Radeon HD 6990 vs Radeon RX 550

Intro

Compare those specs to the Radeon RX 550, which has GPU clock speed of 1100 MHz, and 2048 MB of GDDR5 memory set to run at 1750 MHz through a 128-bit bus. It also is comprised of 512 Stream Processors, 32 Texture Address Units, and 16 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 6990		5820 points
Radeon RX 550		3507 points
	Difference: 2313 (66%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 550		50 Watts
Radeon HD 6990		375 Watts
	Difference: 325 Watts (650%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6990 should theoretically be a lot superior to the Radeon RX 550 overall. (explain)

Radeon HD 6990		320000 MB/sec
Radeon RX 550		114688 MB/sec
	Difference: 205312 (179%)

Texel Rate

The Radeon HD 6990 is much (more or less 353%) more effective at anisotropic filtering than the Radeon RX 550. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon RX 550		35200 Mtexels/sec
	Difference: 124160 (353%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6990 is superior to the Radeon RX 550, by far. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon RX 550		17600 Mpixels/sec
	Difference: 35520 (202%)

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 max amount of data (measured in megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the 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 number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.