Radeon R9 380X vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which comes with a core clock frequency of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 512-bit bus, and makes use of a 28 nm design. It is comprised of 2560 SPUs, 160 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 390 8G		12733 points
Radeon R9 380X		9519 points
	Difference: 3214 (34%)

Ethereum Mining Hash Rate

Radeon R9 390 8G		28 Mh/s
Radeon R9 380X		19 Mh/s
	Difference: 9 (47%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380X		190 Watts
Radeon R9 390 8G		275 Watts
	Difference: 85 Watts (45%)

Memory Bandwidth

The Radeon R9 390 8G should theoretically be much faster than the Radeon R9 380X in general. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R9 380X		182400 MB/sec
	Difference: 201600 (111%)

Texel Rate

The Radeon R9 390 8G will be a lot (more or less 29%) faster with regards to anisotropic filtering than the Radeon R9 380X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 380X		124160 Mtexels/sec
	Difference: 35840 (29%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 390 8G is superior to the Radeon R9 380X, by a large margin. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 380X		31040 Mpixels/sec
	Difference: 32960 (106%)

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 data (counted in MB per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video 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 number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.