Radeon HD 6770 1GB vs Radeon R9 290

Intro

Compare those specs to the Radeon R9 290, which has a core clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 512-bit bus, and uses a 28 nm design. It features 2560 SPUs, 160 Texture Address Units, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Radeon R9 290		300 Watts
	Difference: 192 Watts (178%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 290 should be 376% quicker than the Radeon HD 6770 1GB overall, due to its greater data rate. (explain)

Radeon R9 290		320000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 252800 (376%)

Texel Rate

The Radeon R9 290 should be quite a bit (more or less 256%) better at texture filtering than the Radeon HD 6770 1GB. (explain)

Radeon R9 290		128000 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 92000 (256%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 290 is the winner, and very much so. (explain)

Radeon R9 290		51200 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 36800 (256%)

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 maximum amount of data (counted in MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.