Best Current Mining Cards for multi-GPU rig?

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nster:
I'd just use a test bench

teknohog:
Quote from: [Tycho] on March 29, 2011, 04:54:47 AM

You would have to use flexible PCIe-extenders to connect four GPUs because if you plug them all directly into MB, they'll block ait intakes of each other.

And you can't plug them all directly because standart ATX system would accept only 7 cards (and each 5870 takes double space).


For 4 cards you would need 3 spaces in between, so a total of 7 slots would suffice. Of course, for cooling you need extenders. 1x extenders are probably better for airflow and extra flexibility, and the 1x speed is not a concern for mining.

orcy:
There are motherboards that can support 4 cards. For example, Gigabyte has motherboard GA-890FXA-UD7 with extended form factor that supports four double spaced cards: http://www.tomshardware.com/reviews/amd-890fx-crosshair-iv-formula-890fxa-ud7,2640-6.html.

However it is required to have the special case for such motherboard (XL-ATX).

kelp:
Quote from: orcy on March 29, 2011, 06:49:35 PM

There are motherboards that can support 4 cards. For example, Gigabyte has motherboard GA-890FXA-UD7 with extended form factor that supports four double spaced cards: http://www.tomshardware.com/reviews/amd-890fx-crosshair-iv-formula-890fxa-ud7,2640-6.html.

However it is required to have the special case for such motherboard (XL-ATX).


Yeah, I was looking at the MSI 890FXA-GD70 and the CoolerMaster HAF-X. That combo should fit 4 cards. But Motherboard + Case is $365.

A cheap case + cheap motherboard could save $~250.

If I could get 2 5970s for under $600 each, then I'd come out ahead on the dual 5970 system with a cheaper motherboard and case.

Otherwise, assuming I could cool it, it still seems like the 4x 5870 system makes sense.

And yeah, I understand I could save more by building super cheap cases out of various other things, but I don't think I want to make that optimization.

Jered Kenna (TradeHill):
What PSU are you talking about for 150usd that will power 4x5970 safely?

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