theoretically yes, but i am sure, there will be at one point issues with thermal envelope. so practically i would asume you will be able to upgrade for a while and then it will be not possible anymore. pci-e is a new standard, so i think its save to say it will be around for a couple years till we get sth new. will it be userupgradeble? poss with restrictions, even for the x800 ppl had to send in their older models for heatprotection mods.