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Radeon HD 3870 512MB vs Radeon R9 M270X

Intro

The Radeon HD 3870 512MB has core speeds of 775 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon R9 M270X, which comes with clock speeds of 725 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 memory. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon R9 M270X should perform a lot faster than the Radeon HD 3870 512MB overall. (explain)

Radeon R9 M270X 72000 MB/sec
Radeon HD 3870 512MB 57600 MB/sec
Difference: 14400 (25%)

Texel Rate

The Radeon R9 M270X should be a lot (about 134%) more effective at anisotropic filtering than the Radeon HD 3870 512MB. (explain)

Radeon R9 M270X 29000 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 16600 (134%)

Pixel Rate

The Radeon HD 3870 512MB is a little bit (approximately 7%) more effective at AA than the Radeon R9 M270X, and able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 3870 512MB 12400 Mpixels/sec
Radeon R9 M270X 11600 Mpixels/sec
Difference: 800 (7%)

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.

Price Comparison

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Radeon HD 3870 512MB

Amazon.com

Check prices at:

Radeon R9 M270X

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 512MB Radeon R9 M270X
Manufacturer AMD AMD
Year Nov 19, 2007 May 1 2014
Code Name RV670 XT Venus XT
Memory 512 MB 2048 MB
Core Speed 775 MHz 725 MHz
Memory Speed 1800 MHz 4500 MHz
Power (Max TDP) 106 watts (Unknown) watts
Bandwidth 57600 MB/sec 72000 MB/sec
Texel Rate 12400 Mtexels/sec 29000 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 320(64x5) 640
Texture Mapping Units 16 40
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/AGP 8x PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.2
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 512MB

Amazon.com

Check prices at:

Radeon R9 M270X

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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