The card sounds pretty promising, and Trident's confidence seems more credible than Matrox's one on Parhelia. I doubt Parhelia even had expected performance percentages.
In any case there isn't much info so far on the XP4, but the results of how they will do it, seem pretty logically working, however the lack of info removes any hype we might have, surrounding AA, Aniso, and other things. However the companies have got to learn, use Xbar memory controller interfaces, enhance bandwidth, use Occlusion Culling, don't just rub the bandwidth to such heights with nothing to use it efficiently!
In any case, for such price, IF the performance overall is 80% of the Ti4600, I think it will be a very nice comeback from Trident, and a very nice seller. Perfect OEM card as well, that would save the poor MX and TNT2-to-be-owned Dells from being sold!
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Is the opportunity to earn money by working, free?