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Radeon HD 4870 2GB vs Radeon R9 M385X

Intro

The Radeon HD 4870 2GB comes with a GPU core speed of 750 MHz, and the 2048 MB of GDDR5 memory is set to run at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Compare those specifications to the Radeon R9 M385X, which uses a 28 nm design. AMD has clocked the core speed at 1100 MHz. The GDDR5 RAM works at a frequency of 1500 MHz on this particular card. It features 896 SPUs as well as 56 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 2GB should perform just a bit faster than the Radeon R9 M385X overall. (explain)

Radeon HD 4870 2GB 115200 MB/sec
Radeon R9 M385X 96000 MB/sec
Difference: 19200 (20%)

Texel Rate

The Radeon R9 M385X should be much (about 105%) better at texture filtering than the Radeon HD 4870 2GB. (explain)

Radeon R9 M385X 61600 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 31600 (105%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 M385X is superior to the Radeon HD 4870 2GB, and very much so. (explain)

Radeon R9 M385X 17600 Mpixels/sec
Radeon HD 4870 2GB 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 2GB

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 2GB Radeon R9 M385X
Manufacturer AMD AMD
Year Jun 25, 2008 2015
Code Name RV770 XT Bonaire
Memory 2048 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 data (in units of megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR 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 amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4870 2GB

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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