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Radeon HD 4870 1GB vs Radeon R9 M385X

Intro

The Radeon HD 4870 1GB has a GPU core clock speed of 750 MHz, and the 1024 MB of GDDR5 memory runs at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon R9 M385X, which comes with clock speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 RAM. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 1GB is 20% quicker than the Radeon R9 M385X in general, due to its greater bandwidth. (explain)

Radeon HD 4870 1GB 115200 MB/sec
Radeon R9 M385X 96000 MB/sec
Difference: 19200 (20%)

Texel Rate

The Radeon R9 M385X will be much (about 105%) faster with regards to texture filtering than the Radeon HD 4870 1GB. (explain)

Radeon R9 M385X 61600 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 31600 (105%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 M385X is the winner, by far. (explain)

Radeon R9 M385X 17600 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 5600 (47%)

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 4870 1GB

Amazon.com

Check prices at:

Radeon R9 M385X

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 4870 1GB Radeon R9 M385X
Manufacturer AMD AMD
Year Jun 25, 2008 2015
Code Name RV770 XT Bonaire
Memory 1024 MB 4096 MB
Core Speed 750 MHz 1100 MHz
Memory Speed 3600 MHz 6000 MHz
Power (Max TDP) 150 watts (Unknown) watts
Bandwidth 115200 MB/sec 96000 MB/sec
Texel Rate 30000 Mtexels/sec 61600 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 17600 Mpixels/sec
Unified Shaders 800(160x5) 896
Texture Mapping Units 40 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 956 million (Unknown) million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 12
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of 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 this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines 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 quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 1GB

Amazon.com

Check prices at:

Radeon R9 M385X

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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