Phenom II 965 3,4GHz Bottleneck with 7950

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Solution
Wisecracker
It's easier to use than explain :lol:

AMD power management is done via P-States. It's simply a combination of CPU multipliers and voltages. The board I tweaked over the weekend is so old is didn't offer all the P-States! It was obvious that the mobo was adding a +0.025 bump to the VCore (not uncommon) so I started at the highest state, set the lowest state, and simply split the difference in the middle states ...

P0 - 18.5x / 1.325v ... IMC/NB 1.1875v (max watts reported: 114w)
P1 - 12x / roughly 1.225v ... IMC/NB 1.15v
P2 - 8x / roughly 1.125v ... IMC/NB 1.1v
P3 - 4x / 0.875v ... IMC/NB 1.0875v (max watts reported: 11w)
P4 - (used same as P3 since mobo had no 5th P-State)

I used HWMonitor to check the power draw and...
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delmetor

delmetor

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Jan 17, 2013
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I have a Bulldozer X6 at 3.6Ghz in turbo and a Sapphire Vapor-X HD 7950 and i play Crysis 3 maxed with MSAA high (x8) and it works like a charm.

Besides, you can always overclock.

So, in my opinion: don't doubt it.
 
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G

georgewesker97

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Jul 1, 2013
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The thing is that OCing with my setup is not so wise I reach 65 degrees in demanding games and 40 degrees idle, I have a CM TX3 cooler, but my case doesnt have any fans, so you think the bottleneck would be minor on stock or 3,6? Is CM 600W enough for it and can it fit into ATX-4730D microlab (asking just in case I spend 270e and it doesnt fit :D ).
 
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T

TheGamersUninvited

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Jun 26, 2013
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If you really want to know, google HWinfo64 (or 32 if you use 32-bits, but I guess you don't). This will keep a record of all sensors and loads on your CPU and GPU. You could even configure it with MSI AfterBurner software to display the numbers ingame. If you let that run in the background for a session of gaming you can look up what the max load was on the GPU/CPU cores and see what's really bottlenecking your systems. It could be that your GPU load never exceeds 50% and some cores on your CPU are sticking around 100% all the time then you know for sure your CPU is the problem. Also the other way around. Hopefully you can figure out the software itself it's not that hard. If you want to display it ingame there is a tutorial here: http://www.overclock.net/t/1229915/how-to-cpu-and-gpu-usage-along-with-fps-in-game
 
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Wisecracker

Wisecracker

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Jan 15, 2007
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At what volts? More volts = more heat.

Here's the deal: Mobo OEMs have a melt down when they see a 125w PhII 965BE, thinking folks will over-volt and over-clock it. Fact is, a C3 PhII 965BE will take a nice over-clock with an under-volt. The under-volt helps keep your temps at load below 60c.

I did it (again) this past weekend with a 965BE. The motherboard wanted to lock the volts at 1.425v and this drove temps beyond 60c at load. I used PhenomMSR Tweaker to set the multi at full load to 18.5x and 1.325v (IMC/NB at 1.1875v 2400MHz) ... Under 100% load I was pulling 114w and 1.35v (mobo still volted me +0.025v)

Temps never went above 59c under 100% stress load :)





 
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Wisecracker

Wisecracker

Splendid
Jan 15, 2007
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31,965
It's easier to use than explain :lol:

AMD power management is done via P-States. It's simply a combination of CPU multipliers and voltages. The board I tweaked over the weekend is so old is didn't offer all the P-States! It was obvious that the mobo was adding a +0.025 bump to the VCore (not uncommon) so I started at the highest state, set the lowest state, and simply split the difference in the middle states ...

P0 - 18.5x / 1.325v ... IMC/NB 1.1875v (max watts reported: 114w)
P1 - 12x / roughly 1.225v ... IMC/NB 1.15v
P2 - 8x / roughly 1.125v ... IMC/NB 1.1v
P3 - 4x / 0.875v ... IMC/NB 1.0875v (max watts reported: 11w)
P4 - (used same as P3 since mobo had no 5th P-State)

I used HWMonitor to check the power draw and monitor temps. At idle was 28c (with stock cooler).

I choose 0.0875v for the lowest P-State as I knew it as AMD spec on the low end for the chip. I've gone lower with no real issue other than blue-screening coming out of sleep, but I doubt you could realistically go below 0.825v with a Deneb.

You can lock the P-States in under the service menu (I think he still calls it that ... )


edit .... I fergit

I started the P0 state at 1.3875v (and 17x) simply walked the voltages back while working the CPU multiplier ... as far as I know, I could go 19x at 1.3v! (plus my mobo +0.025v volt bump).

I'll have to check that when I get back to the poor house :D

 
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Solution
Wisecracker

Wisecracker

Splendid
Jan 15, 2007
8,106
17
31,965
Good job. How's that HD7950 working out for you?

I settled at P0 - 19x / 1.3v ... IMC/NB 1.15v.

Never went above 61C at 1.3125v (AMD spec is 62C) under 100% load. I was able to dial it back another notch and drop temps to 58C.

HTPC_Fox790FX_load_1-3125v_05.png


While stressing I like to record a video capture just to be on the safe side :lol: It was smooth sailing ... nary a hiccup!



 
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