Radeon HD 7790 vs Radeon R9 285

Intro

Compare all of that to the Radeon R9 285, which features a GPU core clock speed of 918 MHz, and 2048 MB of GDDR5 RAM set to run at 1375 MHz through a 256-bit bus. It also features 1792 SPUs, 112 TAUs, 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 7790		4330 points
	Difference: 4170 (96%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon R9 285		190 Watts
	Difference: 105 Watts (124%)

Memory Bandwidth

In theory, the Radeon R9 285 should be a lot faster than the Radeon HD 7790 overall. (explain)

Radeon R9 285		176000 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 80000 (83%)

Texel Rate

The Radeon R9 285 should be much (more or less 84%) faster with regards to AF than the Radeon HD 7790. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon HD 7790		56000 Mtexels/sec
	Difference: 46816 (84%)

Pixel Rate

The Radeon R9 285 is a lot (approximately 84%) better at anti-aliasing than the Radeon HD 7790, and also capable of handling higher resolutions while still performing well. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 13376 (84%)

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 maximum amount of information (counted in MB per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that 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 Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.