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Radeon HD 3870 X2 1GB vs Radeon R9 M395X

Intro

The Radeon HD 3870 X2 1GB uses a 55 nm design. AMD has clocked the core speed at 825 MHz. The GDDR4 RAM is set to run at a frequency of 1126 MHz on this card. 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 uses a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 memory works at a frequency of 1250 MHz on this particular model. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon R9 M395X should theoretically be a little bit better than the Radeon HD 3870 X2 1GB in general. (explain)

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

Texel Rate

The Radeon R9 M395X will be quite a bit (more or less 251%) better at AF 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 a high screen resolution is important to you, then the Radeon HD 3870 X2 1GB is superior to the Radeon R9 M395X, though not by far. (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 maximum amount of information (counted in megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few 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

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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