Widescreen Gaming Forum

Hey Gents,

First post here. Seems like a very nice place with lots of useful info :).
Apologies if this is covered in another thread. I searched with no luck.

I currently have a 5870 1GB, thinking about purchasing another card probably a 5870 6 2GB to run a crossfire config and bring my VRAM up to 3GB total.
I've got three (3) U2410s and I might add a forth monitor plus I would like to play BC2 at 5760X1200 maxed out :mrgreen: Will a 5870 1GB and a 5870 6 2GB run in crossfire?

I'm also interested in running a mixed mode config using Eyefinity (assuming I pick up the forth monitor). I would like to run a 3X1 Display Group plus a single extended display. Link below from amd.com. I think the only way you can run more than 3 monitors in crossfire is with the 5870 6 2G. Is that true and has anyone tried any of these mixed mode configurations?
http://support.amd.com/us/kbarticles/Pages/gpu50-ati-eyefinity-display-configs.aspx

Thanks for looking :).
b

Hey there,

I believe combining those cards WON'T give you 3Gb of VRAM. You will only get the LOWEST amount of VRAM of either GPU. ie 1Gb.

An Eyefinity 6 edition would be a waste IMO. To run 4 monitors simultaneously, you would need the Eyefinity 6 edition. To run this setup on a NON Eyefinity 6 edition, you have to turn crossfire OFF (which defeats the purpose of what you are proposing).

Also, you MAY get issues running crossfire + Eyefinity. ie poor/low frame rates.

Remember, at that res, you may not be able to MAX out your settings. You will probably have to turn down/off settings (AA/AF/Post processing etc) to get playable frames.

In my experience, I have NEVER been able to "MAX out" game settings in Eyefinity.

IMO, sell your 5870 1Gb and use a single 5870 Eyefinity 6 edition.

Hope this helps.

Yeah, GPUs in SLI and Crossfire don't share RAM as far as I know. Basically, one GPU renders one frame, then the other renders the next frame and so on... and each GPU requires it's own memory to do it. I know if you can run Crossfire between a 1GB card and a 2GB one, but if you can it would basically be like having 1GB per GPU, the extra GB on the second card would not be used.

In my experience, I have NEVER been able to "MAX out" game settings in Eyefinity.

You're running 3 30 inch displays? Given the benchmarks results I've seen for 5760X1200 I'm guessing your frame rates at native resolution aren't exactly great.

Might consider swapping 1GB for 2GB E6.
See how that runs and if I get really greedy I might throw in another E6 :)
It's actually 3X 24inch Dells. 1920X1200 each. I think a fair number of people have been running that setup.
I play BC2 which doesn't appear to be a game that is used in many of the BM's on WSGF.
Thanks for the replies gents.