GeForce GTX 950M vs Radeon HD 4890 1GB

Intro

Compare all that to the Radeon HD 4890 1GB, which has clock speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 950M		55 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 135 Watts (245%)

Memory Bandwidth

Theoretically, the Radeon HD 4890 1GB should be much faster than the GeForce GTX 950M overall. (explain)

Radeon HD 4890 1GB		124800 MB/sec
GeForce GTX 950M		32000 MB/sec
	Difference: 92800 (290%)

Texel Rate

The Radeon HD 4890 1GB should be just a bit (more or less 9%) better at anisotropic filtering than the GeForce GTX 950M. (explain)

Radeon HD 4890 1GB		40000 Mtexels/sec
GeForce GTX 950M		36560 Mtexels/sec
	Difference: 3440 (9%)

Pixel Rate

The Radeon HD 4890 1GB will be a bit (more or less 9%) faster with regards to AA than the GeForce GTX 950M, and capable of handling higher resolutions while still performing well. (explain)

Radeon HD 4890 1GB		16000 Mpixels/sec
GeForce GTX 950M		14624 Mpixels/sec
	Difference: 1376 (9%)

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 (in units of MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 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 number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock 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 fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.