crossfire

sbrehm72255 · Posted: Wed, 29 Apr 2009 14:10:23 Post Subject:

That's a given that some games are optimized for one type of card or multi GPU or another, you always have to look at what type of games and software you plan on using before you jump in and pay a ton of money for a new video setup, doesn't matter if its ATi X-Fire or Nvidia SLi.............. Wink

If you read my statement above correctly I was simply referring to a mixed X-Fire setup on the same system, which has nothing to do with single card setups or anything else.............. Grin

burnin8r · Rated R Joined: 15 Apr 2009 Posts: 54

I think the one specific comparison you are referring to is more of an exception than the rule............... Mr. T

back on topic, I do recall some a few mATX boards that had one 16x slot and one 4x that were capable of crossfire using a hacked BIOS:

Asus P5B-VM / P5k-VM
Gigabyte G33M-S2H

so technically two 16x slots aren t a necessity but crossfire on an x1 PCI-e would not work.

**Doctor Feelgood** · Posted: Wed, 29 Apr 2009 15:45:54 Post Subject:

Was it x4 electrically or physically? I would guess electrically, but with an x16 slot. What CrossFire capable card could you fit into a x4 PCIe slot?

burnin8r · Rated R Joined: 15 Apr 2009 Posts: 54

the x4 slots were at the edge of the board, so a single slot card like the HD 3850 was the best you could use. I am still looking for pics but the slots were physically x4, not electrically limited if I'm not mistaken.

SUSHRUKH · Rated NC-17 Joined: 28 Jan 2007 Posts: 137

You will need 2 x PCIE 16x slots for Xfire.

zachig · Rated XXX Joined: 22 Mar 2005 Posts: 313

I think the main question of this thread has already been answered, but I was wondering...

Since not all motherboards with 2 PCI-E slots, really offer x16.

I have the Gigabyte GA-EP45-UD3P, which has 2 PCI-E slots, which supports CrossFireX, but from what I understood, each PCI-E slot individually can run at x16 speed, but when 2 video cards are crossfired, than they'll work (in my case) in x8 speed. It that true? (I guess the answer is YES).

If so, anyone knows what is the performance drop of using two high-end ATI Video Cards in CrossFireX x8 compared to running the same 2 cards in full x16 speed? Rolling Eyes

burnin8r · Rated R Joined: 15 Apr 2009 Posts: 54

I don t believe any card uses the full x16, someone correct me if I am quoting out of date info.

zachig · Rated XXX Joined: 22 Mar 2005 Posts: 313