Radeon R9 285 vs Radeon R9 390X 8G

Intro

Compare all of that to the Radeon R9 390X 8G, which makes use of a 28 nm design. AMD has set the core frequency at 1050 MHz. The GDDR5 RAM is set to run at a frequency of 1500 MHz on this particular card. It features 2816 SPUs along with 176 TAUs and 64 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 390X 8G		13555 points
Radeon R9 285		8500 points
	Difference: 5055 (59%)

Ethereum Mining Hash Rate

Radeon R9 390X 8G		32 Mh/s
Radeon R9 285		18 Mh/s
	Difference: 14 (78%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 285		190 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 85 Watts (45%)

Memory Bandwidth

Performance-wise, the Radeon R9 390X 8G should theoretically be much superior to the Radeon R9 285 overall. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon R9 285		176000 MB/sec
	Difference: 208000 (118%)

Texel Rate

The Radeon R9 390X 8G should be quite a bit (approximately 80%) faster with regards to AF than the Radeon R9 285. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R9 285		102816 Mtexels/sec
	Difference: 81984 (80%)

Pixel Rate

The Radeon R9 390X 8G will be a lot (approximately 129%) faster with regards to full screen anti-aliasing than the Radeon R9 285, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R9 285		29376 Mpixels/sec
	Difference: 37824 (129%)

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 maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be 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 the texel rate, the better the 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 chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.