I tried this combination on my small pc (celeron 2.4ghz 512mb ram,128mb nvidia geforce fx5500). The lag was great and the difference was noticeable, actually no, I couldn't play it at all on linux. But if you have a powerful machine you ( I cannot try it on my primary pc 'cause I have an unsupported combination of ati-xorg-64bit issue) could say that from feedback of other users I read in forums it plays well except some minor crashes that can be fixed if you follow what cedega is suggesting. Sorry I don't know if it supports this resolution you are asking.
In a summary, yes there is a difference at performance of the game.
Cheers,
Vangelis
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