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Radeon HD 3870 X2 1GB vs Radeon R9 M395X

Intro

The Radeon HD 3870 X2 1GB comes with a core clock frequency of 825 MHz and a GDDR4 memory speed of 1126 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It is comprised of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon R9 M395X, which has a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 memory 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 little 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 is quite a bit (more or less 251%) more effective at texture 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

If using high levels of AA is important to you, then the Radeon HD 3870 X2 1GB is the winner, but only just. (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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max 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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