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| SIS648 Chipset The Name of the Bandwidth | ||
| (Review by MS, July 24, 2002) |
Memory Performance
The reference board has a multitude of different memory ration settings that would fill some 10 pages right here but we are only interested in whether the new chipset manages to increase the performance at the fastest speed, that is DDR400 or PC3200. We were able to post at 200/400 MHz and 2:2:2 timing settings but there was not enough stability to complete a boot into WinXP. The default setting for DDR400 operation is 2.5:4:4:7 and we have to give credit to SIS to not offer any bogus settings like CAS=3 that are not supported by the current DRAM technology but instead sticking with the facts.
SiSoft Sandra 2002
SiSoft Sandra buffered memory bandwidth at default setting. Those scores are nothing short of excellent.
SiSoft Sandra buffered memory bandwidth at 2.5:3:3, we managed to squeeze a bit of extra performance out of the system.
SiSoft Sandra memory bandwidth on the SIS 645DX-based ASUS P4S533, the SIS648 reference board at the "slow" setting (2.5:4:4) and "fast" (2.5:3:3) and the Iwill P4R533N as i850 dual PC1066 Rambus system. Compared to the dual Channel Rambus system, the SIS 648 chipset still falls a little short but Sandra is a synthetic benchmark and we'll see some different scores in other benchmarks. (Int scores: grey; Float scores: red). Important is that there is an improvement over the SIS 645DX chipset, even if it is only minor.
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