Radeon HD 7990 vs Radeon RX 480

Intro

Compare all that to the Radeon RX 480, which has a clock frequency of 1120 MHz and a GDDR5 memory frequency 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 Texture Address Units, and 32 ROPs.

Display Graphs

Hide Graphs

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

As far as performance goes, the Radeon HD 7990 should theoretically be much better than the Radeon RX 480 overall. (explain)

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

Texel Rate

The Radeon HD 7990 is much (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 running with a high screen resolution is important to you, then the Radeon HD 7990 is superior to the Radeon RX 480, 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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units of the card 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.