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Radeon HD 7790 vs Radeon RX 460


Intro

The Radeon HD 7790 makes use of a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a speed of 1500 MHz on this specific card. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Compare that to the Radeon RX 460, which comes with GPU clock speed of 1090 MHz, and 4096 MB of GDDR5 RAM set to run at 1750 MHz through a 128-bit bus. It also is comprised of 896 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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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 7790 4330 points
Difference: 1270 (29%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 460 75 Watts
Radeon HD 7790 85 Watts
Difference: 10 Watts (13%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 460 will be 17% quicker than the Radeon HD 7790 overall, because of its higher data rate. (explain)

Radeon RX 460 112000 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 16000 (17%)

Texel Rate

The Radeon RX 460 is just a bit (approximately 9%) better at AF than the Radeon HD 7790. (explain)

Radeon RX 460 61040 Mtexels/sec
Radeon HD 7790 56000 Mtexels/sec
Difference: 5040 (9%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 460 is the winner, but only just. (explain)

Radeon RX 460 17440 Mpixels/sec
Radeon HD 7790 16000 Mpixels/sec
Difference: 1440 (9%)

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 7790

Radeon RX 460

Specifications

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Model Radeon HD 7790 Radeon RX 460
Manufacturer AMD AMD
Year March 2013 August 2016
Code Name Bonaire XT Polaris 11
Memory 1024 MB 4096 MB
Core Speed 1000 MHz 1090 MHz
Memory Speed 6000 MHz 7000 MHz
Power (Max TDP) 85 watts 75 watts
Bandwidth 96000 MB/sec 112000 MB/sec
Texel Rate 56000 Mtexels/sec 61040 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 17440 Mpixels/sec
Unified Shaders 896 896
Texture Mapping Units 56 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 14 nm
Transistors 2080 million 3000 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core 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 maximum amount 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 calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Radeon HD 7790

Radeon RX 460

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