Radeon R9 285 vs Radeon R9 380 4G

Intro

Compare those specifications to the Radeon R9 380 4G, which features a core clock speed of 970 MHz and a GDDR5 memory speed of 1425 MHz. It also features 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.

Display Graphs

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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 R9 285		8500 points
	Difference: 337 (4%)

Ethereum Mining Hash Rate

Radeon R9 380 4G		21 Mh/s
Radeon R9 285		18 Mh/s
	Difference: 3 (17%)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically, the Radeon R9 380 4G should be a bit faster than the Radeon R9 285 overall. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R9 285		176000 MB/sec
	Difference: 6400 (4%)

Texel Rate

The Radeon R9 380 4G should be just a bit (approximately 6%) faster with regards to AF than the Radeon R9 285. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R9 285		102816 Mtexels/sec
	Difference: 5824 (6%)

Pixel Rate

The Radeon R9 380 4G is just a bit (more or less 6%) more effective at full screen anti-aliasing than the Radeon R9 285, and will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon R9 285		29376 Mpixels/sec
	Difference: 1664 (6%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number 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 output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.