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Advice on my PSU with CF 6850s

post #1 of 10
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I already have a Radeon 6850, and I'm considering making it into a crossfire setup, as I'm getting some upgrades. I have the Cooler Master RS-550-PCAR-E3, and I'm going to be having a i7 2600K (which I will probably OC to around 4.4-4.5Ghz) along with 4 SATA HDDs (regular 3GBit/s sata) and the Radeon 6850 I currently have. Can I saftely chuck another 6850 into my rig with 550W, or will I need to upgrade to 600-650?
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Katipo
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post #2 of 10
Im not sure how good that particular PSU is, but any quality 500w PSU could handle 6850s.

EDIT:
6850s if I remember correctly draw around 200w, and around 250w on furmark, that's leaves plenty of room for your other components.
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post #3 of 10
That psu is of half-decent quality and it won't be able to power your 2x6850s and an oc'ed 2600k.

Quote:
Originally Posted by munaim1 View Post
Im not sure how good that particular PSU is, but any quality 500w PSU could handle 6850s.

EDIT:
6850s if I remember correctly draw around 200w, and around 250w on furmark, that's leaves plenty of room for your other components.
1 6850 uses 127w and more on furmark. so we're looking at 300w for 2 6850s + 120w for 2600k. The rest is 50w but then again your psu isn't very good so I don't think it will handle the load reliably.

A 600w+ unit will suffice thou.
Edited by robwadeson - 7/20/11 at 8:54pm
    
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post #4 of 10
You'll need a new PSU for Crossfire 6850s. Your psu won't cut it.

This one would do the job fine and also has 4 pci-e connectors too.

http://www.newegg.com/Product/Produc...82E16817207014
    
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post #5 of 10
It's a relabeled 500W unit with overall bad performance, poor efficiency, and poor internals, that burns up if you try to pull 550W:
http://www.hardwaresecrets.com/artic...y-Review/969/9

With an overclock on everything, it should be possible to break 500W power consumption in the worst case scenario. If at all possible, consider replacing the power supply since it sucks, but it should be able to handle the load in general usage...until the Su'scon capacitors give out (okay, they're definitely not the worst, but going into 3rd tier).

In the range of 500W should be fine, but if you want something new, I'd just get the Earthwatts Green 650W since it's only $60 shipped (no rebate):
http://www.newegg.com/Product/Produc...82E16817371044
Edited by mikeaj - 7/20/11 at 9:07pm
post #6 of 10
Get something in the 650watts range. Corsair TX650 perhaps.
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post #7 of 10
Thread Starter 
Thanks for all the advice! I had a suspicion that it couldn't handle two 6850s.

The Earthwatts Green 650W looks pretty good, I don't want to spend too much on the PSU if I don't have to.

Is there anything in particular I should be looking out for in this new PSU that tricky marketers might try to hide from me?
Katipo
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i7 2600K @ 4.4Ghz Gigabyte GA-Z68X-UD4-B3 Radeon HD 6850, overclocked to 930Mhz when gaming Corsair Vengeance 2x4GB 
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WD drives (1x250GB, 3x1.5TB) Win 7 64 bit LG Flatron W2353V Cooler Master RS-550-PCAR-E3 
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Katipo
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i7 2600K @ 4.4Ghz Gigabyte GA-Z68X-UD4-B3 Radeon HD 6850, overclocked to 930Mhz when gaming Corsair Vengeance 2x4GB 
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WD drives (1x250GB, 3x1.5TB) Win 7 64 bit LG Flatron W2353V Cooler Master RS-550-PCAR-E3 
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post #8 of 10
go turds to the wall man http://www.newegg.com/Product/Produc...82E16817139034

i like the new corsair 1050. But its a tad spendy yet you won't be swapping it out ever again .
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post #9 of 10
Quote:
Originally Posted by Chiefpuff420 View Post
go turds to the wall man http://www.newegg.com/Product/Produc...82E16817139034

i like the new corsair 1050. But its a tad spendy yet you won't be swapping it out ever again .
really? overkill much? OP doesn't need 1kw+, his system will actually run fine on a quality 550w PSU, but his going for the 650w which is still good.
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Intel X25-M G2 80GB 3x Samsung F3 500GB RAID 0 EK Supreme HF Full Copper Windows 7 Ultimate 64bit 
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it looks alive
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Sandy Transformed
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CPUMotherboardGraphicsRAM
i5 2500K [5ghz 1.44v 24/7] Asus Maximus IV Extreme SLI GTX 460 @ 920/1840/4100 [1.11v] 4GB Dominator GT @ 2133mhz CL8 [1.65v] 
Hard DriveHard DriveCoolingOS
Intel X25-M G2 80GB 3x Samsung F3 500GB RAID 0 EK Supreme HF Full Copper Windows 7 Ultimate 64bit 
MonitorPowerCaseAudio
LG42SL9500 42" 1080p [Surround Soon] XFX XXX Edition 650w Xigmatec Elysium JVC HA-RX700 [foam mod] 
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post #10 of 10
Quote:
Originally Posted by Chiefpuff420 View Post
go turds to the wall man http://www.newegg.com/Product/Produc...82E16817139034

i like the new corsair 1050. But its a tad spendy yet you won't be swapping it out ever again .
until it breaks
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