Radeon HD 6790 vs Radeon R9 285

Intro

Compare all that to the Radeon R9 285, which makes use of a 28 nm design. AMD has set the core speed at 918 MHz. The GDDR5 RAM is set to run at a speed of 1375 MHz on this particular model. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

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% faster than the Radeon HD 6790 overall, due to its higher bandwidth. (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%) faster with regards to 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 (approximately 119%) faster with regards to FSAA than the Radeon HD 6790, and also will be capable of handling higher screen resolutions more effectively. (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: Bandwidth is the max amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.