visiontek has a lifetime warranty, and i think powertek was already benchmarked and received good frames per second, saphire and msi are decent brands, so far it wont make a difference really, they are all the same card just different brands, i would get the visiontek because it already has 13 5 star ratings on newegg and has a lifetime warranty, or wait for the 4870 or for a dual slot cooling to be released on the 4850
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