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Radeon HD 6790 vs Radeon RX 460

Intro

The Radeon HD 6790 uses a 40 nm design. AMD has clocked the core speed at 840 MHz. The GDDR5 RAM runs at a frequency of 1050 MHz on this particular model. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon RX 460, which features a GPU core clock speed of 1090 MHz, and 4096 MB of GDDR5 RAM running at 1750 MHz through a 128-bit bus. It also is comprised of 896 SPUs, 56 TAUs, and 16 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 RX 460 5600 points
Radeon HD 6790 2150 points
Difference: 3450 (160%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 460 75 Watts
Radeon HD 6790 150 Watts
Difference: 75 Watts (100%)

Memory Bandwidth

Performance-wise, the Radeon HD 6790 should in theory be a little bit superior to the Radeon RX 460 overall. (explain)

Radeon HD 6790 134400 MB/sec
Radeon RX 460 112000 MB/sec
Difference: 22400 (20%)

Texel Rate

The Radeon RX 460 should be a lot (more or less 82%) better at anisotropic filtering than the Radeon HD 6790. (explain)

Radeon RX 460 61040 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 27440 (82%)

Pixel Rate

The Radeon RX 460 is quite a bit (about 30%) more effective at FSAA than the Radeon HD 6790, and will be able to handle higher resolutions while still performing well. (explain)

Radeon RX 460 17440 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 4000 (30%)

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

Radeon HD 6790

Radeon RX 460

Specifications

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Model Radeon HD 6790 Radeon RX 460
Manufacturer AMD AMD
Year April 2011 August 2016
Code Name Barts LE Polaris 11
Memory 1024 MB 4096 MB
Core Speed 840 MHz 1090 MHz
Memory Speed 4200 MHz 7000 MHz
Power (Max TDP) 150 watts 75 watts
Bandwidth 134400 MB/sec 112000 MB/sec
Texel Rate 33600 Mtexels/sec 61040 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 17440 Mpixels/sec
Unified Shaders 800 896
Texture Mapping Units 40 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 14 nm
Transistors 1700 million 3000 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 12.0
OpenGL Version OpenGL 4.1 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus 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 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 number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics 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 graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Radeon HD 6790

Radeon RX 460

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