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Going from Dell Inspiron 530 with i5 and 4GB RAM to DellT410 server with 24 GB RAM and Xeon 3570 processor, I got little, if at all speed advantage.

I don't know how many times we mentioned this. If you are looking for a speed boost, RAM isn't the answer. Most computers come with 4-8GB today and that is more than enough. While SBS 2011 will actually use all of that. There will be little if any difference between 16GB and 24GB of RAM.

The i5-2500k is faster or at least equal to the Xeon 3570 (which I'm guessing you paid close to a $1000 for). I'm not surprised that you didn't see a performance boost. How much did the server cost? The Xeon E3-1230/i7-2600 is a fourth of the cost and will run circles around that.

If you really want a speed boost, you should get SSDs and/or many drives in a RAID Array.