I am still running ons single core and looking at getting a new desktop pc. I have seen a cheap Lenovo Quad core 2.4ghz and also a dual core 3.7ghz which I look the look off. What programs make use of more than one core? and do some only work 2 cores? Is there a list somewhere. I assume the 3.7ghz is still best if there is still many single core software around?