Well, a lot will "fit". However, if you mean are validated, check Asus's support site (usually not much help) and GSkill's site (usually much better) to see which have been tested.
If you actually mean literally fit, it is DDR2 800 1.8V
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Notice: Only DDR2-800 memory supporting JEDEC approved 1.8V operation with timings of 5-5-5 or 6-6-6 is supported on Intel Desktop Boards based on Intel 965 Express Chipsets
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From the Newegg site for your board.