Radeon HD 6990 vs Radeon RX 470 4GB

Intro

Compare that to the Radeon RX 470 4GB, which comes with GPU clock speed of 926 MHz, and 4096 MB of GDDR5 memory set to run at 1650 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 TAUs, and 32 ROPs.

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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.

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Radeon RX 470 4GB		27 Mh/s
Radeon HD 6990		24 Mh/s
	Difference: 3 (13%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470 4GB		120 Watts
Radeon HD 6990		375 Watts
	Difference: 255 Watts (213%)

Memory Bandwidth

Performance-wise, the Radeon HD 6990 should in theory be much better than the Radeon RX 470 4GB overall. (explain)

Radeon HD 6990		320000 MB/sec
Radeon RX 470 4GB		211200 MB/sec
	Difference: 108800 (52%)

Texel Rate

The Radeon HD 6990 should be a lot (more or less 34%) more effective at texture filtering than the Radeon RX 470 4GB. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon RX 470 4GB		118528 Mtexels/sec
	Difference: 40832 (34%)

Pixel Rate

The Radeon HD 6990 is a lot (about 79%) more effective at full screen anti-aliasing than the Radeon RX 470 4GB, and also able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon RX 470 4GB		29632 Mpixels/sec
	Difference: 23488 (79%)

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 data (counted in megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.