RX 480 Results

AgentB
AgentB
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RE: The penguins are

Quote:

The penguins are certainly working hard for me but my Linux results remain very, very different from yours.
I'm unsure as to what to do now.

Return the card or not?

My i5
Intel(R) Core(TM) i5-4690K CPU @ 3.50GHz
Measured floating point speed 5983.62 million ops/sec
Measured integer speed 100713.33 million ops/sec

your i7
Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz
Measured floating point speed 2846.64 million ops/sec
Measured integer speed 16464.43 million ops/sec

So there should be a difference.

Are you running x1 ?

Edit: also you are running a Sapphire, where i am running XFX - so we may be hitting slight subtleties in cooling or factory clock settings.

Gavin
Gavin
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RE: Are you running x1

Quote:
Are you running x1 ?


Running x3 during this test.

Quoting myself here:

Quote:
The penguins are certainly working hard for me but my Linux results remain very, very different from yours.
I'm unsure as to what to do now.


I misread your earlier runtime reports and started thinking the worst (Ooops!), I'm actually not far off your mark on a per work unit basis.

After our combined tests today it's clear that my card WILL run more than x2 albeit under Linux and your card continues to run 3 or above under Win 10.

Tomorrow will entail wiping my SSD and starting from scratch with Win 10 (I'm more comfortable using Windows) but I suppose that if all else fails I have my Kubuntu installation to fall back on to get the most out of the 480.

Thank you AgentB / Winston Wolf for all your help today :-)

Gav.

AgentB
AgentB
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RE: RE: Are you running

Quote:
Quote:
Are you running x1 ?

Running x3 during this test.


OK those results are close enough - i'm running DDR3 at 1866 MHz and a slight over clock on the CPU.

Quote:

Tomorrow will entail wiping my SSD and starting from scratch with Win 10 (I'm more comfortable using Windows) but I suppose that if all else fails I have my Kubuntu installation to fall back on to get the most out of the 480.


I'd be thinking down-clocking to get it stable. Even on Winston's short run it was never consistent times, and always drawing more power.

For a new driver (goodbye fgrlx hello amdgpu) on new hardware on linux, i was expecting it to be very unstable, but apart from the occasional black screen (which does not affect crunching) and filling up a log file, it has been exceptionally stable, not a single error or invalid, even doing unusual things (x8). If it would be 20% faster - i'd be very happy, but crunching needs to be reliable first then fast.

Quote:

Thank you AgentB / Winston Wolf for all your help today :-)

I wasn't there Gav, i wasn't there.

AgentB
AgentB
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Credit: 513,211,304
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RE: RE: Start with

Quote:
Quote:
Start with sensors and lm-sensors

Perfect!
I'm getting a reading of 79C which is surprising given how cool to the touch this card is... I don't suppose you've found a method to adjust fan speed or

Some more tips - this

# cd /sys/kernel/debug/dri/64/
# cat amdgpu_pm_info

[ mclk ]: 2000 MHz
[ sclk ]: 1288 MHz

[GPU load]: 100%

uvd disabled
vce disabled


shows the gpu clocks and load be careful with what you do in that directory.

The black screens can be recovered with

# kill -hup

I might try CtrlAltF1 next time it happens - I forget that is now working with amdgpu (was badly broken with fgrlx) - yay.

Gavin
Gavin
Joined: 21 Sep 10
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Credit: 34,893,056,799
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RE: RE: RE: Are you

Quote:
Quote:
Quote:
Are you running x1 ?

Running x3 during this test.

OK those results are close enough - i'm running DDR3 at 1866 MHz and a slight over clock on the CPU.


Ditto with the memory speed but my CPU was running stock with speedstep and C-states in full effect. This is something I will address if I decide to keep the machine running Linux.

Quote:
Quote:

Tomorrow will entail wiping my SSD and starting from scratch with Win 10 (I'm more comfortable using Windows) but I suppose that if all else fails I have my Kubuntu installation to fall back on to get the most out of the 480.

I'd be thinking down-clocking to get it stable. Even on Winston's short run it was never consistent times, and always drawing more power.


I did the deed this morning and started with a fresh install of Win 7 Pro before doing a couple of runs at x3 with the 280X to prove all was working correctly. Testing with the RX480 at x3 has now started, the first run has so far made it to 53% completion without issue... I have not messed around in Wattman this time setting temp targets and fan speed so temps are high by my standards at 80C. Average GPU load at x3 is 96% and average GPU power draw is 101.5 Watts.
If I do encounter a recurrence of my previous issue, the underclocking route may help but if that's the case I really would consider returning the card for replacement.

Quote:

Some more tips - this

# cd /sys/kernel/debug/dri/64/
# cat amdgpu_pm_info

[ mclk ]: 2000 MHz
[ sclk ]: 1288 MHz

[GPU load]: 100%

uvd disabled
vce disabled

shows the gpu clocks and load be careful with what you do in that directory.

The black screens can be recovered with

# kill -hup

I might try CtrlAltF1 next time it happens - I forget that is now working with amdgpu (was badly broken with fgrlx) - yay.


Very useful information. Thank you.

Gav.

P.S.
Testing resumed with the machine back under my main account here

ExtraTerrestrial Apes
ExtraTerrestria...
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RE: it has been

Quote:
it has been exceptionally stable


That's the benefit of AMD not changing the architecture much ;)

MrS

Scanning for our furry friends since Jan 2002

Gavin
Gavin
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Looks like the OS re-install

Looks like the OS re-install did the trick. Even the subsequent upgrade to Win 10 allowed the card to continue crunching at x3 (although the move from 7 to 10 required me to install the drivers again).
No errors or invalids. Crunch times fluctuate in line with what Winston saw with Windows.

The machine is currently shut down due to the heatwave Britain is experiencing and as a result the GPU temp climbed to 85C, which is probably within the manufacturer tolerance for 56% fanspeed but is far too high for my liking!

Running under Linux appears to give better results and may well be the sensible way forward, however my ultimate goal included me using this card in a multi GPU config. with a 280X... GPU's below Tonga class are not supported by the 480's needed amd_gpu-pro driver for Linux. So I will be staying with Microsoft for this machine.

I apologise for suspecting that my RX480 may be faulty, tbret was most likely correct about the driver needing a truly clean install and I tried my best to achieve that, unsuccessfully maybe. Whatever the real cause of my issue remains as yet unknown. I have done some quiet offline testing of the 480 in several of my Windows hosts and all have hit the stall point. Windows or driver? time will tell.

Quote:
Quote:
it has been exceptionally stable

That's the benefit of AMD not changing the architecture much ;)

Not sure what you are trying to say here ETA.

Is it not better to try and improve the wheel rather than try to re-invent it?

Gav.

ExtraTerrestrial Apes
ExtraTerrestria...
Joined: 10 Nov 04
Posts: 770
Credit: 360,612,401
RAC: 682,856

RE: The machine is

Quote:
The machine is currently shut down due to the heatwave Britain is experiencing and as a result the GPU temp climbed to 85C, which is probably within the manufacturer tolerance for 56% fanspeed but is far too high for my liking!


I'd rather lower the cards power limit than have it idle completely. 20 to 30 W less should be able to bring it down to 70 - 75°C at the same fan rpm.

Quote:
Quote:
That's the benefit of AMD not changing the architecture much ;)

Not sure what you are trying to say here ETA.

Is it not better to try and improve the wheel rather than try to re-invent it?


That depends on how round your wheel already is. To stick with that example and applying it to GPU power efficiency: with GCN AMD moved from a triangular wheel to a rectangular. Over a few years (GCN 1.0, 1.1 and 1.2) AMD smoothed things out a bit by moving to a quadratic wheel. Now with GCN 4 they have improved things a bit and moved to a pentagon, giving a slightly smoother ride. Meanwhile nVidia had made their wheel round with Maxwell and have now outfitted it with a rubber skin and air tube.

I'm not really saying AMDs engineering is as crude as this, but architecturally there has only been minor progress at AMD since the initial GCN launch, whereas nVidia went from Kepler (technically already more efficient than GCN, but sold more expensively) to Maxwell and now Pascal.

MrS

Scanning for our furry friends since Jan 2002

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