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GeForce GTX 660 vs Radeon R9 M390X

Intro

The GeForce GTX 660 has a GPU core speed of 980 MHz, and the 2048 MB of GDDR5 memory is set to run at 1502 MHz through a 192-bit bus. It also is comprised of 960 Stream Processors, 80 Texture Address Units, and 24 ROPs.

Compare all that to the Radeon R9 M390X, which has a core clock speed of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
GeForce GTX 660 140 Watts
Difference: 15 Watts (12%)

Memory Bandwidth

Theoretically, the Radeon R9 M390X should perform a little bit faster than the GeForce GTX 660 in general. (explain)

Radeon R9 M390X 160000 MB/sec
GeForce GTX 660 144192 MB/sec
Difference: 15808 (11%)

Texel Rate

The Radeon R9 M390X will be a small bit (more or less 18%) better at anisotropic filtering than the GeForce GTX 660. (explain)

Radeon R9 M390X 92544 Mtexels/sec
GeForce GTX 660 78400 Mtexels/sec
Difference: 14144 (18%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 660 is superior to the Radeon R9 M390X, but not by far. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon R9 M390X 23136 Mpixels/sec
Difference: 384 (2%)

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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GeForce GTX 660

Amazon.com

Check prices at:

Radeon R9 M390X

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 GeForce GTX 660 Radeon R9 M390X
Manufacturer nVidia AMD
Year September 2012 2015
Code Name GK106 Tonga
Memory 2048 MB 4096 MB
Core Speed 980 MHz 723 MHz
Memory Speed 6008 MHz 5000 MHz
Power (Max TDP) 140 watts 125 watts
Bandwidth 144192 MB/sec 160000 MB/sec
Texel Rate 78400 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 960 2048
Texture Mapping Units 80 128
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2540 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 12
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the 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 in one second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). 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 maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 660

Amazon.com

Check prices at:

Radeon R9 M390X

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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