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Crossfiring a 4870 with a 4870x2?

Last response: in Graphics & Displays
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July 1, 2008 6:45:53 PM

The thread name says it all. Would it work? Do you think it will scale well? I'm building a new rig right now and am thinking of going with just the single 4870, and maybe adding in the 4870x2 later.
July 1, 2008 6:56:01 PM

It would work and it SHOULD scale well considering how well the 4850 and 4870 scale in CrossFire. However, a 4870 and a 4870 X2 will essentially be TRI-CrossFire so it's all up to the drivers and we probably won't know for sure until the 4870 X2 is released and somebody can bench it CrossFire'd with a 4870.
July 1, 2008 7:06:58 PM

Yea, no problem. It has been done with the 38xx series
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July 1, 2008 9:05:22 PM

The new connection bridge in r700 (4870x2) can change things, but they should work.
July 1, 2008 10:09:10 PM

What kind of power requirement would it be?
July 1, 2008 10:31:38 PM

A good 750watt powersupply would do.
July 1, 2008 10:34:39 PM

babybudha said:
A good 750watt powersupply would do.

I thought that's for 2 4870. Add a third core and still 750w? :p 
July 2, 2008 12:12:37 AM

AnalLeakage said:
The thread name says it all. Would it work? Do you think it will scale well? I'm building a new rig right now and am thinking of going with just the single 4870, and maybe adding in the 4870x2 later.

Actually nobody here can answer that question for sure unless they have some insider information on the nature of the 4870X2's new interconnect. I suspect that it will work, but it probably won't be ideal.

I also suspect a single 4870X2 will be so blindingly fast that there will be no need for another 4870.
July 2, 2008 10:21:57 AM

homerdog said:
Actually nobody here can answer that question for sure unless they have some insider information on the nature of the 4870X2's new interconnect. I suspect that it will work, but it probably won't be ideal.

I also suspect a single 4870X2 will be so blindingly fast that there will be no need for another 4870.


Yep, it's hard to know how much that CrossFire Sideport will affect. Maybe it's like three normal 4870's together, without using that bridge in those situations? In anyway if 4870x2 is "blindingly fast" it does not mean that very soon we will not need more speed... :-)
There are allways situations when more speed is better... How about crysis with AA on at very high settings... maybe we have to wait next generation for that... or special four core version of the 4870x4 ;-)

Easy solution, external craphic card with four cores glued together with those new CrossFire Sideport's... well maybe not so easy solution after all... It's better to wait ATI 5000 series and Nvidia 300 series for real Crysis support... They really put hardware down to their knees with their engine this time.

July 2, 2008 11:32:09 AM

Even two-way AFR rendering has issues with frame synchronization and input lag, and three-way (:) ) will only exacerbate these issues. I don't really recommend two cards, but never three.
July 2, 2008 3:30:44 PM

dagger said:
I thought that's for 2 4870. Add a third core and still 750w? :p 

If a PC Power and Cooling 750 silencer is enough for the below rig, it will be enough three 4870 cores.

http://www.maximumpc.com/article/dream_machine_2007

As i said, a "good" quality PS. Having 60amps on a single 12v rail really helps! Multiple rails are just not as efficient.
July 2, 2008 9:00:47 PM

You think at a DFI x38 can handle 2 4870 in CF?
July 6, 2008 9:10:10 PM

x38 chips use 2 x16 pci slots so crossfire will be fine.
July 6, 2008 9:51:18 PM

Xyiitol said:
You think at a DFI x38 can handle 2 4870 in CF?

Yes
July 7, 2008 5:47:43 AM

Yes, it would be work which is same as 3870 crossfire X with 3870X2 done before. I still not really happy for the high resolution performance of 4870 crossfire, Crysis with High quality at 1920X1200 with 8xAA is still OK but unfortunately I play GRID at 1920X1200 with 8xAA and 16xAF enabled and found sometimes a bit flickering. I will go with 4870 crossfire X with 4870X2 once it is available in market. I already updated my PSU to Silverstone 1200Watt 10 days before. I guess 750 to 800 Watt would be basic requirement. Good Luck guy and enjoy your gaming. :D 
July 7, 2008 6:24:59 AM

Analeakage???

Some name...
July 7, 2008 8:10:21 AM

Anyone doubt my Zalman 850 Watt continuous could handle Tri-Sli w/ 4870 and 4870X2 ? I need some opinions.
July 7, 2008 2:12:12 PM

Annisman said:
Anyone doubt my Zalman 850 Watt continuous could handle Tri-Sli w/ 4870 and 4870X2 ? I need some opinions.

I think you'll be alright with that PSU.
July 8, 2008 6:50:48 PM

Ok, thanks
!