Ram is just a Intermediary holder of data, Lies between HDD and CPU. HHD are very slow when retrieving data, in-fact Ram is about 10 times faster than even a SSD – But also by far more expensive than a HDD and not as practical as an SSD. Programs and program date are transferred to Ram so that the CPU can use/modify. The cpu is NOT what limits the amount of ram, it is the operating system and the MB bios.
Limitations imposed by windows 7:
Version........................Limit on X86.........Limit on X64
Windows 7 Ultimate ........ 4 GB .................. 192 GB
Windows 7 Enterprise........ 4 GB .................. 192 GB
Windows 7 Professiona .... 4 GB .................. 192 GB
Windows 7 Home Premium 4 GB .................... 16 GB
Windows 7 Home Basic ..... 4 GB ..................... 8 GB
Would LOVE to have 192 Gigs, My I5-2500k would Love it, But the largest ram Modules I think are 8 gig, so 192 gig would require 24 memory slots – LOL as most typical MB have 4 or 6 slots. Also cost would be over $1200.
Also for me the ONLY thing I could do with it is make one HUGH ramdrive.
BACK to earth – 4 Gigs generally considered Min any more, sweetspot is 8 gigs, Myslef have 16 gigs on my I5-2500k
REF PSU - You do NOT want your investment to go up in smoke, so listen to JSC.
Your system will draw less than 350 Watts, so a HIGH quality 450+ is recommended. If you THINK you might want to stick a 2nd 6850 inthere for xfire a 650 Watt Corsait TX would be a good choice.
Many buy the "LARGE PSUs" that are poor quality and live to regreat it.