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Will i see a sizeable increase going from the 128M video card to the 256M card
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Well, there isn't really anything that is going to take complete advantage of 256mb of onboard ram. From what I've heard, the 256mb cards are a little slower than their 128mb counterparts because the card is spending more time addressing more memory.
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Raedon ATI 9800 Pro. Why is the sapphire, powercooler and rosemill cards so much cheaper. Are they slower? Do they have different hardware than the true ATI cards?
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They cannot call them ATI-based cards unless they use ATI standards. The reference boards and whatnot I'm sure are the exact same and I would be willing to be too that in order to put ATI's branding anywhere on the box, that ATI is going to test and approve the cards before release. At least I would hope so.
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PCI-Express? Better than AGP 8x?
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PCI-Express is coming. The thing with PCIe is that it can be used for more than video as AGP (accelerated graphics port) like the name says is only video. I use AGP currently though and am not going to buy new hardware just because of PCIe.