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Author Topic: Quad 5870 ... will this work?  (Read 1420 times)
mrenouf
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June 01, 2011, 01:29:03 AM
 #1

After literally days digging around for a 5970 or a 6990 for less than an arm or leg, on impulse I snatched up 4 5870's ...  I figure this should land me easily somewhere north of 1500MHash/s, hopefully more like 1600. Which is more than a pair of 6990's or 5970's would do, and costs about the same. The price I pay, I presume will be in power efficiency. They are rated at 200W max draw (according to AMD). I do not plan to O/C.

Details:

4x 5870
MSI 890FXA-GD70
No case, custom cooling/fans

Questions:

PSU: 1000W ? Or 1200W for better efficiency (running around 70% of rated load)?

Is a single core CPU (3Ghz) enough to keep 4 GPUs busy? This will be a dedicated system.
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gnukix
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June 01, 2011, 01:54:46 AM
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GPU mining (should) barely use any CPU at all.  Latest startup on my windows poclbm-mod miner has poclbm using about 8 CPU minutes over about 9 hours.  Compare that to task manager using 15 minutes in 3 hours, and IDK how much in chrome/etc.  It barely even uses 1% of the CPU, the bitcoin/bitcoind probably uses more CPU to handle block processing.

As for if a 1kW PSU will be enough, and how efficient it will be, depends ENTIRELY on the PSU.  Remember most of the load is going onto the +12V rails in that scenario, and so the PSU has to be appropriately sized.  I've a 700W PSU that has PCIe connectors but can not have more than about 375W across both +12V rails on the PCI-express connectors (200W on one, 175W on the other rail) so it would maybe run 2 5870s.  I've another (newer) 400W PSU that can actually do almost as well (18A on either +12V rail, but a combined total of 350W).  So really, you have to see the plate on the PSU to be able to have any hope of telling.  That said, most of you're big 1kW+ PSUs are designed pretty good and heavy on +12V these days (unlike my 700W example)


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mrenouf
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June 01, 2011, 02:17:33 AM
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Sweet. There is something very refreshing about spending $30 on a CPU for a system with well over $1,000 in GPUs in it  Grin
pokermon919
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June 01, 2011, 05:00:04 AM
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if you don't plan to overclock don't expect 1500-1600
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June 01, 2011, 06:35:38 AM
 #5

a single core CPU like sempron is enough and efficient! but you should have at least 1GB of RAM since the miners are ram hungry.
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