I am using an ATI X1300 PRO 256MB DDR2 ram, which I believe is a lesser one
than you have and use "glass" with full transparency with no problems! I do
prefer ATI cards however. This one only has 4 pipes and costs less than $100
on NewEgg!
As long as the card support the following specs:
DirectX 9 compliant with Pixel Shader 2.0 support (32 bits per mixel and
Windows Display Driver Model (WDDM) support. Minimum memory 128 MBs, I have
a Geforce FX 5200 128 MB AGP and I don't even get Glass anymore.