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6850 Crossfire PSU Question, upgrading soon

Last response: in Graphics & Displays
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January 4, 2011 6:57:08 PM

Hello All! I'm getting ready to upgrade from my 9800 GT to either a single 6850 or a 460.
My system:
Mobo: Asus Intel P55 (SLi and Crossfire compatible)
CPU: Intel Core i7 870 @ 2.9 Ghz
RAM: 4GB ddr3
Current VGA: 9800 GT
Current display: 19" 1440x900 (may upgrade to a 21" 1600x900 or similar soon)
PSU: 630 Watt w/ two PCI-E 6-pins (newegg link)

I'm leaning more toward the 6850, because it only requires one 6-pin from the PSU. That should allow me (from what I've read) to run a second 6850 in crossfire without upgrading my PSU. I don't plan to buy until later this month after the gtx 560 comes out, as that may shake up prices a bit,

Twofold question: 1) Would my PSU support two 6850's in crossfire? I wouldn't get the 2nd card for a few months, at least. From the research I've done, I thing two 6850's in crossfire will nicely round out my system, but they may be a bit of a strain on the power supply.

2) Would it be better to buy a more power-hungry card now (ie gtx 460 or something that requires two 6-pin connectors) and need to spend ~$95 more to upgrade the PSU later? From what I've read the 6850 and 460 are about in par with each other, and both scale very well.

Thanks in advance!

Edit to fix link
a b U Graphics card
January 4, 2011 7:09:56 PM

A decent 630w power supply should power CF-HD6850 so-long as you don't plan on overclocking anything.
a b U Graphics card
January 4, 2011 7:16:05 PM

First off, Your Newegg link returns a "item discontinued" message on a page with a lot of Rosewill power supplies, so we don't know what you were trying to link to.

So the answer to question no.1 is unknown at this point, except I personally wouldn't run two 6850's on less than a 650 watt PSU and would prefer a 750 watt unit from Corsair, Seasonic, or Antec.

Question 2: Since I don't know exactly what your current PSU is, I have no opinion on whether or not it will support either a 6850 or "more power-hungry" card.
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a c 125 U Graphics card
January 4, 2011 8:08:45 PM
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Raidmax isn't a very reputable brand name, and it has split 12V so it might be delivering enough amps for a CPU on one rail and not enough to the GPUs on the other rail. Not sure what sort of amperage 6850s will use.

I'd say it'll work fine, but for how long I don't know. Might be worth upgrading to a corsair or antec 650-750W PSU.
a b U Graphics card
January 4, 2011 9:38:37 PM

wolfram23 said:
Raidmax isn't a very reputable brand name, and it has split 12V so it might be delivering enough amps for a CPU on one rail and not enough to the GPUs on the other rail. Not sure what sort of amperage 6850s will use.

I'd say it'll work fine, but for how long I don't know. Might be worth upgrading to a corsair or antec 650-750W PSU.


+1! My thoughts exactly! ;) 
January 4, 2011 9:54:33 PM

At either of the resolutions you've posted a single 6850 would run everything smoothly.

Also the jump from 19" to 21" (still 'low' resolution) would not be worth the coin, save up slightly more for a 1920x1080 23 or 24" where crossfire 6850 benefits would actually be seen.

January 4, 2011 9:55:38 PM

(Oh and I wouldn't be trusting that PSU for crossfire 6850s)
January 4, 2011 10:20:22 PM

I agree with Nerdbox, those resolutions are low, and a single 6850 would be more than enough. Going from 1440x900 to 1600x900 isn't a good idea, get a 1080p monitor at least.

And as far as a psu for 2 6850s, get a quality 650w PSU from Corsair, XFX, Seasonic, or Antec.
January 4, 2011 10:46:44 PM

Thank you all for your quick responses!

Quote:
Raidmax isn't a very reputable brand name, and it has split 12V so it might be delivering enough amps for a CPU on one rail and not enough to the GPUs on the other rail. Not sure what sort of amperage 6850s will use.

I'd say it'll work fine, but for how long I don't know. Might be worth upgrading to a corsair or antec 650-750W PSU.


That was what I was wondering. I've already had this PSU for 2 years. My fear was that by the time I go for crossfire it would be old AND pushed to its max at the same time. Not a good idea. I will look into getting a PSU from a better company when the time comes.

Do you think it can handle a single 460? Newegg has one on sale tonight here that I'm considering jumping on. I'll upgrade my power supply later next year for SLi if it comes to that. Oh, and Nerdbox87, I'll keep an eye out for a proper high resolution monitor before I go for SLi. ;) 
January 4, 2011 11:13:35 PM

Best answer selected by Yrahcaz91.
!