Matt wrote: > back I see is the max RAM on i386 but perhaps I am wrong. 90 percent > of our CPU load is Spamassassin. Disk I/O is likely a big bottle neck Are you using spamd? I ask, because me mate's system was rather busy, and it transpired he wasn't. Other than extra RAM, AMD-64 CPUs have more registers, and they work best with 64-bit code, so for CPU-intensive work you should see better performance with 64-bit Linux than with 32-bit. -- Cheers John -- spambait 1aaaaaaa at coco.merseine.nu Z1aaaaaaa at coco.merseine.nu Please do not reply off-list