GeForce GTX 980M vs Radeon HD 6770 1GB

Intro

Compare all of that to the Radeon HD 6770 1GB, which features core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 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 980M		100 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 8 Watts (8%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980M should be quite a bit faster than the Radeon HD 6770 1GB overall. (explain)

GeForce GTX 980M		128000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 60800 (90%)

Texel Rate

The GeForce GTX 980M will be a lot (about 177%) better at texture filtering than the Radeon HD 6770 1GB. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 63648 (177%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 980M is the winner, and very much so. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 52032 (361%)

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 (measured in megabytes per second) that can be moved past 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 type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 that the graphics chip could possibly record to the 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 the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.