Hi i bought one of these recenty without really knowing what i bought.It is 2.0 dual core with 2gb of ram and 2 160gb hd.I thought the case was nice and could have been repurposed if it was not going to work. I have been reading with interest what upgrades is possible. The cpu,s X5365 some ram 32gb and a pcie ssd seems reasonable. I would also like to use el capitan or sierra if possible. I am going to use it for audio production sync it with my windows box offload Kontakt on to it thru networking. I think for an old machine it is still very viable 24ghz and 32gb ram is not to be sneezed at especially for the money you are paying for the parts. I recently built a Core X9650 system for someone man was it fast it only had 4 gb and a spinner. I have a core 3.5 i5K with 12 gb W7 box. Not sure how the 2 would compare bets it's not too far away. I think the best idea would be to get El Capitan working on the original hardware before splashing out on cpus and ram. Is there any good guides for this