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Radeon HD 6990 vs Radeon R9 M390X

Intro

The Radeon HD 6990 features a core clock speed of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 1536 SPUs, 96 Texture Address Units, and 32 ROPs.

Compare those specifications to the Radeon R9 M390X, which comes with a clock frequency of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 256-bit bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
Radeon HD 6990 375 Watts
Difference: 250 Watts (200%)

Memory Bandwidth

The Radeon HD 6990 should in theory perform a lot faster than the Radeon R9 M390X in general. (explain)

Radeon HD 6990 320000 MB/sec
Radeon R9 M390X 160000 MB/sec
Difference: 160000 (100%)

Texel Rate

The Radeon HD 6990 should be quite a bit (more or less 72%) faster with regards to AF than the Radeon R9 M390X. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon R9 M390X 92544 Mtexels/sec
Difference: 66816 (72%)

Pixel Rate

The Radeon HD 6990 is a lot (about 130%) faster with regards to AA than the Radeon R9 M390X, and also will be capable of handling higher resolutions better. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon R9 M390X 23136 Mpixels/sec
Difference: 29984 (130%)

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 M390X

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 M390X
Manufacturer AMD AMD
Year March 2011 2015
Code Name Antilles Tonga
Memory 2048 MB (x2) 4096 MB
Core Speed 830 MHz (x2) 723 MHz
Memory Speed 5000 MHz (x2) 5000 MHz
Power (Max TDP) 375 watts 125 watts
Bandwidth 320000 MB/sec 160000 MB/sec
Texel Rate 159360 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 23136 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 (Unknown) million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 12
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. 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 amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 6990

Amazon.com

Check prices at:

Radeon R9 M390X

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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