GeForce 940M vs Radeon HD 4890 2GB

Intro

Compare all of that to the Radeon HD 4890 2GB, which has a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 RAM running at 975 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4890 2GB should in theory perform a lot faster than the GeForce 940M overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce 940M		16000 MB/sec
	Difference: 108800 (680%)

Texel Rate

The Radeon HD 4890 2GB should be quite a bit (about 55%) better at anisotropic filtering than the GeForce 940M. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
GeForce 940M		25728 Mtexels/sec
	Difference: 14272 (55%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4890 2GB is the winner, and very much so. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
GeForce 940M		8576 Mpixels/sec
	Difference: 7424 (87%)

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 information (measured in MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be 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 better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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