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Radeon HD 4790 vs Radeon R9 M280X

Intro

The Radeon HD 4790 makes use of a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR5 memory is set to run at a speed of 800 MHz on this particular card. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Compare all that to the Radeon R9 M280X, which uses a 28 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 memory runs at a frequency of 1375 MHz on this specific model. It features 896 SPUs along with 56 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4790 should perform a little bit faster than the Radeon R9 M280X overall. (explain)

Radeon HD 4790 102400 MB/sec
Radeon R9 M280X 88000 MB/sec
Difference: 14400 (16%)

Texel Rate

The Radeon R9 M280X should be a lot (approximately 163%) more effective at anisotropic filtering than the Radeon HD 4790. (explain)

Radeon R9 M280X 50400 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 31200 (163%)

Pixel Rate

The Radeon R9 M280X is quite a bit (about 50%) more effective at AA than the Radeon HD 4790, and also capable of handling higher screen resolutions better. (explain)

Radeon R9 M280X 14400 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 4800 (50%)

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 4790

Amazon.com

Check prices at:

Radeon R9 M280X

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 4790 Radeon R9 M280X
Manufacturer AMD AMD
Year 2009 Feb 9 2015
Code Name RV790 Saturn XT
Memory 512 MB 4096 MB
Core Speed 600 MHz 900 MHz
Memory Speed 3200 MHz 5500 MHz
Power (Max TDP) (Unknown) watts 75 watts
Bandwidth 102400 MB/sec 88000 MB/sec
Texel Rate 19200 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 640(128x5) 896
Texture Mapping Units 32 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 959 million (Unknown) million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.2
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the 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 number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4790

Amazon.com

Check prices at:

Radeon R9 M280X

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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