I'll just throw into the mix... if you need to use alpha blending, I would step away from UnDelphiX... I tried it for our competition entry way back in 2006 (IIRC). With no alpha, UnDelphiX was acceptable (note... I only said acceptable). With alpha, it practically ground to a halt.

I wrote a proof of concept piece to test out OpenGL and alpha blending... on the same hardware it was significantly faster (UnDelphiX managed single figure frame rates, whilst OpenGL managed triple digit frame rates).