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Radeon HD 4790 vs Radeon R9 M280X

Intro

The Radeon HD 4790 uses a 55 nm design. AMD has set the core speed at 600 MHz. The GDDR5 RAM is set to run at a speed of 800 MHz on this card. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Compare those specifications to the Radeon R9 M280X, which features GPU clock speed of 900 MHz, and 4096 MB of GDDR5 RAM running at 1375 MHz through a 128-bit bus. It also is comprised of 896 Stream Processors, 56 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4790 should in theory perform a small 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 is much (about 163%) faster with regards to texture filtering than the Radeon HD 4790. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 M280X is superior to the Radeon HD 4790, by a large margin. (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

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Radeon R9 M280X

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 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 information (counted in MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR 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 by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - 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 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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