I built a PC for a friend of mine recently. His old pc, i5 processor and 4 Gb's of DDR2 ram were not up to the job for what he wanted to do. He is a musician and writes a lot of music and video on Nuendo so I ordered some new components. He already had the case with two 120mm fans, one in the front and one in the back. He could have done with a couple of new hard drives but due to a shortage of cash we used the exisitng ones. I donated a spare, decent gfx card I had kicking around for the job as well. We opted for buying an 8 core processor and 8 Gb's of DDR3 ram. It is running really well now, and fast too. When he saves up some more money I will upgrade the heatsink on the CPU and install a solid state drive for the OS and software and place all his data on a normal mechanical hard drive. Oh and I installed a core tuner software so that he can assign certain vsti's in nuendo to certain cores to get the most out of it. I reckon it would run a project with 16 tracks using 16 separate Spectrasonics Omnisphere synths assigned to each track