Radeon HD 5770 vs Radeon R9 285

Intro

Compare those specifications to the Radeon R9 285, which features GPU core speed of 918 MHz, and 2048 MB of GDDR5 memory running at 1375 MHz through a 256-bit bus. It also is made up of 1792 Stream Processors, 112 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
Radeon R9 285		190 Watts
	Difference: 82 Watts (76%)

Memory Bandwidth

The Radeon R9 285 should in theory perform much faster than the Radeon HD 5770 overall. (explain)

Radeon R9 285		176000 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 99200 (129%)

Texel Rate

The Radeon R9 285 will be much (about 202%) better at AF than the Radeon HD 5770. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 68816 (202%)

Pixel Rate

The Radeon R9 285 is a lot (about 116%) more effective at anti-aliasing than the Radeon HD 5770, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 15776 (116%)

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 largest amount of information (measured in MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory 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 better 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 texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate 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 filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.