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Does Crossfire utilize memory from each GPU?

Last response: in Graphics & Displays
a b U Graphics card
May 7, 2011 1:52:50 AM

I've read no, and I've read yes. I have yet to receive confirmed info to back either case.
My situation is:
I'm a flight simmer into Rise of Flight. This is a very intensive GPU memory program. I have a single 1gb DDR5 5770 card. I'm looking to increase to 2gb GPU ram. Do I need to upgrade to a single 2gb card, or will an added 1gb 5770 in crossfire suffice?
a c 216 U Graphics card
May 7, 2011 6:00:28 AM

Crossfire works by alternating frames between the first card and then the 2nd card. Both cards use their own memory to render their frame. As a result, you effectively have only the amount of video ram as each individual card has.

What resolution do you play that flight simulator at? I find it hard to believe 1GB isn't enough. Of course I don't play flight simulators (or at least I haven't in nearly 10 years), so I might be out of the loop here.
a b U Graphics card
May 7, 2011 1:51:30 PM

I play at 1080p. The game has a GPU memory usage % in the start up screen. At maxed settings, my 1gb card is at 126%, which leads to some stuttering.
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May 30, 2011 7:05:03 AM

i dont think it only work with 1st card memory.
i still not understand why ppl say 1 gb always 1gb.. :ouch: 
so CrossfireX HD5770 will have 2X1GB

a b U Graphics card
a b } Memory
May 30, 2011 1:01:43 PM

GPU RAM won't be the important thing, I think. Processing power will make more difference if, as bystander says, the frames are alternated.