I'm thinking of building a pc that will crunch numbers to generate predictive algorithms. My current processor is a quad-core Intel i5 4770K w/ 16 MB memory. When running the statistical program the processor and memory is operating at around 85% capacity. This slows down other programs. Studies can run for 48+ hours with the current system. Rather than trying to add memory to the existing box, I'd like to upgrade to a new system with an 8-core processor with more memory... Suggestions for selecting a processor for this job? A simple GPU to drive basic screens will be sufficient so on-board graphics should be OK.