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Radeon HD 3870 X2 1GB vs Radeon R9 M390X

Intro

The Radeon HD 3870 X2 1GB comes with a GPU clock speed of 825 MHz, and the 1024 MB of GDDR4 memory runs at 1126 MHz through a 256-bit bus. It also features 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Compare that to the Radeon R9 M390X, which has a core clock frequency of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon R9 M390X should theoretically be a little bit superior to the Radeon HD 3870 X2 1GB overall. (explain)

Radeon R9 M390X 160000 MB/sec
Radeon HD 3870 X2 1GB 144128 MB/sec
Difference: 15872 (11%)

Texel Rate

The Radeon R9 M390X will be much (approximately 251%) faster with regards to AF than the Radeon HD 3870 X2 1GB. (explain)

Radeon R9 M390X 92544 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 66144 (251%)

Pixel Rate

The Radeon HD 3870 X2 1GB is a little bit (approximately 14%) faster with regards to full screen anti-aliasing than the Radeon R9 M390X, and able to handle higher resolutions more effectively. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Radeon R9 M390X 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 M390X

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 M390X
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 information (in units of megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the 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 number of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core 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 rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 1GB

Amazon.com

Check prices at:

Radeon R9 M390X

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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