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Gigabyte GA-P35-DS4 crossfire?

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I was wondering if this board is crossfire compatible, it has two slots but one is x16, the other is x4....what does this mean?
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I basically means that if you crossfire the board, the vga card near the northbridge will operates at PCiE x16 and the bottom one will operates at PCiE x4, thus hampering your crossfire performance :)

P35-DS4 = great overclocking motherboard :)
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Just to clarify that what fenzodahl512 said......
The P35 north bridge is limited to x16 slot and x4 slot crossfire, while it's bigger brother, x38 can achieve dual 16x.
Now what does this x16 and x4 slot translate to and what exactly does it mean?
Basically it's a reference to the transfer speed or bandwidth of the bus. x16 has a bandwidth of 8GB/sec and x4 has a peak bandwidth of 2GB/s. Therefor, if you get one of the newer cards, it will not be able to operate to it's full potential on the x4 bus, because the card is capable of transferring more information then what the x4 bus is capable of carrying. Keep in mind that we are just beginning to be able to fully saturate the PCIe x8 slots.
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