1 and 2 GB crossfire?

shadow32 · Nov 24, 2013

I have an HD 7850 1gb :http://www.newegg.com/Product/Product.aspx?Item=N82E16814202004

Can I get a 2GB card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814127663

Can I use the 2 card with my mobo (specs in sig *yes I know they will fit) if I run at same clock and memory speed?

The question is, will the combined Vram be 3gb? Or will it be limited to 2gb?

cst1992 · Nov 24, 2013

You need same ram capacity as the same data will be copied to both the cards.
Many people think that sli and crossfire double the capacity but that is not true.
One review I read, it said SLIing 2 titans will make RAM 12GB, but that is wrong, the RAM will still be 6 GB. Just the performance is THEORETICALLY doubled.

shadow32 · Nov 24, 2013

cst1992 :

Performance is hardly, if not, never "doubled" when SLI/Crossfiring 2 cards. Its even less when you get 3 cards, and not even worth it with 4 (+5% performance)

cst1992 · Nov 24, 2013

I know that, but it should theoretically double, that is why a 690 is 2x as fast as a 680, cause internally it is 680 x2.
Get same capacity, brand may be different, but model has to be same.

shadow32 · Nov 24, 2013

Wait, were you saying that if you crossfire 2x 2GB cards, the Vram used will still only be 2GB?

If so, does that mean 2x 1GB HD 7850 will have exact same performance as 2x 2GB HD 7850?

cst1992 · Nov 24, 2013

Yes, only 2 gb of ram is used, as 2 gb is available.(do not count the memories on the cards as separate).
If you're gaming at a resolution less than 1080p, yes.
If you do crossfire 1 and 2 gb variants, then the 2 gb card will only use 1 gb of ram as the other card is using 1 gb, so the extra gigabyte is wasted.
And since the prices aren't exactly the same, you'd rather get the 1gb version.

shadow32 · Nov 24, 2013

cst1992 :

But will 2x 2gb cards only use 2GB?

Would It be better to get the 2GB card as the primary and the 1gb as secondary, or just both 1GB?

cst1992 · Nov 24, 2013

get both 1gb, it will save you money.

I will say again: 2 GB has NO benefit whatsoever in this if you use 1 gb and 2 gb crossfire.

shadow32 · Nov 24, 2013

cst1992 :

Im wondering though, if using 2x 2GB cards, will you only have 2GB?

cst1992 · Nov 24, 2013

shadow32 · Nov 24, 2013

cst1992 :

Alright, thanks. Learn something new everyday.

cst1992 · Nov 24, 2013

You're welcome.

Think of it as this.
Take two 9v batteries.
Connect them in parallel(+ to +, - to -)
then connect a multimeter or bulb.
The voltage remains same, but the bulb glows twice as brightly.
That means that the current is double now.
Same thing here. Twice the processing power, and same RAM.
That makes sense as well, as graphics cards compute in real time.

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1 and 2 GB crossfire?

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