There are a lot of variables to consider but...
- What is your server setup (cpu, memory, etc)
- How many active domains on it?
- How much monthly traffic is the server generating?
I just got a quad CPU 2.8 Xeon w/4 GB RAM and I'm hoping this will suffice to host about 325 domains. These domains right now are hosted on two P3 servers w/1 GB RAM each but the servers are having a hard time pulling the load at peak times. I hope the new server can cope.
It definitely won't do any worse than 2 P3's. I'd head over to webhostingtalk and run a search for "benchmark". There's a huge thread with many different systems and their benchmark results on a standardized test. I'd be interested in seeing how that P3 does. I have a P4 1.7ghz that clocks at a score of about 50. It doesn't have any websites on it. I have some dual opteron 285's and some dual xeon 5150's w/ 500 to 1000 sites on them. They run without incident. Almost to the point of complacency. And thats not good either
The one w/ most accounts:
Dual Opteron 285
6GB Corsair ECC Registered RAM
2 port 3ware 8000 series
2 500GB Hitachi SATAII RAID1
1 320 GB Backup SATAII
Tyan 3870 Mobo
Antec tower case/PS
Uses about 2.2 amps under load.
top - 22:47:48 up 18 days, 7:16, 2 users, load average: 0.45, 0.59, 0.63
Tasks: 185 total, 2 running, 182 sleeping, 0 stopped, 1 zombie
Cpu(s): 6.2% us, 1.5% sy, 0.0% ni, 92.3% id, 0.1% wa, 0.0% hi, 0.0% si
Mem: 6228076k total, 6135164k used, 92912k free, 334452k buffers
Swap: 3068372k total, 128k used, 3068244k free, 4552508k cached
(Updated the kernel 18 days ago)
The Intel have almost same setup. Run well too but not the perfect price/performance ratio for my particular situation.
AMD setup (and Intel for that matter) runs perfect all the time (EVEN exim/spamassassin) and very cost effective hardware. Hardware was the result of months of study trying to get the absolute most server for the cheapest cost, with all parts working together. I built about 12 and they house what was about 25 older style Dual XEONS's that crashed every day all day for every reason in the book.