Hi all. I have an entry level Alienware X51 with the following: CPU_Name: Intel(R) Core(TM) i3-2120 CPU @ 3.30GHz Card name: NVIDIA GeForce GT 545 (1GB DDR5) Manufacturer: NVIDIA Chip type: GeForce GT 545 DAC type: Integrated RAMDAC Display Memory: 2717 MB Dedicated Memory: 978 MB Shared Memory: 1739 MB 4GB ram What upgrade would give me better performance? (sim racing obviously) Upgrading to an i5? Upgrading to a GT 660 or 660ti Or increasing the ram to 8GB? I'm guessing the 660ti but I find it all a bit confusing? Thanks for any advise.