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bbminer (OP)
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June 04, 2011, 08:50:48 AM
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Is it possible to run a 3 card 6990 bitcoin mining system under Windows? I am seeing a lot of guides for linux. I would prefer Windows if it's possible.

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June 04, 2011, 09:01:59 AM
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Nope..I'm afraid not. 3 6990s = 6 total GPU cores. Windows can address only 4 max.

Maybe it might be more efficient and cheaper to run 2 separate rigs with 2 x 6990s?
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June 04, 2011, 09:11:54 AM
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Quote from: allinvain on June 04, 2011, 09:01:59 AM
Nope..I'm afraid not. 3 6990s = 6 total GPU cores. Windows can address only 4 max.

nope, this is totally wrong. i was folding with 3 gtx295 in the same rig, for a total of 6 GPUs in win7 and XP. you can do the same with HD6990. i think you're confusing it with SLI and crossfire. you can't SLI or crossfire more than 4 GPUs, but that would not apply for mining anyways
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June 04, 2011, 09:47:26 AM
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oooppss...yes my bad I was indeed confusing it with crossfire..

as a side note under linux you can see 6+ GPU cores..I've seen some 4 x 5970 rigs..
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June 04, 2011, 02:38:49 PM
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Windows can only support 4 ATI GPUs.  I am not sure what the limit is with Nvidia, but that's the reason why you were able to get Windows to recognize 4+ Nvidia GPUs
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June 04, 2011, 10:27:45 PM
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Aha! So I have been vindicated. Well I should've had more confidence in my own words.
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