GeForce GTX 960M vs Radeon HD 4890 2GB

Intro

Compare all of that to the Radeon HD 4890 2GB, which has core clock speeds of 1000 MHz on the GPU, and 975 MHz on the 2048 MB of GDDR5 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 960M		65 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 125 Watts (192%)

Memory Bandwidth

In theory, the Radeon HD 4890 2GB should be 95% faster than the GeForce GTX 960M overall, because of its higher data rate. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce GTX 960M		64000 MB/sec
	Difference: 60800 (95%)

Texel Rate

The GeForce GTX 960M is just a bit (about 10%) more effective at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX 960M		43840 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 3840 (10%)

Pixel Rate

The GeForce GTX 960M will be a small bit (about 10%) more effective at AA than the Radeon HD 4890 2GB, and also able to handle higher screen resolutions better. (explain)

GeForce GTX 960M		17536 Mpixels/sec
Radeon HD 4890 2GB		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 largest amount of information (counted in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics 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 most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate 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 drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.