Radeon HD 6770 1GB vs Radeon R9 390 8G

Intro

Compare all that to the Radeon R9 390 8G, which makes use of a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM works at a speed of 1500 MHz on this specific model. It features 2560 SPUs as well as 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 390 8G		275 Watts
	Difference: 167 Watts (155%)

Memory Bandwidth

Performance-wise, the Radeon R9 390 8G should in theory be quite a bit superior to 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 will be much (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

The Radeon R9 390 8G should be a lot (about 344%) more effective at AA than the Radeon HD 6770 1GB, and capable of handling higher screen resolutions better. (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 largest amount of data (counted in MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied 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 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 amount of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.