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Author Topic: Dummy Plugs/ Multiple GPUs  (Read 29551 times)
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June 23, 2011, 10:00:46 AM

how did you measure the 1%?

I guess I should have just stated the overall hash rate increase,

350 -> 356

300 -> 304

obviously the increase is because the gpu no longer has to render the desktop
I did a measurement on the influence of the dummy plugs on hashrate. Result: No significant influence (-0.7% with plugs removed).

Measurement: 3 5850 cards. Two miners on each card summed up. Two measurements before removal of plugs, two measurements after. Phoenix with flag -a 128 for measurement averaging. Waiting time between measurements ~2 min.

I am quite reliefed that with this result I do not have to look for a way to make the cards work without dummy plugs on win xp. ■ bitcointalk top posts
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June 23, 2011, 12:53:33 PM

--delete please--

NSW, Australia - Rigs, Mining, Pools - Local help needed? Send me a message!
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June 24, 2011, 04:09:50 AM

I'm running WinXP x64 and 2x 6970's

I have tried dummy plugs, but can't get the second card to go active.

This is what I tried:

Even tried this:

No luck on either, any ideas on what else I can try?

Figured it out, you have to extend your desktop on the other card.
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April 29, 2013, 07:38:36 PM

Here's what I did

I have 2 7970 and a onboard video card.

At first I was using one of my 7970 HDMI to mine/browse on my computer, but I did notice it effect my harsh rate a bit (jumpy at 620kh/s - 580kh/s ish when I load stuff). So I was thinking maybe I should use my onboard video card to display instead, but when I switch the hdmi cable to my onboard, system wasn't detecting the 2 7970.

So I found a way to mine with my 2 7970 without effecting my harshrate and continue to browse on the internet with stable harshrate and without using a dummy plugs either.

1 HDMI from onboard to monitor, 1 DVI to vga from 1 7970 to the same monitor.

Set onboard screen as main, and 7970 as extend. Done (You can't just use 1 montior or it won't detect the 7970.)

Harshrate is stable at 620kh/s even when I load 5 tabs on chrome.

I am not sure if my 7970 will harsh even higher if it didn't have to render the extended screen. Might switch the DVI cable to my other 7970 to find that out.

Update: (It does not effect the harshrate unless you have something on that screen.)

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April 29, 2013, 09:24:02 PM

You didn't notice this was a 2 year old thread, right?

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April 29, 2013, 09:25:02 PM

Well if I did I wouldn't post now right? Tongue

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