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Radeon HD 3870 1GB vs Radeon R9 M280X

Intro

The Radeon HD 3870 1GB features clock speeds of 775 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR4 memory. It features 320(64x5) SPUs along with 16 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon R9 M280X, which features a clock speed of 900 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is comprised of 896 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X 75 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 31 Watts (41%)

Memory Bandwidth

Theoretically, the Radeon R9 M280X should perform a lot faster than the Radeon HD 3870 1GB overall. (explain)

Radeon R9 M280X 88000 MB/sec
Radeon HD 3870 1GB 72000 MB/sec
Difference: 16000 (22%)

Texel Rate

The Radeon R9 M280X should be quite a bit (more or less 306%) better at AF than the Radeon HD 3870 1GB. (explain)

Radeon R9 M280X 50400 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 38000 (306%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 M280X is the winner, though not by far. (explain)

Radeon R9 M280X 14400 Mpixels/sec
Radeon HD 3870 1GB 12400 Mpixels/sec
Difference: 2000 (16%)

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 3870 1GB

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 3870 1GB Radeon R9 M280X
Manufacturer AMD AMD
Year Nov 19, 2007 Feb 9 2015
Code Name RV670 XT Saturn XT
Memory 1024 MB 4096 MB
Core Speed 775 MHz 900 MHz
Memory Speed 2250 MHz 5500 MHz
Power (Max TDP) 106 watts 75 watts
Bandwidth 72000 MB/sec 88000 MB/sec
Texel Rate 12400 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 320(64x5) 896
Texture Mapping Units 16 56
Render Output Units 16 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/AGP 8x 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 megabytes per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better 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 figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

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

Display Prices

Hide Prices

Radeon HD 3870 1GB

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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