much, around 5%. If you reduce your BCLK you'll actually cause the DMI and PCI speeds to deviate from their intended frequency, unless you set it to 100 but then you're limited to 4.3 ghz on your CPU.
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post #1684 of 6506
Thread Starter 
Quote:
Originally Posted by X79Extreme7UK View Post

Thats a very good overclock mate thumb.gif and very good temps knowing your ambient hovers around 30C WellDone thumb.gif

Thanks geezer dont forget u have the best stable 3820 o/c out there cheers.gif mate
post #1685 of 6506
Quote:
Thanks geezer dont forget u have the best stable 3820 o/c out there cheers.gif mate

Cheers cheers.gif ....I am sure someone might come up with something better (some named HOMECINEMA-PC maybe biggrin.gif ) but I haven't finished yet thumb.gif heheh
Seriously tho, in middle of Australian summer, those temps with that overclock is amazing eek.gif
post #1686 of 6506
Quote:
Originally Posted by X79Extreme7UK View Post

Cheers cheers.gif ....I am sure someone might come up with something better (some named HOMECINEMA-PC maybe biggrin.gif ) but I haven't finished yet thumb.gif heheh
Seriously tho, in middle of Australian summer, those temps with that overclock is amazing eek.gif

REP+ !!!


Thanks man, makes sense now! So that would explain why my 3d scores went down at one point while I was jamming numbers into the bios smile.gif

Since my last post, Ive stabilized voltage to 1.36v (1.368v in Cpu-Z), Clocked the ram at 1666.6mhz (its native 1600mhz) @ 1.60v. Which I hear is decent because this corsair vengeance memory doesn't like to be overclocked apparently. Going to work on getting the the ram voltage down some more.

I'm now in the top 20 (#19 actually) of this CPU on passmark.com with very little effort.

What can explain my loss of ~5% ssd performance after overclock?

Also I can achieve similar stable overclocks by raising the multiplier and lowering the BCLK however that lowers my QPI Link speed. What is the ideal combination I'm looking for?

High BCLK - Low multiplier Thus keeping QPI link above 5000mhz
or
Lower BCLK - Higher Multiplier Thus reducing QPI below 5000mhz


Thanks for the help guys, and HOMECINEMA-PC = God + too much time on his hands smile.gif
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post #1687 of 6506
Another question. I really like the temps at idle when using speed step (~30-32c). When overclocked ~4500mhz I can't seem to get Speed Step to take over and lower the voltage and clock speed. Works fine in stock mode, but as soon as I clock higher, it doesn't work. I even tried manually clocking to the stock speed (100x36) and using offset mode to control the voltage, and speed step works at that point. It seems when I raise the voltage beyond ~1.25 its like speed step doesnt work.

When I say it doesnt work, it DOES down clock the processor but not the voltage.

Right now Im running 125x35 = 4,375mhz @ 1.352v , I can see as I type this at idle it drops to 125x12 = 1,500mhz @ 1.352v.

Yes I am using offset mode to control voltage, everything else is set to auto
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post #1688 of 6506
When you're using CPU Strap, the voltage only go down a little when idle. When I tested this before, it only go down ~0.01V. See here: http://www.overclock.net/t/1221208/i7-3820-overclock/1100#post_17815713

Also the idle frequency (LFM mode) no longer 1200MHz but 1500MHz (lowest multiplier = x12, BCLK STRAP = 125 ==> 12 * 125 = 1500MHz). The "higher" voltage when idle most probably to compensate the higher BCLK STRAP. To get the most of the Speedstep advantage, I use multiplier to overclock; BCLK = 105 & multiplier = x43 for 4.5GHz. When idle voltage go down to 1.0xxV & idle temp is better. However, if you want to overclock more than 4.5GHz, I recommend using STRAP.

For BCLK overclocking, most CPU only capable of 5 to 10% variation for PCIe/DMI. The only bad can happen if you overclock BCLK higher is your computer become unstable, that's all. It only indication you overclock too high. It won't fried your hardware. I've overclocked BCLK on my previous computers almost 25% than original BCLK. It running fine without any problem.
Edited by kizwan - 12/11/12 at 6:14pm
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post #1689 of 6506
Quote:
Originally Posted by kizwan View Post

When you're using CPU Strap, the voltage only go down a little when idle. When I tested this before, it only go down ~0.01V. See here: http://www.overclock.net/t/1221208/i7-3820-overclock/1100#post_17815713
Also the idle frequency (LFM mode) no longer 1200MHz but 1500MHz (lowest multiplier = x12, BCLK STRAP = 125 ==> 12 * 125 = 1500MHz). The "higher" voltage when idle most probably to compensate the higher BCLK STRAP. To get the most of the Speedstep advantage, I use multiplier to overclock; BCLK = 105 & multiplier = x43 for 4.5GHz. When idle voltage go down to 1.0xxV & idle temp is better. However, if you want to overclock more than 4.5GHz, I recommend using STRAP.
For BCLK overclocking, most CPU only capable of 5 to 10% variation for PCIe/DMI. The only bad can happen if you overclock BCLK higher is your computer become unstable, that's all. It only indication you overclock too high. It won't fried your hardware. I've overclocked BCLK on my previous computers almost 25% than original BCLK. It running fine without any problem.

I see. I have my CPU strap set to 125mhz, my BCLK set to 125 and my multiplier at 36 giving me 4.5ghz stable @ 1.352v (under load) 1.36 idle.

So because Im using such a high BCLK that's why I cant get the voltage to go down at idle? When using the higher BCLK the QPI Link runs at 5000mhz, I get about 5-8% better benchmarks this way.

Are you using offset mode to control voltage?
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post #1690 of 6506
Quote:
Originally Posted by theJaybo View Post

So because Im using such a high BCLK that's why I cant get the voltage to go down at idle?
Yes, I suspect it is, to compensate higher BCLK STRAP.

I'm using offset voltage, +0.04 (STRAP=AUTO, BCLK=105, multiplier=43). When using CPU Strap (CPU Strap=125, multiplier=37), offset voltage is +0.33.
Edited by kizwan - 12/11/12 at 7:07pm
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