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Crossfire in PCIE 3.0 x16/x4

Last response: in Graphics & Displays
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February 19, 2012 7:54:04 PM

It is well known that in PCIE 2.0 crossfiring x8/x8 is superior than x4/x16

Now Ivy bridge is not out yet so PCIE 3.0 is not supported..

The question is this...

Now I have a Radeon HD 5770 and a pentium g840 cpu on a 1155 z68 mainboard which has x16 and x4 PCIE Gen 3.0 slots..

When Ivy bridge comes I ll buy a new cpu which will enable PCIE 3.0

Do you think PCIE 3.0 x4/x16 would work better than in PCIE 2.0 x4/x16 crossfire if I get a second hd 5770 ?

Since PCIE 3.0 offers double bandwidth it could be perhaps considered like x8/x32 ? (x4*2/x16*2) ... ?

I found nothing about this.

More about : crossfire pcie x16

a c 84 U Graphics card
February 19, 2012 8:28:18 PM

aah but the problem is hd 5770 is a 2.1 card so it doesn't know how to use the 3.0 signaling, so no extra bandwidht for it. sorry
You would need a hd7000 series card for 3.0 crossfiring, both of them...
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February 19, 2012 9:18:47 PM

perhaps then I should go one good 7k series
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a c 84 U Graphics card
February 19, 2012 9:31:43 PM

That's probably the best choice, and by the time IvyBridge finally gets released, the 7k series might have come down in price a little bit. To get a meaningfull increase in performance you might want to check the soon to be released hd 7800 cards. Release in March?

Or if budget allows even 7900 series. or nvidia equivalents when they get released... so much choices... :p  Just make sure you have powerfull enough power supply to run it...
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February 19, 2012 10:54:41 PM

i doubt 500 W will be enough then
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a b U Graphics card
February 19, 2012 10:57:29 PM

500W will be plenty for the 78XX series. Hell, the 7950 only draws 200W...

Edit : assuming it's from a quality brand like Corsair, Seasonic or Antec...
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February 20, 2012 1:02:45 AM

This is why I love amd in gpu sector... they consume low energy.. and still efficient

the link you gave is hd 7770 though... I wouldnt buy a 7770.. which is 128 bit... too not much improvement over 5770.. i d get at least 7850
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a c 84 U Graphics card
February 20, 2012 8:47:04 AM

run-dll said:
the link you gave is hd 7770 though... I wouldnt buy a 7770.. which is 128 bit... too not much improvement over 5770.. i d get at least 7850
the chart still shows 7950 in there which was the point, I just linked to the latest review they've made.
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