___The AMD XP series CPUâ€™s have a performance rating instead of actual MHz listed to better market themselves against the P4â€™s and rightfully so. The XP 1800 + is actually clocked at just 1.53 GHz whereas the XP 2100 + is a 1.7 GHz part. The PR ratings are pretty close to true to life in comparison to a P4 w/ similar memory configs (SDRAM/SDRAM â€“ DDRAM/DDRAM) as well as chipset configuration (KT133A/I845 â€œSDRAM specâ€™edâ€ â€“ KT266A/I845D â€“ KT333/I845E-G). In other words, an 1800 + is ~ equivalent across a number of benches to a 1.8 GHz P4. This is not the case in all benches as the AMD CPUâ€™s have a large FP advantage over the P4â€™s in particular but overall, the PRâ€™s (performance ratings) are pretty close.
___As for the BIOS update, I looked it up at the Asus website and you need at least the 1007 for proper AMD XP CPU recognition. Asus is adding 48 bit addressing for larger than 120 GB HDâ€™s on a number of their older boards so make sure you try the 1009 out in particular.
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