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Radeon R9 280 vs Radeon R9 390X 8G

Intro

The Radeon R9 280 uses a 28 nm design. AMD has clocked the core speed at 933 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this specific card. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

Compare all that to the Radeon R9 390X 8G, which makes use of a 28 nm design. AMD has set the core frequency at 1050 MHz. The GDDR5 RAM works at a frequency of 1500 MHz on this specific model. It features 2816 SPUs along with 176 TAUs and 64 Rasterization Operator Units.

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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

In theory, the Radeon R9 390X 8G is 60% quicker than the Radeon R9 280 in general, because of its higher bandwidth. (explain)

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

Texel Rate

The Radeon R9 390X 8G should be a lot (about 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 using high levels of AA is important to you, then the Radeon R9 390X 8G is the winner, by far. (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

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.

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 (measured in MB per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the card's clock speed. 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 is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum 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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