Sign in with
Sign up | Sign in
Your question

4870x2 Crossfire

Last response: in Graphics & Displays
Share
July 16, 2008 9:47:12 PM

Quicky question.... From my reading here....it seems the 4870x2 coming out can be Crossfired (like the slightly older 4870) with another 4870x2 thus giving you a "Quad" GPU set up.......or am I mistaken that the Crossfire software will not support 4 GPU's?

More about : 4870x2 crossfire

July 16, 2008 9:55:35 PM

Yes, it can support (4) in that fashion. AMD/ATI has tested up to 8 (4x 4870x2's), but do not officially support that many.
Anonymous
a b U Graphics card
July 16, 2008 9:59:00 PM

it will work... although from the previews... the rumor that the OS/Driver would see the card as one... appears false... so the scaling probably won't be too good
Related resources
Can't find your answer ? Ask !
July 16, 2008 10:30:16 PM

How big a psu would that require? I'm thinking of taking the plunge with that quad cf. :p 
July 16, 2008 10:49:59 PM

if you have more money than sense dagger, go ahead and show me the results afterwards, but i suspect you would need substantially upwards of 1000 watts....
July 16, 2008 10:52:45 PM

Agreed. I believe that total system draw with one 4870X2 and a Core2 Extreme was upwards of 500W with "an Intel QX9770, 2GB Corsair RAM, 3 WD Raptor Hard Drives, a DVD/CDRom, a floppy drive, and a Koolance Exos water cooling system."

Linkage: http://enthusiast.hardocp.com/article.html?art=MTUzMSw5...
July 17, 2008 12:19:31 AM

Quote:
it will work... although from the previews... the rumor that the OS/Driver would see the card as one... appears false... so the scaling probably won't be too good


The way i read it was that the driver os would see the x2 as 1 gpu and not 2 gpus, not multiple cards as one card.

July 17, 2008 12:28:28 AM

royalcrown said:
The way i read it was that the driver os would see the x2 as 1 gpu and not 2 gpus, not multiple cards as one card.

Unforunately it didn't scale as a single gpu, which is what matters. :p 
July 17, 2008 12:33:09 AM

well, they never will, due to the laws of physics and engineering problems as well as rendering "granularity". I'd be psyched if they could avg 90 percent.
a b U Graphics card
July 21, 2008 3:53:28 AM

I have the feeling that just like 2x 9800GX2's, 2x 4870X2's won't give that much a preformance boost. Could be wrong though...
July 21, 2008 4:39:45 AM

If hardocp's article on the 4870x2 quadfire is any indication, there is a markable AA performance increase.
a b U Graphics card
July 21, 2008 4:43:22 AM

Yeah that was actually quite interesting.

Still needs more tests to see the orverall picture, but some of them are pretty good sofar regarding the AA hit.

However those that have CF issues, still have CF issues with the QuadFire.
August 13, 2008 10:47:43 AM
a b U Graphics card
August 13, 2008 1:37:39 PM

Nytmare said:
Quicky question.... From my reading here....it seems the 4870x2 coming out can be Crossfired (like the slightly older 4870) with another 4870x2 thus giving you a "Quad" GPU set up.......or am I mistaken that the Crossfire software will not support 4 GPU's?




Be advised that such a setup would basically force you to use a 64 bit OS, since you WILL run smack into the 4GB address space limitation inherent in any 32 bit OS:

4870X2 (1GB of memory mapped I/O) times two = 2GB of address space consumed
500~750MB worth of address space required for the Bios, communications and system devices

You are now at 2.5~2.75GB of address space, and only have 1.5GB left for RAM. And it's been a year or three since 1GB was considered excellent for gaming purposes...


The theoretical limit for 64 bit OSs is something like 16 Exabytes (thousands of Gigabytes), but current 64 bit Windows OSs are capped at something like 160GB. Still... More than enough to handle a full rack of RAM and a CrossfireX/SLIx3 setup.

January 27, 2009 3:42:58 PM

*If* in the future I wish to add a second 4870x2 card, would it have to be the same manufacturer or could I mix and match?

Also, I have a P5E3 Premium motherboard, and the top slot's positioning would make the card impossible to install without touching the memory modules. Is there any way round this?
!