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Radeon R9 280 vs Radeon R9 390X 8G

Intro

The Radeon R9 280 makes use of a 28 nm design. AMD has set the core frequency at 933 MHz. The GDDR5 RAM runs at a frequency of 1250 MHz on this card. It features 1792 SPUs along with 112 Texture Address Units and 32 ROPs.

Compare those specifications to the Radeon R9 390X 8G, which features clock speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2816 SPUs along with 176 Texture Address Units and 64 ROPs.

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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 280 7961 points
Difference: 5594 (70%)

Zcash Mining Hash Rate

Radeon R9 390X 8G 330 Sol/s
Radeon R9 280 183 Sol/s
Difference: 147 (80%)

Ethereum Mining Hash Rate

Radeon R9 390X 8G 32 Mh/s
Radeon R9 280 22 Mh/s
Difference: 10 (45%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the Radeon R9 390X 8G should in theory be quite a bit better than the Radeon R9 280 overall. (explain)

Radeon R9 390X 8G 384000 MB/sec
Radeon R9 280 240000 MB/sec
Difference: 144000 (60%)

Texel Rate

The Radeon R9 390X 8G is quite a bit (approximately 77%) more effective at texture filtering than the Radeon R9 280. (explain)

Radeon R9 390X 8G 184800 Mtexels/sec
Radeon R9 280 104496 Mtexels/sec
Difference: 80304 (77%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 390X 8G is superior to the Radeon R9 280, by a large margin. (explain)

Radeon R9 390X 8G 67200 Mpixels/sec
Radeon R9 280 29856 Mpixels/sec
Difference: 37344 (125%)

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

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Radeon R9 280

Amazon.com

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Radeon R9 390X 8G

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon R9 280 Radeon R9 390X 8G
Manufacturer AMD AMD
Year March 2014 June 2015
Code Name Tahiti Pro Grenada XT
Memory 3072 MB 8192 MB
Core Speed 933 MHz 1050 MHz
Memory Speed 5000 MHz 6000 MHz
Power (Max TDP) 250 watts 275 watts
Bandwidth 240000 MB/sec 384000 MB/sec
Texel Rate 104496 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 29856 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 1792 2816
Texture Mapping Units 112 176
Render Output Units 32 64
Bus Type GDDR5 GDDR5
Bus Width 384-bit 512-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 6200 million
Bus PCIe 3.0 x16 PCIe 3.0 ×16
DirectX Version DirectX 11.2 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total amount of texture units 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon R9 280

Amazon.com

Check prices at:

Radeon R9 390X 8G

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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