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[pinhodecarlos]

Tim,

There is memory bottleneck issues which means you need to have faster memory and bigger cache. Also you won't take advantage by having HT on the processor so you can rule out i7 and stick with an i5.
Because SOB is running candidates with exponent n=29M, you will see a big degradation in speed when you keep adding instances, this means that you need to understand on your processor if it is better to have one or two or three or four instances running. Example, I have two laptops, one Haswell and one Ivy Bridge, and I only can run on them two instances of prime95 (or LLR) but I am running RPS project with k=5 and n=4.6M. Memory is DDR3 1600 MHz. At this exponent by adding a third instance I can notice memory issues, decrease on overall output.

What people do on Prime95 project (GIMPS) is to only run 2 LL tests (these tests take like 30 days or more, not sure for now) and 2 factoring because it is more efficient to do this on a quad core machine. In guru machines I would run half of the cores with SOB and the other half on dnet...something like that....

At the end if you don't care about the best efficient way to run SOB just run one thread of Prime95 per psychical core. If you care for now the best overall option, for home users that pay electricity, is the core-i5-4690k with DDR3 at 2400Mhz, taking into consideration that fact that it is needed to make a test on how many cores you should run (for SOB, high exponents to test).

Carlos