Radeon HD 6790 vs Radeon R9 285

Intro

Compare that to the Radeon R9 285, which comes with a core clock frequency of 918 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is made up of 1792 SPUs, 112 Texture Address Units, and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 285		8500 points
Radeon HD 6790		2150 points
	Difference: 6350 (295%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790		150 Watts
Radeon R9 285		190 Watts
	Difference: 40 Watts (27%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 285 is 31% quicker than the Radeon HD 6790 in general, due to its greater data rate. (explain)

Radeon R9 285		176000 MB/sec
Radeon HD 6790		134400 MB/sec
	Difference: 41600 (31%)

Texel Rate

The Radeon R9 285 will be quite a bit (approximately 206%) better at AF than the Radeon HD 6790. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 69216 (206%)

Pixel Rate

The Radeon R9 285 is quite a bit (about 119%) more effective at anti-aliasing than the Radeon HD 6790, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 15936 (119%)

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 data (measured in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. 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 bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.