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Can my PSU handle 5870 Crossfire

post #1 of 19
Thread Starter 
Adding another 5870 to my rig Finally, and I was wondering do I need to go ahead and order another PSU to power everything. I was thinking I would be okay, but I just wanted a little bit of insurance.
    
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post #2 of 19
Absolutely. AMD recommends a 600W power supply to power a system with two 5870s in it, so your PSU has more than enough capacity for adding a 2nd 5870.

http://www.amd.com/us/products/deskt...verview.aspx#3
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post #3 of 19
That BFG unit is a peak rated Huntkey AFAIK, so it's probably a 500-550w realistically. It would probably work, but I personally don't recommend it.
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post #4 of 19
Thread Starter 
Well I guess I think I may need to get a new PSU then. I think I may get a 750W/850W and call it a day then.

Ok guys next question should I buy a 750W or 850W for future proofing.
Edited by Dtrain - 4/20/11 at 11:08am
    
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post #5 of 19
Depends on what kind of upgrades you'll do in future. If you're not likely to SLI GTX 580's (or cards with a similar power consumption) then 850w would be a waste of money. A good 650-750w sounds fine for your needs.
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post #6 of 19
Unless you feel the need to buy 6990s and Xfire them, or go green for your next GPU purchase, then there's little need to go over 750w. Ever.

Note to self: Work out these pieces of wisdom BEFORE going out and buying an 850w PSU...
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post #7 of 19
The power supply requirements posted by AMD are regarding "peak" rated power supplies. So when they say that they recommend a 600W power supply to power a system that has two 5870s in it, they're referring to 600W "peak" rated units.

The BFGR650WGSPSU is a 650W "peak" rated unit that has a +12V rail capacity of 480W (40A) which is the same capacity as certain high-end 520W power supplies. However, it's still a 650W "peak" rated power supply, and so therefore it has enough power.

In my defense, I would never recommend this power supply to anyone. It's just that you already have it, and so I'll say this: it's enough power and you don't need a new PSU just to add a 2nd 5870, however you may want to consider replacing it with a higher quality unit for the love of your system. I don't mean to get a high quality 750W unit or anything: I'm just talking about getting a PSU that delivers cleaner and more stable power - especially for overclocking.
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It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #8 of 19
Thread Starter 
Well I had already been in search for a new PSU and I figured using my current PSU would be pushing it or wouldn't allow me to Overclock, so I was looking into one I didn't realize a 850W would literally be overkill. Does anyone have a PSU they could recommend me, as my GPU just came in today.
    
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post #9 of 19
Budget?
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post #10 of 19
Thread Starter 
I'd like to keep this under 100 or so.
    
CPUMotherboardGraphicsRAM
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