GeForce GT 640 DDR3 vs Radeon R9 M375

Intro

Compare those specs to the Radeon R9 M375, which features a core clock speed of 1015 MHz and a DDR3 memory speed of 1100 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GT 640 DDR3 is 62% quicker than the Radeon R9 M375 in general, due to its greater bandwidth. (explain)

GeForce GT 640 DDR3		57024 MB/sec
Radeon R9 M375		35200 MB/sec
	Difference: 21824 (62%)

Texel Rate

The Radeon R9 M375 is quite a bit (more or less 41%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon R9 M375		40600 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 11800 (41%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 M375 is the winner, though not by far. (explain)

Radeon R9 M375		16240 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 1840 (13%)

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 max amount of information (measured in megabytes per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card 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 in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can 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 Render Output Units by the clock speed of the card. 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 rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.