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Radeon R9 280 vs Radeon R9 390X 8G

Intro

The Radeon R9 280 comes with clock speeds of 933 MHz on the GPU, and 1250 MHz on the 3072 MB of GDDR5 RAM. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

Compare all of that to the Radeon R9 390X 8G, which features GPU clock 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 TAUs, 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

Theoretically speaking, the Radeon R9 390X 8G will be 60% faster than the Radeon R9 280 in general, because of its greater data rate. (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 much (about 77%) more effective at anisotropic 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

The Radeon R9 390X 8G will be a lot (more or less 125%) faster with regards to AA than the Radeon R9 280, and will be capable of handling higher screen resolutions without losing too much performance. (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 largest amount of information (in units of MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video 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 maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach 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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