Radeon HD 7990 vs Radeon RX 470

Intro

Compare those specs to the Radeon RX 470, which comes with a clock frequency of 926 MHz and a GDDR5 memory speed of 1650 MHz. It also makes use of a 256-bit bus, and uses a 14 nm design. It features 2048 SPUs, 128 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 HD 7990		15520 points
Radeon RX 470		11756 points
	Difference: 3764 (32%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon RX 470		26 Mh/s
	Difference: 6 (23%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon RX 470		289 Sol/s
	Difference: 224 (78%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470		120 Watts
Radeon HD 7990		375 Watts
	Difference: 255 Watts (213%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should in theory be quite a bit superior to the Radeon RX 470 overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon RX 470		211200 MB/sec
	Difference: 364800 (173%)

Texel Rate

The Radeon HD 7990 will be a lot (more or less 105%) more effective at AF than the Radeon RX 470. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon RX 470		118528 Mtexels/sec
	Difference: 124672 (105%)

Pixel Rate

The Radeon HD 7990 should be much (about 105%) more effective at AA than the Radeon RX 470, and also will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon RX 470		29632 Mpixels/sec
	Difference: 31168 (105%)

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: Bandwidth is the max amount of information (measured in MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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 maximum fill rate.