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 Post subject: Undervolting Athlon II X4 630
PostPosted: Fri Aug 30, 2013 6:59 pm 
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Location: London
Having failed miserably to overclock this CPU on my Asrock 880GMH/U3S3 board viewtopic.php?f=28&t=62817&p=577294#p577294 I've now decided to undervolt it instead. As it will be only serving media files to a RPi sometimes, it seems to make sense to have it run at as low-power as possible when idle.

Using PhenomMSRTweaker, I've tested with it locked to 4x (800Mhz) which is the lowest multiplier available and set it to 1.0v (down from 1.1v) and that seems stable and also tested at 8x (1600Mhz) at 1.1v (down from 1.2v) and that seems OK too. I haven't properly stability tested yet though and was wondering whether tools like IntelBurnTest are still valid for testing when locked to lower frequencies or if they're only any use at full speed?

At full 2.8Ghz, what voltage am I likely to be able to lower the VID to, from the default 1.4v (1.368v Vcore) and what am I likely to be able to get down to at 800Mhz and 1600Mhz?

Is there any scope for lowering the NB VID from the default 1.175v and is that likely to confer any significant power savings or is that rather minor compared to the CPU v?

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 Post subject: Re: Undervolting Athlon II X4 630
PostPosted: Fri Aug 30, 2013 7:23 pm 
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Joined: Mon Dec 28, 2009 1:42 am
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Location: Australia
I just use Catalyst Control Centre.


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 Post subject: Re: Undervolting Athlon II X4 630
PostPosted: Sat Aug 31, 2013 10:27 am 
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Joined: Sat May 20, 2006 3:38 am
Posts: 43
Location: Free Union, VA, USA
fwiw, I have everything in BIOS at "default" and use K10Stat for all settings. At my P3 state in K10Stat, I have:

CPU Volt: .75
NB Volt: 1.0125

I could probably go lower with the NB, but I've been running this config for years and it's just rock solid.

I've used PMSRT also, works the same, I just like interface for K10Stat better. You can also try TurionPowerControl (on AMDZone.com), it's amazingly flexible, but all command line.


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 Post subject: Re: Undervolting Athlon II X4 630
PostPosted: Sat Aug 31, 2013 11:24 am 
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Joined: Mon Jan 29, 2007 10:30 am
Posts: 838
Location: London
noee wrote:
fwiw, I have everything in BIOS at "default" and use K10Stat for all settings. At my P3 state in K10Stat, I have:

CPU Volt: .75
NB Volt: 1.0125

I could probably go lower with the NB, but I've been running this config for years and it's just rock solid.

I've used PMSRT also, works the same, I just like interface for K10Stat better. You can also try TurionPowerControl (on AMDZone.com), it's amazingly flexible, but all command line.


Thanks. I'll leave everything at default in BIOS then and just use PMSRT to adjust.

At the moment I'm using 0.95v (down from 1.1v) for the CPU at P3 (800Mhz) but I'm sure it can go lower. For P0 (2800Mhz) I've tested

Idle: CPU 37, Core 26, MB 41

at VID 1.40 (default)
IntelBurnTest (Standard, 5 runs): CPU 55, Core 45, MB 43

at VID 1.35
IBT (Standard): CPU 52, Core 44, MB 44

at VID 1.30
IBT (Standard): CPU 51, Core 41, MB 43

at VID 1.25
IBT (Standard): CPU 49, Core 40, MB 42

So there's a nice reduction in temps (and of course energy) with each decrease.

P2 (1600Mhz) and P1 (2400Mhz) are still at 1.1v and 1.2v (1.2v and 1.3v default) so I need to work out what I can get those down to as well.

I'm not so sure about undervolting the CPU-NB as I'm running 1333Mhz DDR3 and I don't really know what depends on the CPU-NB.

EDIT: At 1.25v it BSOD within seconds of starting OCCT Linpack test, even though it passed IBT (Standard), so I increased it to 1.30v and it seems stable with that.

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Main: Asus Z97-A, i5-4670k@4.4Ghz, Scythe Kotetsu HSF, Corsair Vengeance LP DDR3 4x4GB, eVGA SuperNova G2 750W, Powercolor 6950 2GB GPU, Samsung 840 Evo 256GB SSD, Samsung 2TB and WD 2TB HDDs, Coolermaster HAF XB case

2nd PC: MSI 990FXA-GD80, Phenom II X4 955@3.5Ghz, TRUE Rev. C/Nexus, HD6850 1GB, Yate Loon 140mm intake, Nexus 120mm exhaust, HD103UJ, WD6400AAKS, Nexus Value 430W, Bach VX case


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