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GeForce GTX 660 Ti vs Radeon R9 270X

Intro

The GeForce GTX 660 Ti has a GPU core speed of 915 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1500 MHz through a 192-bit bus. It also features 1344 SPUs, 112 TAUs, and 24 ROPs.

Compare that to the Radeon R9 270X, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory works at a frequency of 1400 MHz on this particular card. It features 1280 SPUs along with 80 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti 150 Watts
Radeon R9 270X 180 Watts
Difference: 30 Watts (20%)

Memory Bandwidth

Performance-wise, the Radeon R9 270X should theoretically be quite a bit better than the GeForce GTX 660 Ti overall. (explain)

Radeon R9 270X 179200 MB/sec
GeForce GTX 660 Ti 144000 MB/sec
Difference: 35200 (24%)

Texel Rate

The GeForce GTX 660 Ti is quite a bit (approximately 28%) more effective at texture filtering than the Radeon R9 270X. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon R9 270X 80000 Mtexels/sec
Difference: 22480 (28%)

Pixel Rate

The Radeon R9 270X is much (more or less 46%) more effective at AA than the GeForce GTX 660 Ti, and should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 270X 32000 Mpixels/sec
GeForce GTX 660 Ti 21960 Mpixels/sec
Difference: 10040 (46%)

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

GeForce GTX 660 Ti

Radeon R9 270X

Specifications

Display Specifications

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Model GeForce GTX 660 Ti Radeon R9 270X
Manufacturer nVidia AMD
Year August 2012 October 2013
Code Name GK104 Curacao XT
Memory 2048 MB 2048 MB
Core Speed 915 MHz 1000 MHz
Memory Speed 6000 MHz 5600 MHz
Power (Max TDP) 150 watts 180 watts
Bandwidth 144000 MB/sec 179200 MB/sec
Texel Rate 102480 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 1344 1280
Texture Mapping Units 112 80
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 3540 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

GeForce GTX 660 Ti

Radeon R9 270X

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