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OPTIMUM VOLTAGE FOR 4 GHz ON AMD Phenom II X6

post #1 of 22
Thread Starter 
Hey guys-I have la petit experience of overclocking both from the BIOS and the limited FSB overclocking......
This time I have a phenon ii x6 1055t on an msi 890gx-g65 motherboard
2X 2GB corsair XMS 3 1600 MHz ram sticks


would someone help me with the voltage settings for CPU, FSB and RAM....
I am limited by 14x multiplier, so I have to take the FSB to 286 MHz for my cpu to reach 4 GHz.........
thanx
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Azazel I
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post #2 of 22
First, you should not overclock at all with that motherboard. It has a very high failure rate with x6 processors.

Second, with stock cooling you will not be able to hit 4GHZ.

.........

But to answer your questions:

CPU voltage (vCore) required for 4GHZ will be different for every chip. Start at 1.4v and start uping it by 0.01v untill you can boot into Windows and run stress tests without bluescreening or having workers fail for a few hours. Limit is 1.55v, but with stock cooling you won't be able to run anywhere near that.

Then start backing it down by 0.001v to find your lowest stable voltage and then finish off with a minimum of 12HRS in Prime95 to insure no data corruption is possible and that your system is truly stable. When running stress tests, watch your "Core Temp" and keep it under 62C or 60C for extended periods. If it gets close to that, shut it down.

RAM voltage should be set manually in BIOS to the spec from Corsair. That voltage should be listed on the label on the side of your RAM, but you can also find this info online.

See this guide for more information:

Phenom II Overclocking Guide

Hope that helps.
Edited by ALUCARDVPR - 11/8/11 at 7:52pm
post #3 of 22
Yes very different with every CPU... I have to run 1.525 to get 4.1ghz, and alucard only runs 1.476 to get 4.5ghz.
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post #4 of 22
Thread Starter 
I suppose I should disable a core or two to hit 4 GHz on stock cooling........
I mean it would bring down the TDP............and I wont mind doing 4 GHz on a 4 corer-
4 cores@4 would be better than 6 cores@2.8 for single or lightly threaded applications-RIGHT?

My only fear is that I would end up frying my northbridge trying to hit 286 MHz......

As for the RAM, corsair says"SPD voltage=1.5V,SPD speed=1333 MHz, tested voltage=1.65V, tested speed=1600 MHz"
Q1 would 1.65 V be sufficient for 1800 MHz or at least 1600+MHz, is doing over 1.65 dangerous??
AND
Q2 What the hell is an SPD???
Azazel I
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Azazel I
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post #5 of 22
First, get a new mobo...

You can change your CPU/nb multi independently of your CPU, so you would lower that to keep the CPU/nb in check.

On the ram side, I have mine running at 1766 at 1.65v with no issues, but mine has an xmp profile for 2000 MHz, which doesn't really mean much... I wouldn't go over 1.65 on the ram unless you were overclocking it and had memtest errors or something. SPD is how your motherboard knows what the ram's specification is.

But seriously you should not oc on your mobo. I have read lots of people talking about failures on those.
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post #6 of 22
Thread Starter 
I can't do that-buy a new mobo............
i was asking about the heating and related issues if i cross the 1.65 volt mark........
xms3 has areally basic heatsink on nonetheless.

wouldn't multiplier overclocking turn the FSB into a bottleneck??

And why do so many people object to FSB overclocking??
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Azazel I
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post #7 of 22
Quote:
Originally Posted by OverRide93 View Post
I can't do that-buy a new mobo............
i was asking about the heating and related issues if i cross the 1.65 volt mark........
xms3 has areally basic heatsink on nonetheless.

wouldn't multiplier overclocking turn the FSB into a bottleneck??

And why do so many people object to FSB overclocking??
You're not getting far on stock cooling

Your motherboard will fail/explode if you overclock much

No DDR3 will have heat issues

The FSB doesn't actually exist anymore; people erroneously refer to the BCLK as the FSB in casual conversation

Multi overclocking is easier to do and easier to stabilize
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post #8 of 22
That board is prone to failures period - not just on x6 procs. It's due to the ultra low quality, low count VRM design. Overclocking at all on those boards is like playing in the street blind-folded while playing Russian roulette, yet people still do it, and they still fail all the time. Good luck, save your pennies, and get another mobo.
post #9 of 22
There is no optimum voltage each chip is different.
Some will do 4ghz easy on 1.40V, Others will have a hard time and need to use 1.50V+

The average iv seen seems to be around the 1.43-1.48 range to get 4ghz stable.
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post #10 of 22
i could swear i just read that his motherboard is OK for overclocking..i dunno..check out the "am3+ motherboard info list" am3 mobos are in the spreadsheet underneath..as far as voltage..i'd push the northbridge..up to 1.4-ish if needed..cpu-nb..up to 1.375..cpu i'd go up to 1.1,000,000 (as long as it stays under 57c)
 
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