GeForce GT 640 DDR3 vs Radeon R9 M375

Intro

Compare all of that to the Radeon R9 M375, which features GPU core speed of 1015 MHz, and 4096 MB of DDR3 memory running at 1100 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GT 640 DDR3 should in theory perform much faster than the Radeon R9 M375 overall. (explain)

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

Texel Rate

The Radeon R9 M375 will be a lot (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

The Radeon R9 M375 is a bit (more or less 13%) faster with regards to AA than the GeForce GT 640 DDR3, and also should be capable of handling higher resolutions without losing too much performance. (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: Bandwidth is the max amount of data (in units of megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units 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 rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.