The Pro uses the same RAM heatsinks as the Ultra, the core heatsink is smaller and uses the regular Heatsink found on the older 64Mb Geforce GTS. I was able to overclock the core to 235Mhz, the ram gave much greater overclocking results, I was able to take the RAM all the way up to 495Mhz, above this speed this actually caused slowdowns in 3dmark and other games, just the same as I found with the Hercules Ultra. Again I used Nvidia drivers 6.47 and Nvidia Coolbits reg file to overclock the graphics card

Nvidia Coolbits.reg available here, showing the default Hercules Pro core and memory speed.

The Hercules Pro as recognized in windows display settings

The Specs

• Incorporates NVIDIA™'s latest Graphics Processing Unit (GPU) performance leader, GeForce2 Pro, optimized for DDR
• Hercules runs its 3D boards at the fastest achievable speed. With specially adapted RAM heatsinks, Hercules gives 3D Prophet II GTS Pro stability at higher clock rates.
• Ultra-fast 64MB DDR memory offers turbo-boosted 3D performance in games requiring large texture buffers. This enables it to:
  - load and map textures more quickly
  - increase the benefit of GeForce2 Pro's multiple pipelines architecture
  
• 4 dual-texturing pipelines, mapping 8 texels per clock cycle to generate 1.6 GigaTexels per second and 25 million triangles per second for mind-blowing frame rates
• 200MHz core clock, 400MHz DDR RAM clock delivering a 6.4GB memory bandwidth
• 4X AGP with Fast Writes / AGP 2X compatible

• Incorporates NVIDIA Shading Rasterizer (NSR): delivering complex per-pixel shading for greater detail and boosted visuals

• Hardware Transform and Lighting Engines
• Hardware Full Scene Anti-Aliasing (FSAA)
• Most advanced supports for OpenGL® (Silicon Graphics) and DirectX®7 (Microsoft®) such as cube environment mapping, vertex blending and projective textures. Texture Compression support on D3D and OpenGL®

• TV/Video Output for playback of DVD titles or games on your television: NTSC and PAL TV output in 640x480and 800x600

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