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Radeon HD 3870 512MB vs Radeon R9 M265X

Intro

The Radeon HD 3870 512MB features a clock frequency of 775 MHz and a GDDR3 memory speed of 900 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It features 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon R9 M265X, which has core clock speeds of 575 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 M265X will be 25% quicker than the Radeon HD 3870 512MB overall, due to its higher data rate. (explain)

Radeon R9 M265X 72000 MB/sec
Radeon HD 3870 512MB 57600 MB/sec
Difference: 14400 (25%)

Texel Rate

The Radeon R9 M265X will be quite a bit (about 85%) more effective at AF than the Radeon HD 3870 512MB. (explain)

Radeon R9 M265X 23000 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 10600 (85%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 3870 512MB is the winner, by far. (explain)

Radeon HD 3870 512MB 12400 Mpixels/sec
Radeon R9 M265X 9200 Mpixels/sec
Difference: 3200 (35%)

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

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Radeon R9 M265X

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 M265X
Manufacturer AMD AMD
Year Nov 19, 2007 May 1 2014
Code Name RV670 XT Venus Pro
Memory 512 MB 2048 MB
Core Speed 775 MHz 575 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 23000 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 9200 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 largest amount of information (measured in megabytes per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units by the core 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 512MB

Amazon.com

Check prices at:

Radeon R9 M265X

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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