They will ALL CF very well. Those are top tier brands. You do realize that crossfire ready certification is nothing but a marketing gimmick right? Like SLI ready memory. It means nothing.
Well, that's sort of right and sort of wrong. While a lot of power supplies will list themselves as SLI-ready or Crossfire-ready, to be certified entails the ps company actually sending units to either ATI or nVidia for testing and certification. And both companies charge for this certification, much like the 80Plus organization charges for their testing and certs. for efficiency ratings.
And usually you'll see a power supply certified as SLI or Crossfire, not both. That's due to both companies not wanting both of their logos appearing on boxes side by side. But getting certified by one means it'll pass the other's cert.
As for memory being "SLI-ready,' yes, that's a pure marketing gimmick. And from all the memory I've come across from Mushkin, Corsair, G. Skill, OCZ, Kingston, Crucial...the only one that puts "SLI-ready" on its memory is OCZ.
I looked at all those power supplies you listed Meghan. I couldn't find a TPN-750, but I found a TP-750, are they the same? Also, none of your top three were listed as crossfire ready. That's definately an option I'd like to keep open to myself down the road. Even though they're not listed as being crossfire ready, will any of those three do crossfire well?
Yes, the TP-750 is what I referred to as the TPN-750....True Power New. Just as Antec has used the word "New" in their description of that ps to distinguish it from previous iterations of the True Power, I use TPN to make sure one knows I'm not speaking about anything but the True Power New. Previous versions of the True Power from Antec were less than overwhelming in their performance and were a far cry from this newest version of the TP.
And, yes, it will Crossfire. And it is listed on ATI's site as certified for Crossfire. But even if it wasn't, it's a high quality power supply with enough amps on each +12V rail to handle Crossfire within reason....I wouldn't try using it with a pair of 5970's, obviously.
What both ATI and nVidia are trying to accomplish with their SLI/Crossfire cert. of power supplies is to keep people from buying inadequate or poorly designed power supplies and trying to Crossfire/SLI with them and having horrible failures.
But, even buying from a "name brand" doesn't always keep failures from happening. PC Power and Cooling's first attempt at a 1kw power supply is an example. It was a tri-railed power supply that was badly designed in its rail distribution. It put all the PCI-e, SATA, and Molex connections on one rail which could only support 35A on it. So, when people began SLI'ing a pair of like 8800GTX video cards, the power supply would shut down during heavy use, like in gaming.
PCP&C's solution wasn't to fix the rail distribution but to make it a single rail power supply...the "easy and cheap" fix.
But, all three I listed will Crossfire/SLI within reason, as mentioned.
You can get up to a decent 1200W PSU for that much money!
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