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Radeon HD 3870 X2 1GB vs Radeon R9 M395X

Intro

The Radeon HD 3870 X2 1GB comes with core speeds of 825 MHz on the GPU, and 1126 MHz on the 1024 MB of GDDR4 RAM. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon R9 M395X, which features GPU core speed of 723 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M395X should be a bit faster than the Radeon HD 3870 X2 1GB overall. (explain)

Radeon R9 M395X 160000 MB/sec
Radeon HD 3870 X2 1GB 144128 MB/sec
Difference: 15872 (11%)

Texel Rate

The Radeon R9 M395X should be quite a bit (approximately 251%) more effective at anisotropic filtering than the Radeon HD 3870 X2 1GB. (explain)

Radeon R9 M395X 92544 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 66144 (251%)

Pixel Rate

The Radeon HD 3870 X2 1GB should be a little bit (more or less 14%) faster with regards to anti-aliasing than the Radeon R9 M395X, and also able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Radeon R9 M395X 23136 Mpixels/sec
Difference: 3264 (14%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 3870 X2 1GB

Amazon.com

Check prices at:

Radeon R9 M395X

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 X2 1GB Radeon R9 M395X
Manufacturer AMD AMD
Year Jan 28, 2008 2015
Code Name R680 Tonga
Memory 1024 MB (x2) 4096 MB
Core Speed 825 MHz (x2) 723 MHz
Memory Speed 2252 MHz (x2) 5000 MHz
Power (Max TDP) (Unknown) watts 125 watts
Bandwidth 144128 MB/sec 160000 MB/sec
Texel Rate 26400 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 320(64x5) (x2) 2048
Texture Mapping Units 16 (x2) 128
Render Output Units 16 (x2) 32
Bus Type GDDR4 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 12
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 moved past the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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

Display Prices

Hide Prices

Radeon HD 3870 X2 1GB

Amazon.com

Check prices at:

Radeon R9 M395X

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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