GT 545 is roughly the same as GTX 550 ti. Same GF-116 Core only with some SMs and Cache Disabled , and running on a 128 bit bus.... Maybe not the Exact same....... Roughly I would say it can perform similar at resolutions of 1600x900 or less. I would look at some GTX 550 ti Can it run Crysis videos and take away about 5-15% performance, depending on the resolution.