Call of Juarez
The Nvidia GeForce 8800 GTS 512MB is somewhat faster than the ECS N8800GT-512MX DT, yet this has no practical value since the average frame rate is about 20-22fps. Neither card can provide a comfortable speed if you select the highest graphics quality settings and enable 4x FSAA.
Call of Duty 4: Modern Warfare
The Nvidia GeForce 8800 GTS 512MB ensures a bigger reserve of speed at resolutions above 1280x1024 than the ECS card, but the difference is rather small. Theoretically, both cards can be used to play at 1920x1200, yet the most comfortable mode is 1280x1024.