GeForce GT 240 GDDR5 1GB vs GeForce GTX 650

Intro

Compare those specs to the GeForce GTX 650, which comes with a GPU core clock speed of 1058 MHz, and 1024 MB of GDDR5 memory set to run at 1250 MHz through a 128-bit bus. It also features 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GT 240 GDDR5 1GB		70 Watts
	Difference: 6 Watts (9%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 650 should be 47% faster than the GeForce GT 240 GDDR5 1GB in general, due to its greater bandwidth. (explain)

GeForce GTX 650		80000 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 25600 (47%)

Texel Rate

The GeForce GTX 650 should be quite a bit (about 92%) better at texture filtering than the GeForce GT 240 GDDR5 1GB. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 16256 (92%)

Pixel Rate

The GeForce GTX 650 will be a lot (about 285%) better at FSAA than the GeForce GT 240 GDDR5 1GB, and capable of handling higher resolutions more effectively. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce GT 240 GDDR5 1GB		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 over the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.