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I've got the 22" Asus (A-sUs I guess it is, although I would say A-sus) and run at 1680x1050 with no probs. However, I want to say that with the larger sizes and more pixels it really depends on the manufacturer of the lcd. I'm not sure if Asus is the actual manufacturer of the screen or if they just source the parts and assemble them.
Therefore, I would only buy from someone that I trust will stand behind the product and support me to the manufacturer and that I trust will not delete negative reviews on the website. A few extra bucks for that kind of assurance is worth it IMHO.

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i read somewhere that there are only 2x ACTUAL manufacturers,and that's samsung and don't quote me,but i think the other is sony.
i'm not sure if that is still the case.