these cpu benches are specious. the 2600k best the 2600 by 12% when they have identical cpu specs and differ only through the inbedded graphics. i7 2600k 50% better than an i7 950 ?? no way!! http://www.anandtech.com/bench/Product/287?vs=100 does passmark work for intel? maybe, passmark performance test and burn-in test ships with intel motherboards.
Yes, it's a comparative donkey..... still, probably OK for most trading. When people ask, I suggest nothing slower than the W3530 CPU. Sometimes going "too cheap" just isn't a good idea. Where paying $519 for that T3500 might make sense would be where you had your hands on a much faster [compatible, of course] CPU.... at the right price... you could swap out. As a rule of thumb, I consider the proper cost of a workstation machine to be about $600 + CPU + RAM (when RAM was more costly).... and of course some of Dell's deals are MUCH better than that.