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Radeon HD 4870 1GB vs Radeon R9 M390X

Intro

The Radeon HD 4870 1GB comes with clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Compare all that to the Radeon R9 M390X, which makes use of a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 RAM runs at a frequency of 1250 MHz on this particular card. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 25 Watts (20%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M390X should be much faster than the Radeon HD 4870 1GB in general. (explain)

Radeon R9 M390X 160000 MB/sec
Radeon HD 4870 1GB 115200 MB/sec
Difference: 44800 (39%)

Texel Rate

The Radeon R9 M390X is a lot (about 208%) more effective at AF than the Radeon HD 4870 1GB. (explain)

Radeon R9 M390X 92544 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 62544 (208%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 M390X is a better choice, by a large margin. (explain)

Radeon R9 M390X 23136 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 11136 (93%)

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 M390X

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 M390X
Manufacturer AMD AMD
Year Jun 25, 2008 2015
Code Name RV770 XT Tonga
Memory 1024 MB 4096 MB
Core Speed 750 MHz 723 MHz
Memory Speed 3600 MHz 5000 MHz
Power (Max TDP) 150 watts 125 watts
Bandwidth 115200 MB/sec 160000 MB/sec
Texel Rate 30000 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 800(160x5) 2048
Texture Mapping Units 40 128
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-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: Bandwidth is the largest amount of data (in units of MB per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the 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 most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 1GB

Amazon.com

Check prices at:

Radeon R9 M390X

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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