Message boards :
Number crunching :
Power requirements for GPUs
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Author | Message |
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Mamluk Send message Joined: 10 Sep 09 Posts: 80 Credit: 2,448,048 RAC: 0 |
@Sutaru or anyone else...
If I look at the power consumption specs of Sutaru's hosts, I would have expected the power consumption to be more than 1.08 kWh. Do the GPU cards (even OCed ones) at 100% usage use less when they are not driving monitors, but crunching WUs only? |
Sutaru Tsureku Send message Joined: 6 Apr 07 Posts: 7105 Credit: 147,663,825 RAC: 5 |
From my experiences.. a graphic card which calculate CUDA use 3/4 of the max. wattage consumption which the manufacturer say. I can say it only for my manufacturer OCed GTX260-216. The manufacturer say max. ~ 200 W. This would mean ~ 150 W for 'only' CUDA. The 100 % wattage take the GPU if high gaming. At my GPU cruncher only on the first GPU the display is connected. At the other 3 GPUs nothing connected. Also not the WindowsDesktop extended. (WinXP) With WinVista this is different. You need for example 'display dummies' connected to all GPUs. |
Mamluk Send message Joined: 10 Sep 09 Posts: 80 Credit: 2,448,048 RAC: 0 |
Thank you... |
[KWSN]John Galt 007 Send message Joined: 9 Nov 99 Posts: 2444 Credit: 25,086,197 RAC: 0 |
Just FYI...I have 2 GTX260s, factory OCed to 655, running on a single rail Corsair 650, XP x64, Q6600, and I ran it fully loaded at SETI a bit back... http://setiathome.berkeley.edu/show_host_detail.php?hostid=4175668 Clk2HlpSetiCty:::PayIt4ward |
Sutaru Tsureku Send message Joined: 6 Apr 07 Posts: 7105 Credit: 147,663,825 RAC: 5 |
Mamluk, you are welcome. BTW. I don't know if a GPU need more or less wattage if a display is connected. I guess - no. But normally you should enable 'go to black screen' if the PC is not in use. No screen saver. Then the display go in stand-by and use less wattage. Normally then also the GPU should use less wattage, but with my old nVIDIA 6200 LE I couldn't see this. Or it was to low to notice it. I didn't made this test with the GPU cruncher. |
Mamluk Send message Joined: 10 Sep 09 Posts: 80 Credit: 2,448,048 RAC: 0 |
I don't intend to have any display connected at all. I will use RDC to the box. I also don't think that driving a monitor will add too much to power consumption, but presumably there will be parts of the GPU that will not be used if a GPU is not driving a monitor/monitors. |
Sutaru Tsureku Send message Joined: 6 Apr 07 Posts: 7105 Credit: 147,663,825 RAC: 5 |
Ohh.. yes.. I need my second coffee for the day.. I made this test with my other.. QX6700 PC.. After 'go to black screen' the PC didn't used less wattage. OCed QX6700 with OCed GTX260-216 and 6200 LE. In this test 4x MB and 1x CUDA (full load). But you can't see this really (if less wattage or not if 'black screen'), because if at full load the wattage vary ~ 10 W in short term and have sometimes also + ~ 25 W peaks. |
Mamluk Send message Joined: 10 Sep 09 Posts: 80 Credit: 2,448,048 RAC: 0 |
What is this? |
Wembley Send message Joined: 16 Sep 09 Posts: 429 Credit: 1,844,293 RAC: 0 |
I don't intend to have any display connected at all. I will use RDC to the box. I also don't think that driving a monitor will add too much to power consumption, but presumably there will be parts of the GPU that will not be used if a GPU is not driving a monitor/monitors. Just remember that Microsoft's Remote Desktop shuts down the GPU when you connect to the machine. |
Link Send message Joined: 18 Sep 03 Posts: 834 Credit: 1,807,369 RAC: 0 |
Here you have a review about the real power consumption of graphics cards: http://ht4u.net/reviews/2009/power_consumption_graphics/. And that's not necessarily what the manufacurer say or even what the card is allowed to draw out of the different cables. |
Mamluk Send message Joined: 10 Sep 09 Posts: 80 Credit: 2,448,048 RAC: 0 |
I don't intend to have any display connected at all. I will use RDC to the box. I also don't think that driving a monitor will add too much to power consumption, but presumably there will be parts of the GPU that will not be used if a GPU is not driving a monitor/monitors. Thank you. Will the GPU reenable itself when the remote connection is terminated? Does this apply to all 8 GPUs? |
Jord Send message Joined: 9 Jun 99 Posts: 15184 Credit: 4,362,181 RAC: 3 |
Yes and yes. |
Sutaru Tsureku Send message Joined: 6 Apr 07 Posts: 7105 Credit: 147,663,825 RAC: 5 |
'Display dummies' can be special bought plugs for your GPU, but AFAIK also the adaptors which are also in the GPU box for to plug in VGA <-> DVI-I. AFAIK, WinVista need a display connected to every GPU for CUDA. So for to fake there are displays connected you can use 'display dummies'. |
Jord Send message Joined: 9 Jun 99 Posts: 15184 Credit: 4,362,181 RAC: 3 |
They're called VGA dummies and that's exactly what they are. They can be made by anyone who can wield a soldering iron. See here for instance, or just fill in VGA dummy in your search engine of choice. |
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