Radeon HD 6990 vs Radeon RX 480

Intro

Compare all that to the Radeon RX 480, which has GPU clock speed of 1120 MHz, and 8192 MB of GDDR5 memory running at 2000 MHz through a 256-bit bus. It also is made up of 2304 SPUs, 144 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 RX 480		13349 points
Radeon HD 6990		5820 points
	Difference: 7529 (129%)

Ethereum Mining Hash Rate

Radeon RX 480		27 Mh/s
Radeon HD 6990		24 Mh/s
	Difference: 3 (13%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 480		150 Watts
Radeon HD 6990		375 Watts
	Difference: 225 Watts (150%)

Memory Bandwidth

The Radeon HD 6990 should in theory perform much faster than the Radeon RX 480 in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon RX 480		262144 MB/sec
	Difference: 57856 (22%)

Texel Rate

The Radeon RX 480 should be a small bit (approximately 1%) better at AF than the Radeon HD 6990. (explain)

Radeon RX 480		161280 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 1920 (1%)

Pixel Rate

The Radeon HD 6990 should be much (more or less 48%) faster with regards to AA than the Radeon RX 480, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon RX 480		35840 Mpixels/sec
	Difference: 17280 (48%)

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 largest amount of information (counted in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better 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 maximum amount of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.