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Help with OC my fx 8320 on a extreme4 motherboard - Page 2

post #11 of 25
Quote:
Originally Posted by Farih View Post

Pro advice thumb.gif

Didnt think of undervolting myself, shame on me mad.gif

Don't worry, here it's overclock.net, people are used to overvolting. biggrin.gif But undervolting is a bliss, for everyone who wants "cool and quiet" PC, as well as to users that have hardware with marginal overclocking capabilities.

According to HWInfo, my 8320@4Ghz undervolted, runs at 110,3W at max load and i think this is either 100% accurate or slightly exagerated. So suddenly, a motherboard that is marginal for 125W CPU, needing top down cooler etc, becomes more comfortable. 15W less for a 4+1 phase motherboard, is a big deal. Even for better motherboards, it's a considerable reduction of heat.

The FX has a big margin of undervolting. An average 8320 at stock clock, can undervolt at least to 1.18v. According to my estimates, this brings the chip somewhere in the 95-100W range. Which is remarkable. My 1090T could only drop to 1.23v at stock clocks.

With such wattages, suddenly the FX 8 cores, aren't the heat beasts you read everywhere and you can actually run a PC with case fans at 1000-1200 rpm max, which is virtually silent, while you get a good performance at the same time.

EDIT: The gain of undervolting for the mosfets of a 4+1 motherboard, is actually two fold. 1) It requires less power from them, 2) Beause of point 1, they run cooler and thus with increased efficiency. So overall, you help the mosfets have an easier life.
Edited by Undervolter - 6/9/16 at 11:11am
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post #12 of 25
Interested in this guide. So, so so... i can try to go for 1.31 or .32 don't know.
Well, trying to getting stability with prime at 4 ghz on an fx 8350e (u know the poor mb i've, Msi 970 gaming).
Well, i can pass IBT 10 times on very high. but prime will always fail or crush.
Already done a windows memory test with all settings on and crucials ballistix are fine.

thanks;)
post #13 of 25
Quote:
Originally Posted by TekG View Post

Interested in this guide. So, so so... i can try to go for 1.31 or .32 don't know.
Well, trying to getting stability with prime at 4 ghz on an fx 8350e (u know the poor mb i've, Msi 970 gaming).
Well, i can pass IBT 10 times on very high. but prime will always fail or crush.
Already done a windows memory test with all settings on and crucials ballistix are fine.

thanks;)

Try setting DRAM voltage to 1.6v. You never know...
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post #14 of 25
Quote:
Originally Posted by Undervolter View Post

Try setting DRAM voltage to 1.6v. You never know...
Even if they are rated as 1.5?
And another suggestion, what about Prime in blend mode, it will need any modifications? At the moment i'm running custom prime mode with fft in place for looking the long term stability.
vload on nb should be rised too?

tnx
post #15 of 25
Quote:
Originally Posted by TekG View Post

Even if they are rated as 1.5?
And another suggestion, what about Prime in blend mode, it will need any modifications? At the moment i'm running custom prime mode with fft in place for looking the long term stability.
vload on nb should be rised too?

tnx

There are several Kingston specsheets that are very clear about it, where they say that 1.5v means 1.5-1.575v. I myself have a Corsair 1.5v kit, that will always fail Prime at 1.5v and so i run it at 1.6v. My kit, will fail Prime at 1.5v on 2 different motherboards, by different manufacturers, so it's not a mobo problem and both mobos have actually digital PWM and they give dead right 1.5v. So yes, it can happen that your 1.5v kit needs more.

I like running in place FFTs with 50% RAM in Custom Prime for 10h.

I don't see why nb voltage would have any impact in overclocking.
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post #16 of 25
Quote:
Originally Posted by Undervolter View Post

There are several Kingston specsheets that are very clear about it, where they say that 1.5v means 1.5-1.575v. I myself have a Corsair 1.5v kit, that will always fail Prime at 1.5v and so i run it at 1.6v. My kit, will fail Prime at 1.5v on 2 different motherboards, by different manufacturers, so it's not a mobo problem and both mobos have actually digital PWM and they give dead right 1.5v. So yes, it can happen that your 1.5v kit needs more.

I like running in place FFTs with 50% RAM in Custom Prime for 10h.

I don't see why nb voltage would have any impact in overclocking.
That's right and exaustive. I will let auto on nb settings.
Yesterday i had a windows memory test properly for test my ram, and all is work fine, anyway i'll give them a stress test with Custom prime.
And for testing the cpu i will first go for a blend test, then a custom maybe with some options included in this thread:
http://www.overclock.net/t/838244/prime95-a-quick-dirty-guide-to-the-custom-settings
post #17 of 25
MSI says that for stability issues the first thing one should do is bump the ram volts to 1.6+v. The ram itself can handle up to 1.7 volts.
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post #18 of 25
doh.gif
Quote:
Originally Posted by miklkit View Post

MSI says that for stability issues the first thing one should do is bump the ram volts to 1.6+v. The ram itself can handle up to 1.7 volts.
Really? at the moment i bumped the ram's voltage to 1.51 (before at stock was at 1.488). Could this be a fix for prime stability problems?
post #19 of 25
Ayup. MSI said that on their forum back in 2013. Will it work for you? Try it and see.
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post #20 of 25
Well atm are fixed at 1.55v (instead of 1.488 as xmp set)
Anyway, i will give it a try.
Can ram be damage if i set a 1.6 even if they run at 1.5 with xmp 1600 mhz and cl 8?

Tnx
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