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Radeon HD 7870 vs Radeon R9 380 4G

Intro

The Radeon HD 7870 makes use of a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a speed of 1200 MHz on this specific model. It features 1280 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.

Compare those specifications to the Radeon R9 380 4G, which features a GPU core clock speed of 970 MHz, and 4096 MB of GDDR5 memory running at 1425 MHz through a 256-bit bus. It also is made up of 1792 Stream Processors, 112 TAUs, and 32 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 380 4G		8837 points
Radeon HD 7870		6230 points
	Difference: 2607 (42%)

Ethereum Mining Hash Rate

Radeon R9 380 4G		21 Mh/s
Radeon HD 7870		16 Mh/s
	Difference: 5 (31%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870		175 Watts
Radeon R9 380 4G		190 Watts
	Difference: 15 Watts (9%)

Memory Bandwidth

The Radeon R9 380 4G should theoretically perform a small bit faster than the Radeon HD 7870 overall. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon HD 7870		153600 MB/sec
	Difference: 28800 (19%)

Texel Rate

The Radeon R9 380 4G should be quite a bit (more or less 36%) faster with regards to AF than the Radeon HD 7870. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon HD 7870		80000 Mtexels/sec
	Difference: 28640 (36%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7870 is a better choice, though only just barely. (explain)

Radeon HD 7870		32000 Mpixels/sec
Radeon R9 380 4G		31040 Mpixels/sec
	Difference: 960 (3%)

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 7870

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Radeon R9 380 4G

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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 7870	Radeon R9 380 4G
Manufacturer	AMD	AMD
Year	March 2012	June 2015
Code Name	Pitcairn XT	Antigua PRO
Memory	2048 MB	4096 MB
Core Speed	1000 MHz	970 MHz
Memory Speed	4800 MHz	5700 MHz
Power (Max TDP)	175 watts	190 watts
Bandwidth	153600 MB/sec	182400 MB/sec
Texel Rate	80000 Mtexels/sec	108640 Mtexels/sec
Pixel Rate	32000 Mpixels/sec	31040 Mpixels/sec
Unified Shaders	1280	1792
Texture Mapping Units	80	112
Render Output Units	32	32
Bus Type	GDDR5	GDDR5
Bus Width	256-bit	256-bit
Fab Process	28 nm	28 nm
Transistors	2800 million	5000 million
Bus	PCIe 3.0 x16	PCIe 3.0 ×16
DirectX Version	DirectX 11.1	DirectX 12.0
OpenGL Version	OpenGL 4.2	OpenGL 4.5

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 are applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling 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 can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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