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Radeon R9 390 8G vs Radeon R9 390X 8G

Intro

The Radeon R9 390 8G has a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 512-bit memory bus, and makes use of a 28 nm design. It is made up of 2560 SPUs, 160 TAUs, and 64 Raster Operation Units.

Compare those specs to the Radeon R9 390X 8G, which uses a 28 nm design. AMD has clocked the core frequency at 1050 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this particular card. 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 390 8G 12733 points
Difference: 822 (6%)

Zcash Mining Hash Rate

Radeon R9 390X 8G 330 Sol/s
Radeon R9 390 8G 326 Sol/s
Difference: 4 (1%)

Ethereum Mining Hash Rate

Radeon R9 390X 8G 32 Mh/s
Radeon R9 390 8G 28 Mh/s
Difference: 4 (14%)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Both cards have the exact same bandwidth, so in theory they should perform exactly the same. (explain)

Texel Rate

The Radeon R9 390X 8G should be just a bit (more or less 16%) better at texture filtering than the Radeon R9 390 8G. (explain)

Radeon R9 390X 8G 184800 Mtexels/sec
Radeon R9 390 8G 160000 Mtexels/sec
Difference: 24800 (16%)

Pixel Rate

The Radeon R9 390X 8G will be a bit (approximately 5%) faster with regards to AA than the Radeon R9 390 8G, and also will be able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 390X 8G 67200 Mpixels/sec
Radeon R9 390 8G 64000 Mpixels/sec
Difference: 3200 (5%)

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 390 8G

Amazon.com

Radeon R9 390X 8G

Amazon.com

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 390 8G Radeon R9 390X 8G
Manufacturer AMD AMD
Year June 2015 June 2015
Code Name Grenada PRO Grenada XT
Memory 8192 MB 8192 MB
Core Speed 1000 MHz 1050 MHz
Memory Speed 6000 MHz 6000 MHz
Power (Max TDP) 275 watts 275 watts
Bandwidth 384000 MB/sec 384000 MB/sec
Texel Rate 160000 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 64000 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 2560 2816
Texture Mapping Units 160 176
Render Output Units 64 64
Bus Type GDDR5 GDDR5
Bus Width 512-bit 512-bit
Fab Process 28 nm 28 nm
Transistors 6200 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 maximum amount of data (measured in MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 applied in one second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon R9 390 8G

Amazon.com

Radeon R9 390X 8G

Amazon.com

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.

Comments

One Response to “Radeon R9 390 8G vs Radeon R9 390X 8G”
erick says:

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