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Radeon HD 3870 512MB vs Radeon R9 M270X

Intro

The Radeon HD 3870 512MB has a core clock speed of 775 MHz and a GDDR3 memory frequency of 900 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

Compare all of that to the Radeon R9 M270X, which features a core clock speed of 725 MHz and a GDDR5 memory frequency of 1125 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 M270X should theoretically perform much 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 is much (approximately 134%) better at AF 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 will be a small bit (about 7%) more effective at full screen anti-aliasing than the Radeon R9 M270X, and should be capable of handling 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: Bandwidth is the maximum amount of data (counted in MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, 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 that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant 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 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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