You need a high-end gaming system from the day of the release.
What does that mean?
A computer with a high-end cpu and gpu and plenty of memory.
CPU: Intel Core i7 Extreme Edition
http://www.intel.com/products/processor/corei7EE/index.htm
GPU:
AMD ATi Radeon HD 6870
http://www.amd.com/us/products/desktop/graphics/amd-radeon-hd-6000/hd-6870/Pages/amd-radeon-hd-6870-overview.aspx#1
Nvidia GeForce GTX480
http://www.nvidia.com/object/product_geforce_gtx_480_us.html
In case you didnt know, the Radeon 6870 beats out an overclocked GeForce GTX460 by about 1 - 2 fps and still doesnt win in the tesselation department.
Please do your research, because the Radeon 6870 is nowhere even close to comparable to a GeForce GTX480.