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GeForce GTX 660 Ti vs Radeon R9 M390X

Intro

The GeForce GTX 660 Ti has core speeds of 915 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 memory. It features 1344 SPUs along with 112 TAUs and 24 Rasterization Operator Units.

Compare that to the Radeon R9 M390X, which comes with a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also features 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
GeForce GTX 660 Ti 150 Watts
Difference: 25 Watts (20%)

Memory Bandwidth

In theory, the Radeon R9 M390X will be 11% faster than the GeForce GTX 660 Ti overall, due to its greater data rate. (explain)

Radeon R9 M390X 160000 MB/sec
GeForce GTX 660 Ti 144000 MB/sec
Difference: 16000 (11%)

Texel Rate

The GeForce GTX 660 Ti is a bit (approximately 11%) more effective at anisotropic filtering than the Radeon R9 M390X. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon R9 M390X 92544 Mtexels/sec
Difference: 9936 (11%)

Pixel Rate

The Radeon R9 M390X will be a little bit (about 5%) better at full screen anti-aliasing than the GeForce GTX 660 Ti, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 M390X 23136 Mpixels/sec
GeForce GTX 660 Ti 21960 Mpixels/sec
Difference: 1176 (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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GeForce GTX 660 Ti

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 Ti Radeon R9 M390X
Manufacturer nVidia AMD
Year August 2012 2015
Code Name GK104 Tonga
Memory 2048 MB 4096 MB
Core Speed 915 MHz 723 MHz
Memory Speed 6000 MHz 5000 MHz
Power (Max TDP) 150 watts 125 watts
Bandwidth 144000 MB/sec 160000 MB/sec
Texel Rate 102480 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 1344 2048
Texture Mapping Units 112 128
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 3540 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: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better 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 maximum number of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce GTX 660 Ti

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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