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Radeon HD 3870 X2 512MB vs Radeon RX 470

Intro

The Radeon HD 3870 X2 512MB has a GPU core clock speed of 825 MHz, and the 512 MB of GDDR3 memory runs at 900 MHz through a 256-bit bus. It also is comprised of 320(64x5) Stream Processors, 16 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon RX 470, which features a clock speed of 926 MHz and a GDDR5 memory frequency of 1650 MHz. It also uses a 256-bit bus, and uses a 14 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon RX 470 should be 83% faster than the Radeon HD 3870 X2 512MB in general, due to its greater bandwidth. (explain)

Radeon RX 470 211200 MB/sec
Radeon HD 3870 X2 512MB 115200 MB/sec
Difference: 96000 (83%)

Texel Rate

The Radeon RX 470 is a lot (about 349%) more effective at texture filtering than the Radeon HD 3870 X2 512MB. (explain)

Radeon RX 470 118528 Mtexels/sec
Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Difference: 92128 (349%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon RX 470 is superior to the Radeon HD 3870 X2 512MB, not by a very large margin though. (explain)

Radeon RX 470 29632 Mpixels/sec
Radeon HD 3870 X2 512MB 26400 Mpixels/sec
Difference: 3232 (12%)

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 512MB

Amazon.com

Check prices at:

Radeon RX 470

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 512MB Radeon RX 470
Manufacturer AMD AMD
Year Jan 28, 2008 August 2016
Code Name R680 Polaris 10
Memory 512 MB (x2) 8192 MB
Core Speed 825 MHz (x2) 926 MHz
Memory Speed 1800 MHz (x2) 6600 MHz
Power (Max TDP) (Unknown) watts 120 watts
Bandwidth 115200 MB/sec 211200 MB/sec
Texel Rate 26400 Mtexels/sec 118528 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 29632 Mpixels/sec
Unified Shaders 320(64x5) (x2) 2048
Texture Mapping Units 16 (x2) 128
Render Output Units 16 (x2) 32
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 14 nm
Transistors (Unknown) million 5700 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 12.0
OpenGL Version OpenGL 3.0 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 reach the maximum fill rate.

Display Prices

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Radeon HD 3870 X2 512MB

Amazon.com

Check prices at:

Radeon RX 470

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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