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Undervolt AMD GPUS for better efficiency per Watt exmaple R7 260X GCN 1.1

post #1 of 3
Thread Starter 
In most time I put GPUs to max performance regardless to power draw but toady my brother ask me to to decrease power draw from his Gigabyte R7 260X 1GB because for him this GPU is enough strong wink.gif

I Checked Power Draw under Furmark by GPU-Z at stock setting core 1075 average power draw was 93W temp 77C after -100mv and reducing core to 1060 *( 0,99-1V)power draw decrees to 65W temp 65C and was stable in few tested games I really surprise how little performance 1,3% clocks he lose compared to reducing power consumption by 28W.
In opposite my Club 3D series 13 7790 @1345 +80mv under furmark draw 140W 76C this more than 2x power draw for less than 30% better clock rolleyes.gif I try under-clock my GPU but under 2D I have instant freeze mad.gif* using bios from Asus 7790.

How looks your experience with achieving better performance per watt ?
Edited by Rabit - 7/29/16 at 10:11am
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post #2 of 3
Hi,
I have similar experiences myself. I find it more fun to find the optimimal performance/efficiency spot. I'm using a R9 Nano right now, and running it att 900 mhz, and some undervolting. Unfortunatly I cannot read the wattage, as I don't have the tools.
But it's nice that the GPU fans runs cool most of the time biggrin.gif

Before my Nano I was using a 280X, and I made the following chart when running Furmark. Not totally scientific, but it gives a hint of what you could expect by changing the clocks. wink.gif
http://imgur.com/a/bWWJH
post #3 of 3
Thread Starter 
Quote:
Originally Posted by Flash831 View Post

Unfortunatly I cannot read the wattage, as I don't have the tools.
But it's nice that the GPU fans runs cool most of the time biggrin.gif

To read GPU core power draw you no need tools you can use free software GPU-Z
Link: https://www.techpowerup.com/gpuz/
For real power draw add 10-15W PCB ans memory power draw thumb.gif
This is also helpful to check GPU memory controller load if pass 90% during games you really want to OC memory a bit wink.gif

Edit:

After some more tests I set My brother R7 260X at 1,04V to improve stability power draw furmark 78W in games 59W

And my 7790

1345 at 1,19V (+80Mv) GPU-Z in Furmark reach 140W in games 120W

after some more advance tweaks I can pass it but this is enough wink.gif

and I still use it and I do not want damage it and I hear weird sound from VRM at 1,19V under load in Furamrk wink.gif

chip quality by GPU-Z ASIC 74,7
I also use low power setup
1060 at 1,05V ( -60mv) power drawn in Furmark 84W in games 65W *

And looks like I have still some room for OC if my VRM section do not blow up rolleyes.gif

Max Voltages for GCN:
Air - 1,3V must not pass 85C
Water - 1,4V must not pass 60C
Edited by Rabit - 8/8/16 at 11:44pm
Cheap VR bulid :)
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Windows 10 AOC 2236Swa Techno-X Silentium Deus M1 550W 
CaseMouseMouse PadOther
Aerocool GT Advance Case Maxtek mouse China cheap :P Sharkoon Shark Zone H40 
CPUMotherboardGraphicsRAM
X4 860k ASUS A88XM-A Club 3d Series 13 7790 Corsair CMZ8GX3M2A1600C8R 
Hard DriveHard DriveOptical DriveCooling
Samsung HD502HJ 500GB ADATA SP550 LG GH22LS50 Scythe Mugen 
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Cheap VR bulid :)
(16 items)
 
   
CPUMotherboardGraphicsRAM
i5 3470 @ 4Ghz P67A-GD65 (B3) Gtx 970 Windforce Hynix HMT351U6BFR8C-H9 
Hard DriveHard DriveHard DriveCooling
ADATA SP550 Samsung HD502HJ 500GB ocz vertex 2 Zalman CNPS 10X Quiet 
OSMonitorKeyboardPower
Windows 10 AOC 2236Swa Techno-X Silentium Deus M1 550W 
CaseMouseMouse PadOther
Aerocool GT Advance Case Maxtek mouse China cheap :P Sharkoon Shark Zone H40 
CPUMotherboardGraphicsRAM
X4 860k ASUS A88XM-A Club 3d Series 13 7790 Corsair CMZ8GX3M2A1600C8R 
Hard DriveHard DriveOptical DriveCooling
Samsung HD502HJ 500GB ADATA SP550 LG GH22LS50 Scythe Mugen 
OSMonitorPower
Windows 7 Home 64 LG Flatron E2242 Silentium Deus M1 550W 
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