What computer can I buy that will run PathPilot?

Right now I'm trying to upgrade my Tormach controller, which is march 17 build. I just proved that added memory makes no difference. It came with a single 2gb stick and I put in 2x4. Whenever I run a large program the timer and the RPM and Feed DROs lock or just read zero. I was looking at getting a 1gb quadro card off amazon for 50, but it will probably require a psu upgrade. So a video card won't help me?

are you a tormach customer? if so I would report that as a bug.
i do not believe a video card would do anything and you already found out memory won't.
have you looked at your log files to see if there is anything in them showing what might be happening?