based off the sx2802-01 (which is an older model) that one has a pci-e16 slot, in which case yours will to. So you can pretty much buy any graphics card you want that supports a pci-e 16 slot. so yeah, any graphics card thats gonna be like, geforce6x series and newer.
point being, you can buy basically any grahpics card you want.
hope that helps