GeForce GT 240 GDDR5 1GB vs GeForce GTX 285 2GB

Intro

Compare those specifications to the GeForce GTX 285 2GB, which uses a 55 nm design. nVidia has set the core speed at 648 MHz. The GDDR3 memory works at a frequency of 1242 MHz on this particular card. It features 240 SPUs as well as 80 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5 1GB		70 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 134 Watts (191%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 285 2GB should in theory be much better than the GeForce GT 240 GDDR5 1GB in general. (explain)

GeForce GTX 285 2GB		158976 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 104576 (192%)

Texel Rate

The GeForce GTX 285 2GB will be much (more or less 195%) better at AF than the GeForce GT 240 GDDR5 1GB. (explain)

GeForce GTX 285 2GB		51840 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 34240 (195%)

Pixel Rate

The GeForce GTX 285 2GB will be a lot (approximately 371%) faster with regards to full screen anti-aliasing than the GeForce GT 240 GDDR5 1GB, and also should be capable of handling higher resolutions more effectively. (explain)

GeForce GTX 285 2GB		20736 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 16336 (371%)

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 maximum amount of data (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total number of 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 most pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called 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 of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.