DDR333 Memory For 166 MHz FSB
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| Processor | PCI Clock | AGP Clock | Bus Clock |
|---|---|---|---|
| Athlon XP 2300+ | 38,5 MHz | 76,9 MHz | 155 MHz |
| Athlon XP 2200+ | 37,2 MHz | 74,4 MHz | 150 MHz |
| Athlon XP 2100+ | 34,5 MHz | 68,9 MHz | 139 MHz |
| Athlon XP 2000+ | 33 MHz | 66 MHz | 133 MHz |
| Athlon XP 1900+ | 33 MHz | 66 MHz | 133 MHz |
| Athlon XP 1800+ | 33 MHz | 66 MHz | 133 MHz |
| Athlon XP 1700+ | 33 MHz | 66 MHz | 133 MHz |
| Athlon XP 1600+ | 33 MHz | 66 MHz | 133 MHz |
| Athlon XP 1500+ | 33 MHz | 66 MHz | 133 MHz |
| Athlon 1400 | 33 MHz | 66 MHz | 133 MHz |
| Athlon 900 | 33 MHz | 66 MHz | 100 MHz |
In order to operate the Athlon XP at a maximum clock speed of 1866 MHz, we increased the Front Side Bus and memory speed to 155 MHz (12.0 x 155 MHz = 1866 MHz). Such a clock speed is not possible with normal DDR SDRAM modules (PC2100 or DDR266). For this reason, we used the fastest DDR333 module, which is suited to running at 166 MHz. In the near future, new memory modules that run up to 266 MHz (DDR400 and DDRII/533) will be available. According to the SiS roadmap, the corresponding chipsets should begin to make their appearances starting in July or December of this year.
Memory modules compared (from top to bottom): DDR333, DDR266 and RDRAM with PC800.
