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Can I enable Crossfire with a Radeon HD 7850 and a Radeon HD 57xx?

Last response: in Graphics & Displays
November 26, 2012 1:57:08 PM

I've been running a Radeon HD 57xx (I forget the actual model number and I'm too lazy to take it out of my case right now), and I'm getting a Radeon HD 7850 in the mail today. Can I use Crossfire with these two cards or are they too far apart in model number? Would it be worth it, or even practical? I do have two monitors and I do game. My specs are as follows:

MB: MSI 890GXM-G65
Graphics card: Radeon HD 5700 series
CPU: AMD Phenom II X6 1100T 3.3GHz
RAM: 2 x 4GB DDR3 Corsair Vengeance, 1600MHz, 9-9-9-24
Hard Drives: 2 x 1TB Western Digital disk drives
OS: Windows 7 Home Premium 64-bit

Any info I missed? Any help is appreciated, I've only been able to find articles about Crossfiring two identical cards and two cards that differ slightly but are very close in model number.
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November 26, 2012 2:34:08 PM

in SLI u have to take two Exactly same graphics cards to SLI,
in AMD u can CFX the same family,
in AMD
1st number is for generation,
2nd is for family,
so put in the simplest way the 1st 2 digits should match like 78xx or 79xx