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Radeon HD 6790 vs Radeon R9 M395X

Intro

The Radeon HD 6790 comes with a GPU core clock speed of 840 MHz, and the 1024 MB of GDDR5 RAM runs at 1050 MHz through a 256-bit bus. It also is comprised of 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon R9 M395X, which features clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X 125 Watts
Radeon HD 6790 150 Watts
Difference: 25 Watts (20%)

Memory Bandwidth

The Radeon R9 M395X should in theory perform a small bit faster than the Radeon HD 6790 in general. (explain)

Radeon R9 M395X 160000 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 25600 (19%)

Texel Rate

The Radeon R9 M395X should be a lot (about 175%) faster with regards to texture filtering than the Radeon HD 6790. (explain)

Radeon R9 M395X 92544 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 58944 (175%)

Pixel Rate

The Radeon R9 M395X will be quite a bit (more or less 72%) more effective at FSAA than the Radeon HD 6790, and also capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 M395X 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

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Radeon HD 6790

Amazon.com

Check prices at:

Radeon R9 M395X

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 M395X
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 (counted in MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's 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 texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. 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 fill rate also depends on lots of other factors, most notably 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 6790

Amazon.com

Check prices at:

Radeon R9 M395X

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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