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Radeon HD 7850 vs Radeon R9 380X

Intro

The Radeon HD 7850 has core speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1024 SPUs as well as 64 Texture Address Units and 32 Rasterization Operator Units.

Compare those specs to the Radeon R9 380X, which makes use of a 28 nm design. AMD has set the core speed at 970 MHz. The GDDR5 RAM works at a frequency of 1425 MHz on this particular model. It features 2048 SPUs along with 128 TAUs 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 380X		9519 points
Radeon HD 7850		5200 points
	Difference: 4319 (83%)

Ethereum Mining Hash Rate

Radeon R9 380X		19 Mh/s
Radeon HD 7850		13 Mh/s
	Difference: 6 (46%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850		130 Watts
Radeon R9 380X		190 Watts
	Difference: 60 Watts (46%)

Memory Bandwidth

Theoretically, the Radeon R9 380X should perform a small bit faster than the Radeon HD 7850 overall. (explain)

Radeon R9 380X		182400 MB/sec
Radeon HD 7850		153600 MB/sec
	Difference: 28800 (19%)

Texel Rate

The Radeon R9 380X should be quite a bit (approximately 126%) faster with regards to anisotropic filtering than the Radeon HD 7850. (explain)

Radeon R9 380X		124160 Mtexels/sec
Radeon HD 7850		55040 Mtexels/sec
	Difference: 69120 (126%)

Pixel Rate

The Radeon R9 380X should be just a bit (more or less 13%) better at full screen anti-aliasing than the Radeon HD 7850, and should be able to handle higher screen resolutions better. (explain)

Radeon R9 380X		31040 Mpixels/sec
Radeon HD 7850		27520 Mpixels/sec
	Difference: 3520 (13%)

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 7850

Amazon.com

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Radeon R9 380X

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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 7850	Radeon R9 380X
Manufacturer	AMD	AMD
Year	March 2012	November 2015
Code Name	Pitcairn Pro	Tonga XT
Memory	2048 MB	4096 MB
Core Speed	860 MHz	970 MHz
Memory Speed	4800 MHz	5700 MHz
Power (Max TDP)	130 watts	190 watts
Bandwidth	153600 MB/sec	182400 MB/sec
Texel Rate	55040 Mtexels/sec	124160 Mtexels/sec
Pixel Rate	27520 Mpixels/sec	31040 Mpixels/sec
Unified Shaders	1024	2048
Texture Mapping Units	64	128
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 x16
DirectX Version	DirectX 11.1	DirectX 12.0
OpenGL Version	OpenGL 4.2	OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's 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 also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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