Radeon HD 7990 vs Radeon RX 480

Intro

Compare those specifications to the Radeon RX 480, which has a clock frequency of 1120 MHz and a GDDR5 memory speed of 2000 MHz. It also makes use of a 256-bit memory bus, and uses a 14 nm design. It is made up of 2304 SPUs, 144 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 RX 480		13349 points
	Difference: 2171 (16%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon RX 480		27 Mh/s
	Difference: 5 (19%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon RX 480		280 Sol/s
	Difference: 233 (83%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 480		150 Watts
Radeon HD 7990		375 Watts
	Difference: 225 Watts (150%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should theoretically be a lot better than the Radeon RX 480 in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon RX 480		262144 MB/sec
	Difference: 313856 (120%)

Texel Rate

The Radeon HD 7990 should be quite a bit (about 51%) more effective at texture filtering than the Radeon RX 480. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon RX 480		161280 Mtexels/sec
	Difference: 81920 (51%)

Pixel Rate

If using a high resolution 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 480		35840 Mpixels/sec
	Difference: 24960 (70%)

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 information (in units of MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics 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 chip could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.