GeForce GTS 250 512MB vs GeForce GTX 650 Ti 2GB

Intro

Compare that to the GeForce GTX 650 Ti 2GB, which features GPU core speed of 928 MHz, and 2048 MB of GDDR5 RAM set to run at 1350 MHz through a 128-bit bus. It also is made up of 768 SPUs, 64 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti 2GB		110 Watts
GeForce GTS 250 512MB		145 Watts
	Difference: 35 Watts (32%)

Memory Bandwidth

In theory, the GeForce GTX 650 Ti 2GB should perform much faster than the GeForce GTS 250 512MB overall. (explain)

GeForce GTX 650 Ti 2GB		86400 MB/sec
GeForce GTS 250 512MB		70400 MB/sec
	Difference: 16000 (23%)

Texel Rate

The GeForce GTX 650 Ti 2GB is a lot (about 26%) more effective at texture filtering than the GeForce GTS 250 512MB. (explain)

GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
GeForce GTS 250 512MB		47232 Mtexels/sec
	Difference: 12160 (26%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 650 Ti 2GB is the winner, by far. (explain)

GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
GeForce GTS 250 512MB		11808 Mpixels/sec
	Difference: 3040 (26%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.