Trifire 4870 & 4 monitors

[microterf]

Does anyone have any experience with Trifiring 4870s (4870x2 crossfired with another 4870) I currently have a 4870x2 and a 4850. I am debating on getting a 4870 to Xfire, I am running 4 monitors also. My questions are:

1. Will I see much performance with the 3rd GPU

2. Will I be able to just turn crossfire on and it will disable the other 2 monitors (on the secondary card) or will I have to mess around with manually disabling those to use Xfire?

 

[padlius]

You cant do that, you have to have 4870X2 I think, Im not an expert here, but even I can tell that the cards must be the same. So I think that trifire isnt real. But im not an expert here so I cant tell.

 

[cjl]

You cant do that, you have to have 4870X2 I think, Im not an expert here, but even I can tell that the cards must be the same. So I think that trifire isnt real. But im not an expert here so I cant tell.

Oh, trifire is absolutely real. In fact, any combination of 4850s and 4870s can be crossfired as long as the total number of GPUs doesn't exceed 4 (with the possible exception of the non-reference 4850x2 design).

As for performance, it'll behave exactly as your current setup does, but with more performance (I'm assuming your 4850 is xfired with the 4870x2). How much more will depend on the game though. Do you have any current performance problems?

 

[padlius]

Ohh, ok I didnt knew that you can crossfire the same X2 with the another one. By the way go to this post and help me solve my prob please http://www.tomshardware.co.uk/forum/page-262581_15_0.html#t1924725.

 

[Tech-Boy]

We appreciate your comments padlius, and I do not mean to sound rude or mean. Put please let us try to help the author of this post and not contaminate his post. Thanks!

Microterf here is a link that may help you in your decision! http://www.rage3d.com/board/showthread.php?t=33929979

Good Luck!

 

[Annisman]

Thought someone would never ask.... I added a 4870 1GB to my rig recently, for effective tri-fire. On the whole it is a pretty solid performing setup.

http://www.tomshardware.com/forum/260564-33-4870x2-4870-fire-benchmarks

That's the link to the benchmarks that I ran, have a look, and goodluck on the setup !



By the way, I recently added a Q9650 to my rig, which helped get rid of some of the CPU bottlenecks in that benchmark.

 

[microterf]

The 4850 isn't Xfired, it's just there for my extra 2 monitors. (I don't think you can use it with a 4870x2) on the compatibility site, It seems that any 4870 can Xfire with any other 4870 I.E. the 4870x2 with 4870x2 or 4870 etc...

The other question is does anyone know if I will be able to use my 4 monitors with the Crossfire bridge on. I.E. Will I be able to go into the Xfirex tab and just disable it and then use the other two monitors. Because that's not a problem if I can. It is a problem if I have to physically take the crossfire bridge off to be able to use the extra DVI ports.

P.S. 3rd question. I have a true 850W PSU, that should push these, right??

 

[microterf]

annisman, Could you share your improvements since going quad core. I'm currently runnin a Phenom II 940@3.2. 8GB DDR @800