GeForce GTS 250 1GB vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which features a clock frequency of 1058 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is comprised of 384 SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GTS 250 1GB		145 Watts
	Difference: 81 Watts (127%)

Memory Bandwidth

Performance-wise, the GeForce GTX 650 should theoretically be a small bit better than the GeForce GTS 250 1GB overall. (explain)

GeForce GTX 650		80000 MB/sec
GeForce GTS 250 1GB		70400 MB/sec
	Difference: 9600 (14%)

Texel Rate

The GeForce GTS 250 1GB should be quite a bit (more or less 40%) better at anisotropic filtering than the GeForce GTX 650. (explain)

GeForce GTS 250 1GB		47232 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 13376 (40%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 650 is a better choice, by a large margin. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce GTS 250 1GB		11808 Mpixels/sec
	Difference: 5120 (43%)

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 (in units of MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.