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650W great enough for two 4850's? and two 4850's on AMD board?

Last response: in Graphics & Displays
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December 28, 2008 7:26:21 AM

i was reading around and heard i couldnt run crossfire with two 4850's on an AMD board. is this true?
and would 650W be enough for two 4850's?

its a Corsair 650W
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

4850: (two)
SAPPHIRE 100245L Radeon HD 4850 512MB 256-bit GDDR3
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

thanks in advance.
December 28, 2008 7:40:57 AM

The power supply is sufficient, and of course AMD graphics cards can be crossfired on an AMD board, but only the AMD boards that have two PCI-Express slots and a chipset that supports it.

Post your motherboard and we can tell you, or look it up at the manufacturer site.
December 28, 2008 9:30:34 PM

JuiceJones said:
The power supply is sufficient, and of course AMD graphics cards can be crossfired on an AMD board, but only the AMD boards that have two PCI-Express slots and a chipset that supports it.

Post your motherboard and we can tell you, or look it up at the manufacturer site.



oh thanks. i forgot to post my motherboard here it is:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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December 29, 2008 12:26:45 AM

aj95 said:
i was reading around and heard i couldnt run crossfire with two 4850's on an AMD board. is this true?
and would 650W be enough for two 4850's?

its a Corsair 650W
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

4850: (two)
SAPPHIRE 100245L Radeon HD 4850 512MB 256-bit GDDR3
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

thanks in advance.


From ATI Radeon's Site:

Quote:

ATI Radeon™ HD 4850 System Requirements

* PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard
* 450 Watt or greater power supply with 75 Watt 6-pin PCI Express® power connector recommended (550 Watt and two 6-pin connectors for ATI CrossFireX™ technology in dual mode)
* Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSU for a list of Certified products
* Minimum 1GB of system memory
* Installation software requires CD-ROM drive
* DVD playback requires DVD drive
* Blu-ray™ playback requires Blu-ray drive
* For a complete ATI CrossFireX™ system, a second ATI Radeon™ HD 4850 graphics card, an ATI CrossFireX Ready motherboard and one ATI CrossFireX Bridge Interconnect cable per graphics card (included) are required


January 7, 2009 3:51:38 PM

"Only runs in x8 mode, but shouldn't matter much if at all"

With x2 3870's on a SB600 board that had 2x8 I gained 25% 3dmark and about 30% in game fps going to a board with 2x16. With something like 4850's I'm guessing there is going to be a good deal of bottle necked performance that you'll be missing... If you haven't bought your cards already might want to look at the 4850x2
January 7, 2009 9:09:51 PM

Is that PCI-Express 1.1 or 2.0?

I would find that very believable if it were 1.1, but PCI-E 2.0 at x8 is the full bandwidth of x16 PCI-E 1.1, and Tom's review shows little difference between P45 (8x8) and X48 (16x16) crossfire.
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