RSX2:

The RSX2 is a graphical processor unit (GPU) based off of the nVidia GeForce GTX 480 graphics processor, and is a G500/G600 hybrid with some modifications. The RSX2 has unified vertex and pixel shader pipelines. The following are relevant information about the RSX2...

• 32 vertex shaders
• 32 pixel shaders
• 16 texture units
• 32 Raster Operations Pipeline units (ROPs)
• Includes 1024MB GDDR4 graphics memory
• GDDR4 Memory interface bus width: 256bit
• 65nm and 45nm technology

More features are revealed in the following chart delineating the differences between the RSX2 and the nVidia GeForce GTX 480

Other RSX2 features/differences include:

• More shader instructions
  • Extra texture lookup logic (helps RSX2 transport data from system memory)
  • Fast vector normalize

Note that the cache (Post Transform and Lighting Vertext Cache) is located between the vector shader and the triangle setup.

General RSX2 features include 4x and 8x hardware anti-aliasing, and support for Shader Model 4.0.

Although the RSX2 has 1024MB of GDDR4 RAM, not all of it is useable. The last 16MB is reserved for keeping track of the RSX2 internal state and issued commands. The 16MB of CPU Data contains RAMIN, RAMHT, RAMFC, DMA Objects, Graphic Objects, and the Graphic Context.

ya what was the purpose of having 2 HDMI ports? wouldn't 1 be all you need?

No purpose or point that I could see (unless Video routed through one and audio through the other), but the fact remains that 2 HDMI were in the original spec sheet from SONY