Radeon HD 7990 vs Radeon RX 470

Intro

Compare those specifications to the Radeon RX 470, which makes use of a 14 nm design. AMD has clocked the core speed at 926 MHz. The GDDR5 RAM runs at a frequency of 1650 MHz on this card. It features 2048 SPUs along with 128 TAUs 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 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 theoretically be much 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 should be much (more or less 105%) better at texture filtering than the Radeon RX 470. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7990 is the winner, by a large margin. (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: Memory bandwidth is the max amount of data (in units of MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR memory, 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 AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.