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Can i crossfire 2 amd 7970 one in  pcie 3.0 x4 and one in pcie 2.0 x4 ?

what kind of mobo ?

You could xfire them , but the perf might not be great .

Recommend what is best, not what you preffer.

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You are definitely looking at loss in performance of the second GPU. To be honest, about 10% loss, and that aint cool  :P

Mobo: Gigabyte 970A-DS3P CPU: AMD FX 8350 RAM: Kingston HyperX Fury DDR3 8gb (2x4gb@1600Mhz) GPU: Gigabyte R9 280x (factory oc) PSU: Thermaltake SmartSE 730w Case: Corsair 200R

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but is possible the crossfire ?

Oh yes, as long as your mobo supports corssfire and you are fine loosing a bit of performance it's all good!

Mobo: Gigabyte 970A-DS3P CPU: AMD FX 8350 RAM: Kingston HyperX Fury DDR3 8gb (2x4gb@1600Mhz) GPU: Gigabyte R9 280x (factory oc) PSU: Thermaltake SmartSE 730w Case: Corsair 200R

Blog thingy <----

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to answer your second question, no you don't get 6 gb of ram. the way crossfire works is that the gpus work separately so you get the same 3 gb of ram.

My rig:
CPU: i5 4690k 24/7 @4.4ghz (1.165v) Max 4.7ghz (1.325v) COOLER: NZXT Kraken X61 MOBO: Asus Z97-A   RAM: 16GB Crucial Ballistix Tactical   GPU: EVGA GTX 970 SSC   PSU: EVGA GS 650W   CASE: NZXT Phantom 530 HDD: WD Caviar Blue 1TB + WD Black 2TB

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why i dont get 6 gb ?

The ram is mirrored so it's effectively 3GB even though all 6GB is used.

 

UP

Please be more patient as to wait for more than 20 minutes before bumping for an answer..

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