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Radeon HD 6790 vs Radeon R9 390X 8G

Intro

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

Compare those specs to the Radeon R9 390X 8G, which comes with a GPU core clock speed of 1050 MHz, and 8192 MB of GDDR5 memory running at 1500 MHz through a 512-bit bus. It also is made up of 2816 Stream Processors, 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 6790 2150 points
Difference: 11405 (530%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
Radeon R9 390X 8G 275 Watts
Difference: 125 Watts (83%)

Memory Bandwidth

The Radeon R9 390X 8G should in theory perform much faster than the Radeon HD 6790 overall. (explain)

Radeon R9 390X 8G 384000 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 249600 (186%)

Texel Rate

The Radeon R9 390X 8G is much (approximately 450%) faster with regards to texture filtering than the Radeon HD 6790. (explain)

Radeon R9 390X 8G 184800 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 151200 (450%)

Pixel Rate

The Radeon R9 390X 8G should be a lot (about 400%) more effective at full screen anti-aliasing than the Radeon HD 6790, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 390X 8G 67200 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 53760 (400%)

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

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Radeon R9 390X 8G

Amazon.com

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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 390X 8G
Manufacturer AMD AMD
Year April 2011 June 2015
Code Name Barts LE Grenada XT
Memory 1024 MB 8192 MB
Core Speed 840 MHz 1050 MHz
Memory Speed 4200 MHz 6000 MHz
Power (Max TDP) 150 watts 275 watts
Bandwidth 134400 MB/sec 384000 MB/sec
Texel Rate 33600 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 800 2816
Texture Mapping Units 40 176
Render Output Units 16 64
Bus Type GDDR5 GDDR5
Bus Width 256-bit 512-bit
Fab Process 40 nm 28 nm
Transistors 1700 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: Bandwidth is the max amount of data (counted in MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs 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 output rate also depends on many 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 6790

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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