Radeon HD 7990 vs Radeon R9 285

Intro

Compare all that to the Radeon R9 285, which has clock speeds of 918 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 memory. It features 1792 SPUs as well as 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 HD 7990		15520 points
Radeon R9 285		8500 points
	Difference: 7020 (83%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 285		18 Mh/s
	Difference: 14 (78%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 285		190 Watts
Radeon HD 7990		375 Watts
	Difference: 185 Watts (97%)

Memory Bandwidth

In theory, the Radeon HD 7990 is 227% quicker than the Radeon R9 285 overall, due to its higher data rate. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 285		176000 MB/sec
	Difference: 400000 (227%)

Texel Rate

The Radeon HD 7990 should be quite a bit (approximately 137%) faster with regards to anisotropic filtering than the Radeon R9 285. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 285		102816 Mtexels/sec
	Difference: 140384 (137%)

Pixel Rate

The Radeon HD 7990 will be quite a bit (more or less 107%) more effective at full screen anti-aliasing than the Radeon R9 285, and able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R9 285		29376 Mpixels/sec
	Difference: 31424 (107%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. 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 amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

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