GeForce GTS 250 1GB vs GeForce GTX 650

Intro

Compare that to the GeForce GTX 650, which features GPU clock speed of 1058 MHz, and 1024 MB of GDDR5 RAM set to run at 1250 MHz through a 128-bit bus. It also is comprised of 384 Stream Processors, 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

The GeForce GTX 650 should in theory be a bit faster than the GeForce GTS 250 1GB in general. (explain)

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

Texel Rate

The GeForce GTS 250 1GB will be quite a bit (about 40%) more effective at texture 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 a high screen resolution is important to you, then the GeForce GTX 650 is a better choice, by far. (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 data (counted in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.