1.8 GHz P4 and a 7600GS?

Hello everyone, I have a problem which I would like your opinion on.

I have a 1.8Ghz P4 Sony VAIO, upgraded to 1 gig of RAM, and a nVidia Geforce MX4000.
The problem is that the card only supports DX8. In its initial config the card could only run at minimum settings, but after overclocking it i can run GW at max settings 1280x1024 with -noshaders -dx8 etc getting ~20 fps. (I've overclocked the gpu and memory a good 100mhz each even though it's passive cooled )

I have been thinking about upgrading. I can get a nVidia 7600GS (AGP) 256MB for pretty cheap. My question to you all is what kind of performance can I expect on GW? Obviously it's probably gonna start to be CPU bottlenecked, but how badly? I would finally be getting shader effects i assume ... would AA etc. be possible?

Should be good, i used to run GW with ALL settings maxed, on Sempron 1.81 with an ATI radeon 9200 128mb (agp).

Awesome, thanks for the quick reply. That's my mind made up to get this gfx card then.

I didn't know you could swap vid cards in a VAIO?

This is a Sony VAIO PCV-RX670 desktop with an AGP slot (P4B266LM mobo). I can change pretty much anything in it. Maybe you are thinking of a laptop?

Yes, I thought VAIO's are always laptops>.>

The answer is yes, you will get much better performance. I can run the GW maxed on a Toshiba laptop with a Pentium M 1.6GHz, 1.5GB ram and a Geforce 6600 Go with all the bells and whistles turned on and stay in the 40-70 fps range so upgrading to a 7600GS should allow you to get similar performance.