Radeon R9 280X vs Radeon R9 390X 8G

Intro

Compare those specifications to the Radeon R9 390X 8G, which has a core clock speed of 1050 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 512-bit memory bus, and makes use of a 28 nm design. It is comprised of 2816 SPUs, 176 Texture Address Units, and 64 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 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

Performance-wise, the Radeon R9 390X 8G should in theory be much superior to the Radeon R9 280X in general. (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 (about 70%) more effective at texture filtering than the Radeon R9 280X. (explain)

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

Pixel Rate

The Radeon R9 390X 8G is quite a bit (about 147%) better at FSAA than the Radeon R9 280X, and also will be able to handle higher screen resolutions more effectively. (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: Bandwidth is the largest amount of data (counted in MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics 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 video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. 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 fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.