I was planning a pc build with windows 7 64 bit... but i hit a snag while looking at the software that was required. Its 32bit there is no 64bit and never will be.. and it wont work on 64bit. so accepting this fate... and removing the 16gb RAM and replacing with 4gb. will there be a large performance hit from using AutoCAD , photoshop (aside from the ram limit).. the current pc is an old triple core athlon with 4gb.. the replacement which is still made from parts i have is an AMD A8-5600 with 16gb DDR3, 120gb SSD.. personally im thinking its not worth while.. or to just put the SSD in the old PC