I get around 150 users online at a time and it is heavily hacked with lot of mods.
I manage a server running vbullettin forum with 300-500 usual online users. Record is 957 online users 13 hours ago (just checked).
It runs really fine on an Intel Quad Core Q6600 with 2gb ram and 2 simple sata2 raid1 disks. Centos 5.1 64bit (why 64bit are supposed to be bad???), eaccelerator and ioncube (for vbseo), no zend.
The server still has plenty of cpu room. I've an average load of 1.00/1.20 out of 4.00.
Vbullettin database being "just" 600mb in size it's able to run almost completely cached in memory. The server doesn't run any control panel, neither mail servers or a typical hosting environment ... just apache + mysql, and both php and mysql are heavily fine tuned. It still runs a decent number of mods.
I've attached a file of the monthly cpu load. This recent Quad Core 4x2.4ghz cpus really kicks ***. Previously i run one of the first dual core 1,8ghz xeons (before the woodcrest i guess, don't remember), and installing vbseo was really a big cpu hit. While i still was under full capacity i decided to switch to the quad core.
But as you can see i've far more users than 150, so i guess for 150 users it doesn't really matter, as long as you rent (ie are not concerned with power usage) maybe i'd pick the 2.8ghz dual xeon.
Last edited by johnny-l; 12-31-2007 at 04:41 AM.
Reason: attached a file
Any of those dual core processors will be enough. For an SQL server (unless you have horrible queries) you will be hard drive bandwidth limited before you're ever processor limited. Invest as much as you can in faster drives and more RAM if those processors are your starting point.
I've actually had very good experiences with intensive VBulletin sites on amd's. One of my clients has a vbulletin site with ~900 concurrent visitors running on 8 gb ram, 2x dual core opterons and scsi drives.
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