Here are the minimum specs for far cry 2. CPU: Pentium 4 3.2 Ghz, Pentium D 2.66 Ghz, AMD Athlon 64 3500+ or better
RAM: 1 GB
Video card: NVidia 6800 or ATI X1650 or better; shader Model 3 required; 256 Mb of graphic memory
Media reader: DVD-ROM
Hard drive space: ~12 Gig or HD space. (tbd)
These are the recommended specs CPU: Intel Core 2 Duo Family, AMD 64 X2 5200+, AMD Phenom or better
RAM: 2 GB
Video card: NVidia 8600 GTS or better, ATI X1900 or better; 512 Mb of graphic memory
Sound: 5.1 sound card recommended.
I think that you would be able to play Far Cry quite easily.
Your GPU (8400GS) is below the minimum specs of Far Cry 2 (NVidia 6800). Even the 8500GT is one tier below the 6800.
Try to run it on minimum settings and minimum resolution, maybe it will run then. Be patient for the 4850.
Those listed specs usually should be met by a great deal - meeting those requirements doesn't make it playable for high action intensive gaming scenarios but it's playable, just expect alot of lag with the current setup. With your new graphics card it'll be good, but you'll need more RAM, too. Use the specs as a guideline to help you understand where you need to be as far as your setup and use the game's preferences to find a mediocre resolution without losing too much eyecandy.
Take into mind that keeping your hard drive clean (defragging, keeping 2/3 of the HDD free, closing unncessary programs) significantly increase ingame performance. Hope this helps.
I don't know if it's a good game or not, but I can tell you this:
Minimum System Requirements:
■1GB System RAM (XP) / 2GB System RAM (Vista)
■2.4 Ghz Intel Pentium 4 or equivalent processor
■Direct X 9.0c compliant videocard with 256MB RAM (NVIDIA 6800 or better / ATI X850 or better)
Recommended System Requirements:
■Intel Core 2 Duo processor
■2 GB System RAM
■Direct X 9.0c compliant video card with 512MB RAM (NVIDIA 8800 series, ATI 3800 series)
■Supported Video Card Chipsets:
■NVIDIA GeForce 200 series
■NVIDIA GeForce 9800 series
■NVIDIA GeForce 9600 series
■NVIDIA GeForce 8800 series
■NVIDIA GeForce 8600 series
■NVIDIA GeForce 8500 series
■NVIDIA GeForce 8400 series
■NVIDIA GeForce 7900 series
■NVIDIA GeForce 7800 series
■NVIDIA GeForce 7600 series
■NVIDIA GeForce 7300 series
■NVIDIA GeForce 6800 series
■ATI HD 4800 series
■ATI HD 4600 series
■ATI HD 3800 series
■ATI HD 3600 series
■ATI HD 3400 series
■ATI HD 2900 series
■ATI HD 2600 series
■ATI HD 2400 series
■ATI X1900 series
■ATI X1800 series
■ATI X1600 series
■ATI X1300 series
■ATI X850 series