GeForce GT 240 GDDR5 vs GeForce GTX 650

Intro

Compare those specs 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 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GT 240 GDDR5		70 Watts
	Difference: 6 Watts (9%)

Memory Bandwidth

The GeForce GTX 650, in theory, should be quite a bit faster than the GeForce GT 240 GDDR5 in general. (explain)

GeForce GTX 650		80000 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 25600 (47%)

Texel Rate

The GeForce GTX 650 is a lot (about 92%) more effective at anisotropic filtering than the GeForce GT 240 GDDR5. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 16256 (92%)

Pixel Rate

The GeForce GTX 650 is a lot (more or less 285%) better at AA than the GeForce GT 240 GDDR5, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 12528 (285%)

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: Bandwidth is the max amount of data (measured in MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video 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 most pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.