The hardware you'll need to meet the Call of Duty Modern Warfare 2 recommended system requirements isn't that much higher. Crafting a team of 12GB of RAM and a processor as powerful as the Intel Core i7 4770 or AMD Ryzen 5 1400 will help maintain higher minimum and maximum frame rates.
On PC, you can buy Call of Duty: Modern Warfare II on Steam forR$69.99, starting October 28. This is the first time in years that the franchise has appeared in Valve's store, as recent games could only be purchased through Activision Blizzard's Battle marketplace.