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Radeon R9 380 4G vs Radeon R9 390X 8G

Intro

The Radeon R9 380 4G comes with a GPU clock speed of 970 MHz, and the 4096 MB of GDDR5 RAM is set to run at 1425 MHz through a 256-bit bus. It also features 1792 Stream Processors, 112 TAUs, and 32 ROPs.

Compare all that to the Radeon R9 390X 8G, which features a 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 made up of 2816 SPUs, 176 TAUs, and 64 Raster Operation 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.

Ethereum Mining Hash Rate

Radeon R9 390X 8G 32 Mh/s
Radeon R9 380 4G 21 Mh/s
Difference: 11 (52%)

3DMark Fire Strike Graphics Score

Radeon R9 390X 8G 13555 points
Radeon R9 380 4G 8837 points
Difference: 4718 (53%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380 4G 190 Watts
Radeon R9 390X 8G 275 Watts
Difference: 85 Watts (45%)

Memory Bandwidth

In theory, the Radeon R9 390X 8G should be 111% faster than the Radeon R9 380 4G overall, because of its higher data rate. (explain)

Radeon R9 390X 8G 384000 MB/sec
Radeon R9 380 4G 182400 MB/sec
Difference: 201600 (111%)

Texel Rate

The Radeon R9 390X 8G should be quite a bit (about 70%) better at AF than the Radeon R9 380 4G. (explain)

Radeon R9 390X 8G 184800 Mtexels/sec
Radeon R9 380 4G 108640 Mtexels/sec
Difference: 76160 (70%)

Pixel Rate

The Radeon R9 390X 8G is quite a bit (approximately 116%) faster with regards to full screen anti-aliasing than the Radeon R9 380 4G, and also will be able to handle higher screen resolutions while still performing well. (explain)

Radeon R9 390X 8G 67200 Mpixels/sec
Radeon R9 380 4G 31040 Mpixels/sec
Difference: 36160 (116%)

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 380 4G

Amazon.com

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Radeon R9 390X 8G

Amazon.com

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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 380 4G Radeon R9 390X 8G
Manufacturer AMD AMD
Year June 2015 June 2015
Code Name Antigua PRO Grenada XT
Memory 4096 MB 8192 MB
Core Speed 970 MHz 1050 MHz
Memory Speed 5700 MHz 6000 MHz
Power (Max TDP) 190 watts 275 watts
Bandwidth 182400 MB/sec 384000 MB/sec
Texel Rate 108640 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 31040 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 256-bit 512-bit
Fab Process 28 nm 28 nm
Transistors 5000 million 6200 million
Bus PCIe 3.0 ×16 PCIe 3.0 ×16
DirectX Version DirectX 12.0 DirectX 12.0
OpenGL Version OpenGL 4.5 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of 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 most pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially 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 380 4G

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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