Radeon HD 6770 1GB vs Radeon R9 290

Intro

Compare all of that to the Radeon R9 290, which features a GPU core clock speed of 800 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 512-bit bus. It also 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% faster than the Radeon HD 6770 1GB in general, because of its greater bandwidth. (explain)

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

Texel Rate

The Radeon R9 290 will 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

The Radeon R9 290 should be much (more or less 256%) faster with regards to full screen anti-aliasing than the Radeon HD 6770 1GB, and also should be able to handle higher resolutions more effectively. (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 information (measured in MB per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at 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 chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.