GeForce GT 240 GDDR5 1GB vs Radeon R9 285

Intro

Compare those specifications to the Radeon R9 285, which has GPU core speed of 918 MHz, and 2048 MB of GDDR5 memory running at 1375 MHz through a 256-bit bus. It also is comprised of 1792 SPUs, 112 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5 1GB		70 Watts
Radeon R9 285		190 Watts
	Difference: 120 Watts (171%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 285 should be 224% quicker than the GeForce GT 240 GDDR5 1GB in general, because of its greater bandwidth. (explain)

Radeon R9 285		176000 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 121600 (224%)

Texel Rate

The Radeon R9 285 should be a lot (more or less 484%) better at AF than the GeForce GT 240 GDDR5 1GB. (explain)

Radeon R9 285		102816 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 85216 (484%)

Pixel Rate

The Radeon R9 285 is quite a bit (more or less 568%) faster with regards to AA than the GeForce GT 240 GDDR5 1GB, and able to handle higher resolutions without slowing down too much. (explain)

Radeon R9 285		29376 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 24976 (568%)

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 largest amount of data (measured in megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the bus 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 higher the bandwidth is, the faster 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 in one second. This number is calculated by multiplying the total texture units of the card 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 - the lower the bandwidth is, the lower the potential to reach the max fill rate.