My PC has an A8-3870K APU in it, and it can be Hybrid Crossfirex'd with a few cards, with the Radeon 6670 being the best. But there are a bunch of different ones, and there are DDR3 and DDR5 ones. Of course the DDR5 one would be better, but I read when it's Cross'd with an APU it jumps down to DDR3 speeds, and I also read it's not. So I have conflicting reports there. Anyone with any knowledge of APUs know if it slows it down to DDR3 speeds? Also how important are the various speeds on the card? Like core and memory, and the amount of video RAM. And which one performs best in hybrid Crossfirex. Also, don't comment saying "you can't crossfire integrated with discrete", I've seen people say that and they're dumb. I know APUs aren't too popular with enthusiasts, that's why I'm asking cuz it's hard to find info.