GeForce GT 640 DDR3 vs Radeon R7 370 4G

Intro

Compare all that to the Radeon R7 370 4G, which comes with a clock frequency of 975 MHz and a GDDR5 memory speed of 1400 MHz. It also uses a 256-bit bus, and makes use of a 28 nm design. It features 1024 SPUs, 64 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon R7 370 4G		110 Watts
	Difference: 45 Watts (69%)

Memory Bandwidth

The Radeon R7 370 4G, in theory, should perform much faster than the GeForce GT 640 DDR3 in general. (explain)

Radeon R7 370 4G		179200 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 122176 (214%)

Texel Rate

The Radeon R7 370 4G is quite a bit (about 117%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon R7 370 4G		62400 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 33600 (117%)

Pixel Rate

The Radeon R7 370 4G is quite a bit (more or less 117%) more effective at full screen anti-aliasing than the GeForce GT 640 DDR3, and also should be able to handle higher resolutions without slowing down too much. (explain)

Radeon R7 370 4G		31200 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 16800 (117%)

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 maximum amount of data (counted in megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units of the card by the core 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.