Better video cards for the new 8-core Mac Pro...?

I don't know a ton about video cards. I did some research and the internet says that the Nvidia GeForce GTX 295 video card is the best card out right now. Will it work in the 8-core macpro? If not, or if it's not the best, what is the best video card that will work in the 8-core macpro?
P.S.
Does anyone know how to tell exactly whether a video card is better from another? I mean I can guess a video card at 1792MB is going to be better then one at 512MB, but I've also heard that, for example, the ATI Radeon HD 4870 512MB is better then the NVIDIA GeForce GT 120 512MB, and apple charges more for it so it probably is better, but all that tells me is the name of the cards, and that they are both at 512MB, so from that without any other information I would assume they're exactly the same just made by different companies, but there must be some other details that would explain why it's better right? Thanks in advance

Well I found out the Quadro FX 4800 works on it, that looks pretty good.
It's a good card, but it has a different application focus.
What applications do you use?
Answering that helps determine what the best card is.
The 5800 is better though, will it work?
Better, how?
The spec's read better?
How about real world performance?
Benchmarks?
They are very similar in shape and such.
Shape has little to do with anything.
The ROM is the key.
If the card is not produced as "OS X compatible", it does not have Mac ROM and cannot be used.
If there is a Mac edition that is similar (same GPU series, similar architecture) the ROM may be flashed to Mac ROM.
Especially in Geforce cards, the ability to edit ROMs and even write portions of the ROM is necessary to be able to flash a card.
Even then, no guarantees.
Often a port on a flashed card won't work after flashing.
Seems the 5800 has a 10 bit display port, so if the card were flashable, the display port wouldn't work.
The ROM chip size of a card is also of concern.
Many cards require either a new, larger ROM chip to accept the Mac ROM (soldering), or, require a hacked, "reduced" ROM to be written to allow flash.
Invariably, there will be some feature loss with a reduced ROM, but a good hacker usually gets rid of superfluous stuff.
Cards with more VRAM than the Mac counterpart will often times lose the extra VRAM- it won't be read by OS X.
Then there is the EFI question, which often creates a final stumbling block for converting a card.
There are many pioneers who flash cards.
If a card is flashable, it has already been done.
The Quadro 4500, 4800, and 5600 have all been worked out.
As of yet, the 5800 hasn't been sussed out for flash (as far as I can find).
Flashing the card is easy.
Finding a physically compatible card and a compatible ROM are the hard parts.
The two best retail cards for the Mac Pro are the Geforce GTX 285 and the Radeon HD 4870.

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