Radeon HD 6770 1GB vs Radeon R9 390 8G

Intro

Compare all of that to the Radeon R9 390 8G, which features core speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2560 SPUs as well as 160 Texture Address Units and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Radeon R9 390 8G		275 Watts
	Difference: 167 Watts (155%)

Memory Bandwidth

The Radeon R9 390 8G should in theory be much faster than the Radeon HD 6770 1GB overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 316800 (471%)

Texel Rate

The Radeon R9 390 8G should be a lot (about 344%) faster with regards to anisotropic filtering than the Radeon HD 6770 1GB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 124000 (344%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 390 8G is the winner, by a large margin. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 49600 (344%)

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 (measured in MB per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total amount of texture units by the core 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.