GeForce GTX 980M vs Radeon HD 4890 2GB

Intro

Compare those specifications to the Radeon HD 4890 2GB, which makes use of a 55 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 memory is set to run at a frequency of 975 MHz on this specific model. 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 980M		100 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 90 Watts (90%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980M should be 3% quicker than the Radeon HD 4890 2GB overall, due to its greater data rate. (explain)

GeForce GTX 980M		128000 MB/sec
Radeon HD 4890 2GB		124800 MB/sec
	Difference: 3200 (3%)

Texel Rate

The GeForce GTX 980M will be quite a bit (about 149%) better at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 59648 (149%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 980M is superior to the Radeon HD 4890 2GB, by a large margin. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 50432 (315%)

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 (counted in megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total amount of texture units 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 in one second.

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