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.
It's a highly optimized game that can run on a wide range of hardware, but you'll still need to tweak some graphics settings if you want a competitive frame rate.