GeForce GTX 860M vs Radeon HD 6770 1GB

Intro

Compare that to the Radeon HD 6770 1GB, which features GPU core speed of 900 MHz, and 1024 MB of GDDR5 memory set to run at 1050 MHz through a 128-bit bus. It also is made up of 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 860M		45 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 63 Watts (140%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 1GB is 5% faster than the GeForce GTX 860M overall, because of its greater bandwidth. (explain)

Radeon HD 6770 1GB		67200 MB/sec
GeForce GTX 860M		64000 MB/sec
	Difference: 3200 (5%)

Texel Rate

The GeForce GTX 860M is quite a bit (about 113%) better at texture filtering than the Radeon HD 6770 1GB. (explain)

GeForce GTX 860M		76512 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 40512 (113%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6770 1GB is superior to the GeForce GTX 860M, though only just barely. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
GeForce GTX 860M		12752 Mpixels/sec
	Difference: 1648 (13%)

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 max amount of data (measured in MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, 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 is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video 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 maximum number of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.