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Radeon HD 7870 XT vs Radeon R9 380 4G

Intro

The Radeon HD 7870 XT has a core clock speed of 925 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It is made up of 1536 SPUs, 96 TAUs, and 32 ROPs.

Compare that to the Radeon R9 380 4G, which uses a 28 nm design. AMD has clocked the core frequency at 970 MHz. The GDDR5 RAM runs at a speed of 1425 MHz on this particular model. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator 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

As far as performance goes, the Radeon HD 7870 XT should in theory be just a bit superior to the Radeon R9 380 4G overall. (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 is a lot (approximately 22%) better 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 small bit (approximately 5%) better at AA than the Radeon HD 7870 XT, and will be 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: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 can be applied per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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