Processor: Intel i7-860 processor (8 MB Cache, 2.8 GHz)
Memory: 12 GB Dual Channel DDR3 SDRAm @ 1333MHz- 4 DIMMs
Video Card: ATI Radeon HD 5670 1 GB
Hard Drive: 1.5TB - 7200 RPM, SATA 3.0 GB/s, 16MB Cache
...along with other features like Microsoft Office, Windows 7 Premium, Adobe, Monitor/Speakers/Keyboard/Mouse.
The specs I listed is kindly what I am curious about as I'm not a big tech guy. The total price is $2000 which I find expensive but I have a SLOW computer and I want optimal speed. What are the differences in hard drive (1 TB, 1.5 TB) and the memory (6 GBs, 8 GBs, 12 GBs) and how the computer runs?

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