The 9700 should clock @ 275 VPU and 270 Vmem (with DDR effective clock of 540). I doubt the silicon is different in the 9700 and the 9700 Pro but the fan is different. I put a Vantec Iceberg on my office computer's 9600 Pro in 15min for $18. There are quite a few cooling solutions that are better than the Iceberg but it was 5 times better than the stock cooler. Thermaltake, and Zalman make good stuff as do others. I would expect that card to at least overclock to 9700 Pro specs, 325/310, assuming you have a better VPU cooler AND adequate case cooling (one 120mm intake fan + one 120mm exhaust fan in addition to the power supply fans.) In my experience, the VPU can be overclocked quite a bit more than the memory.
It's possible that your card is locked in the bios as referenced in the 3dmark thread. If so, its a bit more work than adding cooling to overclock it.