...if you have games that scale well with the number of cores, you might want to get as many cores as you can
Trouble being that most (maybe all?) of today's games really don't scale well with the number of cores that you apply to the problem, so if what you want it for is to play today's games, then getting lots of cores is a bit of a bust. There are suspicions/rumours/predictions that tomorrow's games
will scale well over multiple cores, but, hey, that's tomorrow. and, to quote a phrase "prediction is always difficult, especially when its about the future".
On the other hand, if you've got a more general purpose computing problem - maybe folding@home or something- more cores is good.
If you look here
'prices', you'll see that for $400 you could (nearly) get two E5310s, for $500 E5320s, and for just over $600 E5335s. (I've cheated slightly with the prices as those are presumably tray prices and aren't valid until sometime in July.) So, in each case, that will give you 2 by four core parts and as far as execution architecture is concerned those are the same as Conroe parts, but with more cores and more cache.
Now I agree that RAM will cost you more and the cheapest server motherboards tend to be around the price of the top of the range gaming motherboards, and that they go up from there, but, for someone who can really use the cores, I still think that's a better deal than buying the so-called gaming CPUs at $700+.
they also have fsb of 1333. question is, what is the difference between active and passive? they have two clovertown quads rated at 2.66, but one is active and the other is passive.
I believe - correct me if I'm wrong, guys - that the passive and active thing is the heatsink assembly. So active gets you a fan, and given that it is intended to fit in a relatively low profile server housing it could be fast and whiney, and passive gets you a larger lump of metal, which the case probably has to push air past, or it overheats. The second won't be a problem with a good case, although I don't know what situation you are in if you decide you want to fit an 'overclockers' heatsink.