Radeon HD 6770 1GB vs Radeon R9 390 8G

Intro

Compare those specifications to the Radeon R9 390 8G, which has core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2560 SPUs along with 160 TAUs 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 390 8G		275 Watts
	Difference: 167 Watts (155%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390 8G should perform a lot faster than the Radeon HD 6770 1GB in general. (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 quite a bit (about 344%) more effective at 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 a better choice, 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: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.