Radeon R9 285 vs Radeon R9 380X

Intro

Compare those specifications to the Radeon R9 380X, which uses a 28 nm design. AMD has set the core speed at 970 MHz. The GDDR5 memory is set to run at a frequency of 1425 MHz on this specific card. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

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 380X		9519 points
Radeon R9 285		8500 points
	Difference: 1019 (12%)

Ethereum Mining Hash Rate

Radeon R9 380X		19 Mh/s
Radeon R9 285		18 Mh/s
	Difference: 1 (6%)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon R9 380X should be 4% faster than the Radeon R9 285 overall, because of its greater bandwidth. (explain)

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

Texel Rate

The Radeon R9 380X is much (about 21%) more effective at anisotropic filtering than the Radeon R9 285. (explain)

Radeon R9 380X		124160 Mtexels/sec
Radeon R9 285		102816 Mtexels/sec
	Difference: 21344 (21%)

Pixel Rate

The Radeon R9 380X is a little bit (more or less 6%) more effective at FSAA than the Radeon R9 285, and also capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 380X		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: Bandwidth is the max amount of information (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 are applied per second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per 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 sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.