GeForce GTX 950M vs Radeon HD 4890 1GB

Intro

Compare all that to the Radeon HD 4890 1GB, which has core speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

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

As far as performance goes, the Radeon HD 4890 1GB should theoretically be much superior to the GeForce GTX 950M in general. (explain)

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

Texel Rate

The Radeon HD 4890 1GB is a small bit (more or less 9%) better at texture 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 is just a bit (approximately 9%) more effective at full screen anti-aliasing than the GeForce GTX 950M, and also will be able to handle 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 maximum amount of data (counted in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, 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 that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.