[PyroMarkus]

Sorry for disturbing this thread - I didn't want to open a new one since my question is somehow related to this topic:

I have an IBM Server xSeries 235 with certified hardware. At the moment I have one 3.2 XEON 512KB CPU and 2 GB RAM with 3x SCSI 10k HDD at RAID5.

With this configuration I had my maximum (no more users wanted to visit me ) at 554 users online (session time 15 min.) with a load of 2, with some peaks to 3.

First question: what maximum users would you expect with this configuration before the site breaks down?

Now I would update with a second 3.2 XEON CPU and +2GB RAM, so in total 4GB RAM.

Second question: what maximum users would you expect with the new configuration before the site breaks noticably down?

I run a vB 3, photopost, vAdvanced portal and a MediaWiki on that server.
I know, this depends on a lot, but just a rough number of maximum users. 800, 1000, more?

BTW - what are the specs for the server running vBulletin.org? You have almost always +1000 users and very good response times...

Thanks a lot,
yours
Pyro