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| SIS Xabre600 Vertexilisers and Ximiators | |
| (Review by MS, Nov 26, 2002) |
Some specs
Pixel pipelines, texture units, core and memory speed, after awhile it all becomes a blur. Moreover, trying to calculate fill rates according to the specs, for single and multi-texturing passes is where it gets really confusing. To make things easier, we have everything at one glance.
| GF4 TI4600 | GF4 TI4200 | RADEON 8500 | RADEON 9000 | RADEON 9700 | Xabre600 | |
| core clock | 300 | 250 | 275 | 275 | 325 | 300* |
| Pixel Pipelines | 4 | 4 | 4 | 4 | 8 | 4 |
| Texture Units/Pixel Pipeline | 2 | 2 | 2 | 1 | 1 | 2 |
| Fill Rate (Single Texture) [MPixels/sec] | 1200 | 1000 | 1100 | 1100 | 2600 | 1200 |
| Fill Rate (Multi Texture) [Mtexels/sec] | 2400 | 2000 | 2200 | 1100 | 2600 | 2400 |
| Memory Clock [MHz] | 650 | 500 | 550 | 550 | 620 | 600* |
| Memory bus width [bit} | 128 | 128 | 128 | 128 | 256 | 128 |
| Memory Bandwidth [GB/sec] | 10.4 | 8.0 | 8.8 | 8.8 | 19.84 | 9.6 |
| Vertex Shaders | HW | HW | HW | HW | HW | Vertexilizer |
* the SIS control panel showed 314 MHz for both core and memory which increases the benchmark scores by up to 5%
Test Candidates and Platform Specs
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* Compared to our earlier review, using the SIS 648 Reference Mainboard with DDR400, the RADEON 8500 performed somewhat worse on the Intel i845PE platform. We tried using the older 7.74 drivers but it did not improve performance in some of the 3DMark2001 categories. Another possibility is that the performance was influenced by the OS (Win2K vs. XP) however, only some benchmarks were influenced which we note for the record.
** the i845PE does not support AGP 8X which puts a theoretical handicap on both the SIS Xabre600 and the ATI RADEON 9700, however, the difference between AGP 8X and AGP 4X that we measured earlier was in the order of 0.1-0.3%. In so far, the use of an AGP 4X system is justified, particularly in light of the issues between the SIS 648 chipset and AGP 8X graphics adapters.
*** Hyperthreading was enabled
**** Memory frequency was set to DDR333 with 2:2:2:6T latencies. The Intel DDR chipsets are natively running at a 1T address and command decode latency with 4 bank interleaving turned on by default.
Time to move on ...
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