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Radeon HD 4790 vs Radeon R9 M380

Intro

The Radeon HD 4790 uses a 55 nm design. AMD has clocked the core frequency at 600 MHz. The GDDR5 memory runs at a speed of 800 MHz on this specific model. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Compare all of that to the Radeon R9 M380, which makes use of a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM works at a frequency of 1500 MHz on this particular model. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 4790 should be a bit faster than the Radeon R9 M380 overall. (explain)

Radeon HD 4790 102400 MB/sec
Radeon R9 M380 96000 MB/sec
Difference: 6400 (7%)

Texel Rate

The Radeon R9 M380 should be much (about 108%) better at AF than the Radeon HD 4790. (explain)

Radeon R9 M380 40000 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 20800 (108%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 M380 is a better choice, by a large margin. (explain)

Radeon R9 M380 16000 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 6400 (67%)

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 M380

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 M380
Manufacturer AMD AMD
Year 2009 2015
Code Name RV790 Cape Verde
Memory 512 MB 4096 MB
Core Speed 600 MHz 1000 MHz
Memory Speed 3200 MHz 6000 MHz
Power (Max TDP) (Unknown) watts (Unknown) watts
Bandwidth 102400 MB/sec 96000 MB/sec
Texel Rate 19200 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 640(128x5) 640
Texture Mapping Units 32 40
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 12
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the 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 M380

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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