The 6600 DDR2 uses the same NV43 graphics core as the other cards in the 6600 series. The NV43 core features 8 pixel pipelines, 3 vertex shader units, and a 128-bit memory bus. It has around 143 million transistors and is built on an 110nm manufacturing process by TSMC.
Compared to ATI's X1300 Pro, the 6600 DDR2 looks like a good match on paper. The 6600 DDR2 has twice the pixel pipelines, but thanks to the extreme core clockrate of the X1300 Pro, both cards are comparable: the 6600 DDR2 has an advantage in texel fillrate, but lacks pixel fillrate power when compared to the X1300 Pro. They both have the same 128-bit bus and same 400MHz memory, so they both naturally end up with the exact same raw bandwidth numbers. Both cards, of course, also support Shader Model 3.0.
Here's a breakdown:
| XFX GeForce 6600 DDR2 | GeForce 6600 GT | Radeon X1300 Pro |
Radeon X700 Pro | |
| Core | NV43 | NV43 | RV515 | RV410 |
| Silicon Process | 110nm | 110nm | 90nm low-k | 110nm |
| Transistor Count (millions) |
143 | 143 | 100 | 120 |
| Core Speed MHz | 400 | 500 | 600 | 425 |
| Memory Speed MHz | 400 | 500 | 400 | 432 |
| Memory Size | 256 MB | 128 MB | 256 MB | 256 MB |
| Bus Standard | PEG 16x | PEG 16x | PEG x16 | PEG x16 |
| Bus Width | 128bit | 128bit | 128bit | 128bit |
| Pipeline Configuration Textures/Pixels/Z Samples (Per Clock) |
8/4/8 | 8/4/8 | 4/4/4 | 8/8/8 |
| Vertex Units | 3 | 3 | 2 | 6 |
| Peak Memory Bandwidth (GB/s) |
12.8 | 16.0 | 12.8 | 13.8 |
| Pixel Fillrate (million pixels/sec) |
1,600 | 2,000 | 2,400 | 3,400 |
| Texel Fillrate (million texels/sec) |
3,200 | 4,000 | 2,400 | 3,400 |
| API Compliancy | DX 9.0c Shader Model 3.0 |
DX 9.0c Shader Model 3.0 |
DX 9.0c Shader Model 3.0 |
DX 9.0b Shader Model 2.0 |
Infineon DDR2 2.5ns Memory Module