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ATi 5850 & Rosewill RP550-2 550W ATX12V v2.01 Power Supply

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December 2, 2009 11:45:19 PM

Hello and greetings. I've built and rebuilt my computer a few times but I'm never really sure about PSU's hence I'm posting here. So here is my question. Can my Rosewill RP550-2 550W support a single 5850?

You can find my PSU here:

Thank you ahead of time. I know I'd be cutting it close but I'd like to know how safe I'd be if I got one.
a b U Graphics card
a b ) Power supply
December 3, 2009 3:17:23 AM

^ The PSU has good amount of amperage on the 12V rails...But not sure about the quality as that matter the most...And also you wont have the required power connectors to run the 5850...you would need a 6-pin power adaptor as the 5850 requires 2 6 pin PCIe power connectors but your PSU has only one...

And also would depend on the rest of your config...If you have an overclocked CPU and additional components apart from the standard ones, then again you might have trouble...
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a b U Graphics card
December 3, 2009 3:21:48 AM

These are the official requirements, but it will depend on the rest of your system.

ATI Radeon™ HD5850 System Requirements

PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard
• 500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in • dual mode)

ATI Radeon™ HD5870 System Requirements

• PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard
• 500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in • dual mode)
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a b U Graphics card
December 3, 2009 3:24:44 AM

On newegg, the amperage & rating are both good. It is enough for a 5850, however as gkay said, multiple HDDs & Drives can suck up a lot of power. A OC'd processor also can take up a lot, especially the Phenom X4 9550/9650 - in fact most of the 9X50 Phenoms (TLB Error Fixed) that are over 2GHz use quite a bit, mostly due to the 65nm process.
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a c 175 U Graphics card
a c 88 ) Power supply
December 3, 2009 9:01:43 AM

Rosewill PSUs tend to be junk, I'd argue that one is as well. 550W and only one PCIe plug? No CF/SLI? It has the ancient voltage select switch in the back as well. Efficiency isn't even 75%. And they want $45 for that? I would link you a better newer PSU but it sounds like you already own that one.

While the label claims it has 35A available, I doubt it can really do that. It has a large 300W 3.3 +5V ability, and older models like this can't really do full output on 12V. I suspect if you tried to use it to power a 58xx, it would work for awile but the unit will die. Its simply to much for an older unit.
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December 3, 2009 9:40:25 PM

Right now I have 1x HDD (250Gb), 1x ATi 4670, 1x SATA DVD Drive, 6x 120mm Fans, 2x 1Gb DDR2-800 Ram, and a AMD 7750 Kuma AM2 CPU.

I plan to add a 1T HDD and another two sticks of the same ram. Would this put me over?

I've had this PSU for three or so years and I'm kinda tight on money. I wanted to get the 5850 but I'd rather not upgrade my PSU as well. Its been a good PSU to me through several rebuilds.
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a c 175 U Graphics card
a c 88 ) Power supply
December 3, 2009 11:15:17 PM

Adding drives and other things isn't going to stress the PSU. Adding the 5850 will. It will want lots of 12V power, and that old designed PSU probably won't handle it well. It will work, but I question for how long.

Zip listed a pretty ok PSU. $40 after rebate isn't a bad price. And it will power that 5850 a lot better then your current PSU.
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March 25, 2010 7:21:44 PM

yo guys watsup?

i just have one question is HUNTKEY a good brand for a PSU? And do the huntkeys have at least 2 6pin power connectors. I'm proberbly going to buy a 700W PSU from HUNTKEY. Thanx.

Sorry for my bad english... :) 
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