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Radeon HD 6990 vs Radeon R9 390X 8G

Intro

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

Compare that to the Radeon R9 390X 8G, which comes with a GPU core clock speed of 1050 MHz, and 8192 MB of GDDR5 RAM set to run at 1500 MHz through a 512-bit bus. It also is comprised of 2816 SPUs, 176 Texture Address Units, and 64 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 390X 8G 13555 points
Radeon HD 6990 5820 points
Difference: 7735 (133%)

Ethereum Mining Hash Rate

Radeon R9 390X 8G 32 Mh/s
Radeon HD 6990 24 Mh/s
Difference: 8 (33%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 390X 8G 275 Watts
Radeon HD 6990 375 Watts
Difference: 100 Watts (36%)

Memory Bandwidth

Theoretically, the Radeon R9 390X 8G should be just a bit faster than the Radeon HD 6990 overall. (explain)

Radeon R9 390X 8G 384000 MB/sec
Radeon HD 6990 320000 MB/sec
Difference: 64000 (20%)

Texel Rate

The Radeon R9 390X 8G is just a bit (approximately 16%) more effective at anisotropic filtering than the Radeon HD 6990. (explain)

Radeon R9 390X 8G 184800 Mtexels/sec
Radeon HD 6990 159360 Mtexels/sec
Difference: 25440 (16%)

Pixel Rate

The Radeon R9 390X 8G will be quite a bit (more or less 27%) more effective at full screen anti-aliasing than the Radeon HD 6990, and should be capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 390X 8G 67200 Mpixels/sec
Radeon HD 6990 53120 Mpixels/sec
Difference: 14080 (27%)

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 390X 8G

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 390X 8G
Manufacturer AMD AMD
Year March 2011 June 2015
Code Name Antilles Grenada XT
Memory 2048 MB (x2) 8192 MB
Core Speed 830 MHz (x2) 1050 MHz
Memory Speed 5000 MHz (x2) 6000 MHz
Power (Max TDP) 375 watts 275 watts
Bandwidth 320000 MB/sec 384000 MB/sec
Texel Rate 159360 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 1536 (x2) 2816
Texture Mapping Units 96 (x2) 176
Render Output Units 32 (x2) 64
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 512-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 6200 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 information (counted in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its 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 speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 6990

Amazon.com

Check prices at:

Radeon R9 390X 8G

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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