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Why does my computer freeze with two graphics cards installed?

Last response: in Graphics & Displays
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May 27, 2011 4:29:25 PM

I have an ATI 5850 and 5770 installled for my Bitcoin mining rig. When I have both cards plugged in to my monitor (one DVI, the other HDMI) about two minutes after my computer boots up the computer freezes completely. When I unplug the 5770 and boot everything is fine. But once I plug it in my monitor goes black and nothing fixes that until I restart. What could be the problem?

a c 271 U Graphics card
a b C Monitor
May 27, 2011 4:49:24 PM

Why would you have two cards plugged into the same monitor? Have you tried using two monitors?
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May 27, 2011 5:05:44 PM

I don't have two monitors. Bitcoin is an OpenCL function so it requires both cards to be plugged into something. It was working before but for some odd reason it doesn't any more.
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a c 271 U Graphics card
a b C Monitor
May 27, 2011 5:24:34 PM

There is a trick you can do with a resistor but I'm not that well versed up on it, however if you google for the 'fix' that allows ATi cards to be used as a primary card for PhysX you may find it.
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a c 271 U Graphics card
a b C Monitor
May 27, 2011 5:34:58 PM

blindmanwithskill said:
Is that a joke? Funny.

If you take a look at this thread I think you'll get an idea of the kind of mentality that you're dealing with.
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May 27, 2011 5:34:59 PM

I saw that but I was wondering why one day it works and the next it does not. I hope I don't have the same problem if I get another 5850.
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May 27, 2011 5:54:43 PM

May be ur psu not providing enough juice when both of them come together
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May 27, 2011 6:01:11 PM

Repeat: My PSU (Corsair 650TX) ran this setup. It ran for over 24 hours. Are being powered regardless but I cannot plug my 5770 into my monitor. I have read the 650TX can run 2x 5850's with room to spare so my PSU should not be the problem. Sometimes I get a blue screen report upon reboot. Error 117. All I know is that has to do with the GPU.
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May 27, 2011 6:19:39 PM

CrossfireX is generally only supposed to be used with two identical cards, regardless of their compatibility with the crossfirex setup. So either two 5850's or two 5770's. They don't mix well since they generally require different drivers.
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May 27, 2011 6:21:05 PM

If u have dual channel Ram chips, pull one out , pull out cmos battery, wait for 10 seconds, put cmos battery, boot with just one ram installed, test for abt some hours, if it works fine then put other ram... Good Luck ;) 
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a c 217 U Graphics card
a c 129 C Monitor
May 27, 2011 7:01:52 PM

Mousemonkey said:
There is a trick you can do with a resistor but I'm not that well versed up on it, however if you google for the 'fix' that allows ATi cards to be used as a primary card for PhysX you may find it.


I believe you are referring to this guide: http://www.overclock.net/graphics-cards-general/633137-...

I've done it before. It cost me $1 for the resisters at Radio shack.
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a b U Graphics card
a b C Monitor
May 27, 2011 9:19:24 PM

chances are your getting a driver conflict due to having 2 cards plugged in and working. normally you will either have 2 cards of the same spec or an additional card in that can handle physics . you have neither so your driver is likely to see an unrecognized/unsupported config and decides to crash.

chances are its a hardware conflict...
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