GeForce GTX 980 vs Radeon HD 6770 1GB

Intro

Compare all of that to the Radeon HD 6770 1GB, which has a clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It features 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
GeForce GTX 980		165 Watts
	Difference: 57 Watts (53%)

Memory Bandwidth

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

GeForce GTX 980		224000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 156800 (233%)

Texel Rate

The GeForce GTX 980 will be quite a bit (more or less 300%) faster with regards to texture filtering than the Radeon HD 6770 1GB. (explain)

GeForce GTX 980		144128 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 108128 (300%)

Pixel Rate

The GeForce GTX 980 will be a lot (more or less 400%) more effective at anti-aliasing than the Radeon HD 6770 1GB, and also capable of handling higher resolutions more effectively. (explain)

GeForce GTX 980		72064 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 57664 (400%)

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 (in units of MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.