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Radeon HD 7870 XT vs Radeon R9 380 4G

Intro

The Radeon HD 7870 XT features a core clock speed of 925 MHz and a GDDR5 memory frequency of 1500 MHz. It also features a 256-bit bus, and uses a 28 nm design. It is made up of 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon R9 380 4G, which has a clock frequency of 970 MHz and a GDDR5 memory speed of 1425 MHz. It also uses a 256-bit bus, and makes use of a 28 nm design. It is made up of 1792 SPUs, 112 TAUs, and 32 Raster Operation Units.

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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 XT		6390 points
	Difference: 2447 (38%)

Ethereum Mining Hash Rate

Radeon R9 380 4G		21 Mh/s
Radeon HD 7870 XT		15 Mh/s
	Difference: 6 (40%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT		185 Watts
Radeon R9 380 4G		190 Watts
	Difference: 5 Watts (3%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 XT should be a little bit faster than the Radeon R9 380 4G in general. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon R9 380 4G		182400 MB/sec
	Difference: 9600 (5%)

Texel Rate

The Radeon R9 380 4G should be much (about 22%) more effective at AF than the Radeon HD 7870 XT. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon HD 7870 XT		88800 Mtexels/sec
	Difference: 19840 (22%)

Pixel Rate

The Radeon R9 380 4G is a bit (about 5%) faster with regards to anti-aliasing than the Radeon HD 7870 XT, and able to handle higher resolutions without slowing down too much. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon HD 7870 XT		29600 Mpixels/sec
	Difference: 1440 (5%)

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 XT

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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 XT	Radeon R9 380 4G
Manufacturer	AMD	AMD
Year	November 2012	June 2015
Code Name	Tahiti LE	Antigua PRO
Memory	2048 MB	4096 MB
Core Speed	925 MHz	970 MHz
Memory Speed	6000 MHz	5700 MHz
Power (Max TDP)	185 watts	190 watts
Bandwidth	192000 MB/sec	182400 MB/sec
Texel Rate	88800 Mtexels/sec	108640 Mtexels/sec
Pixel Rate	29600 Mpixels/sec	31040 Mpixels/sec
Unified Shaders	1536	1792
Texture Mapping Units	96	112
Render Output Units	32	32
Bus Type	GDDR5	GDDR5
Bus Width	256-bit	256-bit
Fab Process	28 nm	28 nm
Transistors	4313 million	5000 million
Bus	PCIe 3.0 x16	PCIe 3.0 ×16
DirectX Version	DirectX 11.1	DirectX 12.0
OpenGL Version	OpenGL 4.3	OpenGL 4.5

Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

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