Radeon R9 280X vs Radeon R9 390X 8G

Intro

Compare all that to the Radeon R9 390X 8G, which has GPU core speed of 1050 MHz, and 8192 MB of GDDR5 RAM set to run at 1500 MHz through a 512-bit bus. It also is comprised of 2816 SPUs, 176 Texture Address Units, 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 280X		8886 points
	Difference: 4669 (53%)

Zcash Mining Hash Rate

Radeon R9 390X 8G		330 Sol/s
Radeon R9 280X		294 Sol/s
	Difference: 36 (12%)

Ethereum Mining Hash Rate

Radeon R9 390X 8G		32 Mh/s
Radeon R9 280X		21 Mh/s
	Difference: 11 (52%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 280X		250 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 25 Watts (10%)

Memory Bandwidth

As far as performance goes, the Radeon R9 390X 8G should in theory be a lot better than the Radeon R9 280X overall. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon R9 280X		288000 MB/sec
	Difference: 96000 (33%)

Texel Rate

The Radeon R9 390X 8G will be a lot (approximately 70%) more effective at AF than the Radeon R9 280X. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R9 280X		108800 Mtexels/sec
	Difference: 76000 (70%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 390X 8G is the winner, and very much so. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R9 280X		27200 Mpixels/sec
	Difference: 40000 (147%)

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 largest amount of information (counted in megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.