The initial problem: New computer, slow CD burning. Computer is stuttery while burning CDs.
Here is a sample of the solutions that people are offering:
"Did you try leaving the RAM at the speed, timing, and voltage at which the Bios detects it?"
"sounds like a potential PSU problem to me...what psu are you using?"
"You might try giving the RAM some more voltage, and maybe lowering the timings to 4-4-4, if it is stable at that setting."
"Too much load on a single circuit? Would be my guess anyways, although I remember seeing some article or post somewhere recently about how newer circuits are being built to include extra devices that will break the circuit during moments of instantaneous high loads/rapid load fluctuation, similar to what happens when a high-end PC is turned on."
"Try taking every screw that's holding your motherboard down out, and put the piece of anti-static plastic that it came in underneath it. Then, turn it on (with it laid on it's side, and no screws screwed in), and see what happens. It almost sounds as if you've got a short somewhere."
If it wasn't PCIe someone would have suggested changing the AGP aperture size.
Another favorite, not from this thread but on one of the Anandtech forums a while back: "Shut off your computer and let it sit for thirty seconds to make sure the memory clears."