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Crossfiring my graphics

Last response: in Graphics & Displays
March 4, 2012 7:29:29 PM

Ok folks, i have an MSI A75-G55 motherboard, it is crossfire capable, and im thinking about getting 2 Radeon HD 6770 cards to put in, since theyre in my cheap budget. Now i was looking at the specs to confirm my board can handle crossfire, and i noticed something i dont understand, this is what i read
2 PCI Express gen2 x16 slots
- PCI_E1 supports up to PCIE x16 speed
- PCI_E2 supports up to PCIE x4 speed

Now what exactly im asking is what does the X16 and X4 speeds mean,one slower than another? and if so should i even put 2 cards in?

And another question would be, what kind of additional hardware am i looking at to even use crossfire?

My specs are Msi a75-G55 Mobo, Amd A8 3870K APU 3.0GHz, with hd radeon 6550D graphics built in and 4Gb of DDR3 Ram. Any help would be nice, just so i dont waste money on something if i cant even use it.

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a b U Graphics card
March 4, 2012 10:01:03 PM

Without getting into all the details, yes the x4 slot is slower and will be a bottleneck on the second 6770 card. However, the difference might not be as bad as you might think it would. I usually recommend the best SINGLE gpu solution a person can afford over a crossfire/SLI setup because not all games support multiple card setups and also in crossfire/SLI you sometimes run the risk of Microstuttering. Here is an article on this.

Another concern is whether or not your psu will be able to handle 2 cards in crossfire. Which model PSU do you have and what is your budget?
March 5, 2012 3:32:05 PM

I did find a much better deal on an HD 6870, which its rank is a 15 over the 6770s 52. the PSu i have is a Blue Diamond i think 650W PSu. I did look at the article and it does make sense, i figured id go with one awesomely great single card, and not run the risk of bottlenecks and incapatability.
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a b U Graphics card
March 5, 2012 6:55:15 PM

Glad to help :) 
March 5, 2012 9:52:48 PM

Best answer selected by Samtastic06.