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Radeon HD 6790 vs Radeon R9 M390X

Intro

The Radeon HD 6790 features core speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon R9 M390X, which uses a 28 nm design. AMD has clocked the core frequency at 723 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this specific card. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
Radeon HD 6790 150 Watts
Difference: 25 Watts (20%)

Memory Bandwidth

The Radeon R9 M390X should theoretically be a little bit faster than the Radeon HD 6790 in general. (explain)

Radeon R9 M390X 160000 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 25600 (19%)

Texel Rate

The Radeon R9 M390X will be a lot (approximately 175%) better at anisotropic filtering than the Radeon HD 6790. (explain)

Radeon R9 M390X 92544 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 58944 (175%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 M390X is the winner, by a large margin. (explain)

Radeon R9 M390X 23136 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 9696 (72%)

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.

Price Comparison

Display Prices

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Radeon HD 6790

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 6790 Radeon R9 M390X
Manufacturer AMD AMD
Year April 2011 2015
Code Name Barts LE Tonga
Memory 1024 MB 4096 MB
Core Speed 840 MHz 723 MHz
Memory Speed 4200 MHz 5000 MHz
Power (Max TDP) 150 watts 125 watts
Bandwidth 134400 MB/sec 160000 MB/sec
Texel Rate 33600 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 800 2048
Texture Mapping Units 40 128
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 1700 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: Bandwidth is the maximum amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). 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 ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 6790

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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