Any gain at all?

[zalazin]

I currently have a SFF with onboard Geforce 7100 using 256 Shared Mem
This is a Zotac 630I Mini ITX MOBO with 2gigs DDR2 667. 500gig Seagate SATA 3.0
Asus DVD PATA burner, Celeron E1200 DC and a Sparkle SFX 200 Watt PSU.
Win XP Pro

THe MOBO has 1 PCIe 1X slot
I have found this:

http://shopper.cnet.com/graphics-ca...raphics/4014-8902_9-32853796.html?tag=lst;prc

I know that PCIe 1 X is only 250 one way or 500 up and down.

I am after maybe 25-30 FPS in BIOSHOCK and Fallout 3 at low res 640X480 or 800X600. This is not my main rig It is a portable I take to work plug into a kvm switch and game at lunch.
Currently I get 15 to 20 with textures turned down. Also My maximum power draw at the wall is 85 watts.
Will the 1x slot defeat any gain I might get?

Honest answers please. I don't expect quad core gtx 280 1650 X1080 performance here. Hopfully a 5 to 10 fps gain if at all.

Thanks