October 10th, 2005, 13:12 PM
ATI X1000 Family
The first R520 based GPU, was released on October 5th and is built on a 90nm process. The R520 core is the successor to the R480 core of the Radeon X850 and is based on an entirely new design featuring SM3 support, Adaptive Anti-Aliasing and built in H.264 hardware decode assistance - part of ATI's Avivo technology and the encoding standard for both BluRay and HD-DVD. H.264 decoding requires significant processing - a 3.6GHz P4 runs at around 90 - 95% CPU usage without acceleration, compared to around 33% with R520 GPU acceleration. The architecture of the R520 features 16 pixel pipelines and 8 vertex shaders, compared to it's predecessors 16 pixel and 6 vertex pipelines. The core is significantly enhanced compared to it's predecessor and able to run at a much higher clock speed of 600MHz+. The memory controller of R520 is improved over the previous R4xx generation with ATI using their 512-bit ring bus memory controller (this is an internal GPU bus, however - the path to on-board memory is still 256-bit). Comparing the X1800 XT to the GeForce 7800 GTX we can see that the fill rate of the top end cards is slightly lower for the X1800 (16 pipes x 625MHz = 10000 compared to 24 pipes x 430Mhz = 10320 as a rough guide), but it has the advantage of additional memory bandwidth (1.5GHz compared to 1.2GHz) and a potentially more optimised core. Of course, the differences in architecture of the GPUs does mean that these numbers may not equate to real world performance.
- Radeon X1800 XT 512MB - 625Mhz core, 1.5GHz GDDR3 memory - $549
- Radeon X1800 XT 256MB - 625Mhz core, 1.5GHz GDDR3 memory - $499
- Radeon X1800 XL 256MB - 500MHz core, 1.0GHz GDDR3 memory - $449
Based on the R520 architecture, but with a reduced number of Vertex (12) and Pixel (5) shaders and a 256-bit rather than 512-bit ring bus, the RV530 is aimed at the Mid Range to Mid Range performance market. The XT Edition features a core clock speed of 590MHz interfacing to 1.38GHz GDDR3 memory over a 128-bit bus. The RV530 is expected to be released in both XT and Pro forms, with the two cards offering the same architecture, but different clock speeds.
- Radeon X1600 XT 256MB - 590MHz core, 1.38Ghz memory - $249
- Radeon X1600 XT 128MB - 590MHz core, 1.38Ghz memory - $199
- Radeon X1600 Pro 256MB - 500MHz core, 780Mhz memory - $199
- Radeon X1600 Pro 128MB - 500MHz core, 780Mhz memory - $149
Cut down version of the R520 core. Features 4 pixel pipelines and 2 vertex pipelines with up to a 6000MHz core and 800MHz memory clock interfacing over a 128-bit bus.
- Radeon X1300 Pro 256MB - 600MHz core, 800MHz memory - $149
- Radeon X1300 256MB - 450MHz core, 500MHz memory - $129
- Radeon X1300 128MB - 450MHz core, 500MHz memory - $99
- Radeon X1300 Hypermemory (32MB/128MB) - 450MHz core, 1GHz memory - $79
Last edited by Reverend; October 17th, 2005 at 18:25 PM.