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Radeon HD 6990 vs Radeon R9 380X

Intro

The Radeon HD 6990 has a GPU clock speed of 830 MHz, and the 2048 MB of GDDR5 memory is set to run at 1250 MHz through a 256-bit bus. It also features 1536 Stream Processors, 96 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon R9 380X, which has a clock frequency of 970 MHz and a GDDR5 memory speed of 1425 MHz. It also makes use of a 256-bit bus, and uses a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, 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.

3DMark Fire Strike Graphics Score

Radeon R9 380X 9519 points
Radeon HD 6990 5820 points
Difference: 3699 (64%)

Ethereum Mining Hash Rate

Radeon HD 6990 24 Mh/s
Radeon R9 380X 19 Mh/s
Difference: 5 (26%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380X 190 Watts
Radeon HD 6990 375 Watts
Difference: 185 Watts (97%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6990 should theoretically be much better than the Radeon R9 380X in general. (explain)

Radeon HD 6990 320000 MB/sec
Radeon R9 380X 182400 MB/sec
Difference: 137600 (75%)

Texel Rate

The Radeon HD 6990 should be a lot (approximately 28%) better at texture filtering than the Radeon R9 380X. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon R9 380X 124160 Mtexels/sec
Difference: 35200 (28%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6990 is superior to the Radeon R9 380X, by a large margin. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon R9 380X 31040 Mpixels/sec
Difference: 22080 (71%)

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

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Radeon HD 6990

Amazon.com

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Radeon R9 380X

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 6990 Radeon R9 380X
Manufacturer AMD AMD
Year March 2011 November 2015
Code Name Antilles Tonga XT
Memory 2048 MB (x2) 4096 MB
Core Speed 830 MHz (x2) 970 MHz
Memory Speed 5000 MHz (x2) 5700 MHz
Power (Max TDP) 375 watts 190 watts
Bandwidth 320000 MB/sec 182400 MB/sec
Texel Rate 159360 Mtexels/sec 124160 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 31040 Mpixels/sec
Unified Shaders 1536 (x2) 2048
Texture Mapping Units 96 (x2) 128
Render Output Units 32 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 5000 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 12.0
OpenGL Version OpenGL 4.1 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video 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 card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 6990

Amazon.com

Check prices at:

Radeon R9 380X

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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