Well, they say that 1 (talking about server load as linux shows it) means 100% server load of one CPU core.
On 4 core CPU having server load of 2 would mean 50% server load for that server. 4 would mean 100% server load for that server. But, even with 6 on my 4 core server (which means 150% server load), my users probably wouldn't notice anything wrong. After 8 (200% server load) things starts to be noticeable to outside world.
Bigger problem is, what's causing this server load, is it some kind of unusual event, or something normal. If it is something normal, it's time for new server, or time to discard some of the mods if we talk about vBulletin based sites.
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