Radeon HD 6770 1GB vs Radeon R9 285

Intro

Compare those specs to the Radeon R9 285, which has core clock speeds of 918 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 RAM. It features 1792 SPUs along with 112 Texture Address Units and 32 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 285		190 Watts
	Difference: 82 Watts (76%)

Memory Bandwidth

The Radeon R9 285, in theory, should perform much faster than the Radeon HD 6770 1GB overall. (explain)

Radeon R9 285		176000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 108800 (162%)

Texel Rate

The Radeon R9 285 should be quite a bit (more or less 186%) faster with regards to anisotropic filtering than the Radeon HD 6770 1GB. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 66816 (186%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 285 is a better choice, and very much so. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 14976 (104%)

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 maximum amount of data (measured in megabytes per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 are applied in one second. This is calculated by multiplying the total texture units of the card 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 one second.

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