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Radeon HD 6990 vs Radeon R9 380 2G

Intro

The Radeon HD 6990 comes with a clock frequency of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It is comprised of 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

Compare all of that to the Radeon R9 380 2G, which features a clock speed of 970 MHz and a GDDR5 memory frequency of 1425 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It features 1792 SPUs, 112 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.

3DMark Fire Strike Graphics Score

Radeon R9 380 2G 8850 points
Radeon HD 6990 5820 points
Difference: 3030 (52%)

Ethereum Mining Hash Rate

Radeon HD 6990 24 Mh/s
Radeon R9 380 2G 19 Mh/s
Difference: 5 (26%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380 2G 190 Watts
Radeon HD 6990 375 Watts
Difference: 185 Watts (97%)

Memory Bandwidth

In theory, the Radeon HD 6990 is 75% quicker than the Radeon R9 380 2G overall, because of its higher bandwidth. (explain)

Radeon HD 6990 320000 MB/sec
Radeon R9 380 2G 182400 MB/sec
Difference: 137600 (75%)

Texel Rate

The Radeon HD 6990 should be much (about 47%) better at anisotropic filtering than the Radeon R9 380 2G. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon R9 380 2G 108640 Mtexels/sec
Difference: 50720 (47%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6990 is a better choice, and very much so. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon R9 380 2G 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

Check prices at:

Radeon R9 380 2G

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 380 2G
Manufacturer AMD AMD
Year March 2011 June 2015
Code Name Antilles Antigua PRO
Memory 2048 MB (x2) 2048 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 108640 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 31040 Mpixels/sec
Unified Shaders 1536 (x2) 1792
Texture Mapping Units 96 (x2) 112
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 ×16
DirectX Version DirectX 11 DirectX 12.0
OpenGL Version OpenGL 4.1 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 6990

Amazon.com

Check prices at:

Radeon R9 380 2G

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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