144 or for single CPU, 244 is for Dual CPU and 844 is for Quad CPU - from what I have seen this is the case. I'm not sure if there are any cache size differences, but I think they are all the same speed. The 844 will be much pricier as its for a Quad setup.
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Originally posted by porcupine If you're using it in a single processor system, they should all be the same. Unless you plan to upgrade in the future to a dual processor setup using the original processor, you'll want the 144.
Pricing for the 14x and 24x are nearly in line with each other. In wich case I'd recomend the 24x since you always have a clear upgrade path to a dual proc box where as with the 14x you're locked into single proc solutions.