GeForce GTX 960M vs Radeon HD 4890 1GB

Intro

Compare those specs to the Radeon HD 4890 1GB, which features core 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 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 960M		65 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 125 Watts (192%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 1GB should theoretically be quite a bit better than the GeForce GTX 960M overall. (explain)

Radeon HD 4890 1GB		124800 MB/sec
GeForce GTX 960M		64000 MB/sec
	Difference: 60800 (95%)

Texel Rate

The GeForce GTX 960M is a bit (more or less 10%) faster with regards to anisotropic filtering than the Radeon HD 4890 1GB. (explain)

GeForce GTX 960M		43840 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 3840 (10%)

Pixel Rate

The GeForce GTX 960M will be a bit (approximately 10%) more effective at full screen anti-aliasing than the Radeon HD 4890 1GB, and capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 960M		17536 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 1536 (10%)

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 maximum amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. 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 many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.