GeForce GT 240 GDDR5 vs GeForce GTX 580

Intro

Compare that to the GeForce GTX 580, which features clock speeds of 772 MHz on the GPU, and 1002 MHz on the 1536 MB of GDDR5 memory. It features 512 SPUs along with 64 TAUs and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5		70 Watts
GeForce GTX 580		244 Watts
	Difference: 174 Watts (249%)

Memory Bandwidth

Theoretically, the GeForce GTX 580 should be much faster than the GeForce GT 240 GDDR5 overall. (explain)

GeForce GTX 580		192384 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 137984 (254%)

Texel Rate

The GeForce GTX 580 will be a lot (more or less 181%) more effective at anisotropic filtering than the GeForce GT 240 GDDR5. (explain)

GeForce GTX 580		49408 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 31808 (181%)

Pixel Rate

The GeForce GTX 580 will be quite a bit (approximately 742%) better at AA than the GeForce GT 240 GDDR5, and capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 580		37056 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 32656 (742%)

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 megabytes per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number 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 speed of the chip. The higher the texel rate, the better the graphics 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 maximum number of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.