Quadrofy
Did somebody call my name???
Sorry to disappoint you guys... I've only hacked drivers in order to get Quadro, using rivatuner. You'll find a guide for that in Madonion's forums. As for soldering... I will get around to doing it eventually, but when I do, I'll make a jumper so that I can switch back and forth.
Quadro does not improve FPS in D3D games. It may boost OpenGL games though and is very good for OpenGL graphics art apps.
2 things to look for when starting out with Quadro-modding are GLinfo and GLXcess. The 1st will tell you if the Quadro is working by checking the number of driver extensions, the 2nd is an OpenGL benchmark and its quite pretty too.
In madonion's forum, go to the dispaly adpters/driver section and you'll find a monster thread about Quadro mods. You'll find linkes to the progs I mentioned and also some links to sites that have the hardware version of the mod. I'd also do some searching on x-bit labs for hardware hack guides.