ATI Radeon X800 PRO
Product | Radeon X800 PRO - ATI R420 | Radeon X800 XT - ATI R420 |
Process | 130nm @ TSMC low-k | 130nm @ TSMC low-k |
Transistor Count | 160M | 160M |
Geometry Pipeline | VS2.0* | VS2.0* |
Fragment Processor | PS2.0* | PS2.0* |
Fragment Processor Setup | 2 full (vector/scalar) ALU (not equal), one texture ALU, F-buffer | 2 full (vector/scalar) ALU (not equal), one texture ALU, F-buffer |
Fragment Processor Precision | FP24 | FP24 |
Traditional Render Setup | 12 x 1 | 16 x 1 |
Vertex Shaders | 6 | 6 |
Basic Texture Filtering | Trilinear | Trilinear |
Texture Filtering | Bilinear, Trilinear, 16X Anisotropic | Bilinear, Trilinear, 16X Anisotropic |
Antialiasing | Multi-sampling | Multi-sampling |
AA Sample Type | Scattered/sparse grid, up to 6X | Scattered/sparse grid, up to 6X |
Bus Support | AGP8X | AGP8X |
Memory support | GDDR3** | GDDR3** |
Basic Core Frequency | 475MHz | 520MHz |
Basic Memory Frequency | 900MHz | 1120MHz |
Memory Bus Width | 256-bit, 4 partition memory crossbar | 256-bit, 4 partition memory crossbar |
Basic Pixel Fillrate | 5700Mpixel/sec | 8320Mpixel/sec |
Basic Multitexture Fillrate | 5700Mtexel/sec | 8320Mtexel/sec |
Basic Memory Bandwidth | ~28.80GB/sec | ~35.84GB/sec |
With all the same basic rendering features intact, the differences between the PRO and XT are easy to spot. One quad pixel pipe less than XT and a drop in core and memory frequency are what define the PRO.
Pixel and texel fillrate are some 70% of the XT, while memory frequency is 80% of its bigger brother. A sizeable step in performance and one that should easily mark out a noticable difference between the two.
Let's have a look at the reference board.