😉 You need a Rad9500 (nonPRO) with 128MB using the 9700PCB. This will be using 256bit DDR but it's pretty useless unless you can enable all 8 pipes like the 9500PRO, 9700 & 9700PRO use. The chances of finding a 9500 128MB on 9700PCB are ever dimishing (they use their own PCB now) and even if you do there is a 25-50% chance at best that you'll enable extra pipes. With only 4 pipes even if you o/c to beyond 9700PRO speeds (400/310 vs 9700's stock 325/310) you'll still be a good 40% slower. Considering how much cheaper 4200 are AND how little more a 9500PRO costs to a 9500 it makes sense not to gamble.
😉 At stock speeds...
9500 is slower than a 4200 and you need to enable FULL AA & AF to slightly get ahead of a stock 4200, the GF4TI were never designed to use FULL AA & AF (medium AA & AF is best).
9500PRO is significantly faster than a 9500 and you're at GF4TI4400 speeds, but enabling full AA & AF you'll be a lot faster than a GF4TI4600/4800. Expect this to o/c to 9700 (non-PRO) perf.
9700 & 9700PRO is the only sure way to 256bit RAM and you're firmly ahead of the other cards, both should o/c well.