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Radeon HD 4870 2GB vs Radeon R9 380 4G

Intro

The Radeon HD 4870 2GB comes with a clock speed of 750 MHz and a GDDR5 memory speed of 900 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon R9 380 4G, which uses a 28 nm design. AMD has set the core speed at 970 MHz. The GDDR5 RAM is set to run at a frequency of 1425 MHz on this specific card. It features 1792 SPUs along with 112 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 2GB 150 Watts
Radeon R9 380 4G 190 Watts
Difference: 40 Watts (27%)

Memory Bandwidth

In theory, the Radeon R9 380 4G should be much faster than the Radeon HD 4870 2GB overall. (explain)

Radeon R9 380 4G 182400 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 67200 (58%)

Texel Rate

The Radeon R9 380 4G should be quite a bit (approximately 262%) more effective at AF than the Radeon HD 4870 2GB. (explain)

Radeon R9 380 4G 108640 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 78640 (262%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 380 4G is superior to the Radeon HD 4870 2GB, by far. (explain)

Radeon R9 380 4G 31040 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 19040 (159%)

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 380 4G

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 380 4G
Manufacturer AMD AMD
Year Jun 25, 2008 June 2015
Code Name RV770 XT Antigua PRO
Memory 2048 MB 4096 MB
Core Speed 750 MHz 970 MHz
Memory Speed 3600 MHz 5700 MHz
Power (Max TDP) 150 watts 190 watts
Bandwidth 115200 MB/sec 182400 MB/sec
Texel Rate 30000 Mtexels/sec 108640 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 31040 Mpixels/sec
Unified Shaders 800(160x5) 1792
Texture Mapping Units 40 112
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 28 nm
Transistors 956 million 5000 million
Bus PCIe 2.0 x16 PCIe 3.0 ×16
DirectX Version DirectX 10.1 DirectX 12.0
OpenGL Version OpenGL 3.0 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4870 2GB

Amazon.com

Check prices at:

Radeon R9 380 4G

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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