system requirments Options

[ectomorpheus]

I was reading about the recomended system requirments for oblivion, and I wan't sure about my vid card. here is what I have:
p4 3.2
socket t lg775 mobo, 915p chipset
1 gig of ddr2 duel chanel
2 150 gig sata drives at raid 0
gigabyte geforce 6600gt

I thought about upgrading since bethesda recomends a 6800 or higher, but I would prefer to wait for a directx 10 compatible card so I will be ready when games start to take advantage of it. do you guys think my 6600gt card will slow me down very much?