this one, right?
ok.. It looks like your mobo supports only ddr2. Anyway your Os will recognize until a max of 3GB only if you're under Windows 32bits even if you put 4GB RAM. So, not sure it worths the shot spending such a cost only for 1GB more. So the cheaper would be the better.
By the way, is your bios up-to-date? Because I saw some updates\fixes for some issues related at the display.. https://www.asus.com...pDesk_Download/