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Radeon HD 6790 vs Radeon R9 M395X

Intro

The Radeon HD 6790 makes use of a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 RAM runs at a frequency of 1050 MHz on this card. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon R9 M395X, which features core 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 TAUs and 32 Rasterization Operator Units.

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

In theory, the Radeon R9 M395X should be 19% quicker than the Radeon HD 6790 in general, due to its greater data rate. (explain)

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

Texel Rate

The Radeon R9 M395X is quite a bit (more or less 175%) faster with regards to AF 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 should be quite a bit (more or less 72%) faster with regards to AA than the Radeon HD 6790, and should be capable of handling higher screen resolutions without losing too much performance. (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 data (in units of MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses 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 amount of texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units by the core 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to 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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