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GeForce GTX 275 vs GeForce GTX 660

Intro

The GeForce GTX 275 has clock speeds of 633 MHz on the GPU, and 1134 MHz on the 896 MB of GDDR3 RAM. It features 240 SPUs as well as 80 Texture Address Units and 28 ROPs.

Compare those specs to the GeForce GTX 660, which uses a 28 nm design. nVidia has clocked the core speed at 980 MHz. The GDDR5 memory works at a frequency of 1502 MHz on this card. It features 960 SPUs as well as 80 Texture Address Units and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
GeForce GTX 275 219 Watts
Difference: 79 Watts (56%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 should theoretically be a bit superior to the GeForce GTX 275 in general. (explain)

GeForce GTX 660 144192 MB/sec
GeForce GTX 275 127008 MB/sec
Difference: 17184 (14%)

Texel Rate

The GeForce GTX 660 is much (about 55%) better at AF than the GeForce GTX 275. (explain)

GeForce GTX 660 78400 Mtexels/sec
GeForce GTX 275 50640 Mtexels/sec
Difference: 27760 (55%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 660 is the winner, by far. (explain)

GeForce GTX 660 23520 Mpixels/sec
GeForce GTX 275 17724 Mpixels/sec
Difference: 5796 (33%)

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 275

Amazon.com

Check prices at:

GeForce GTX 660

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 275 GeForce GTX 660
Manufacturer nVidia nVidia
Year April 9, 2009 September 2012
Code Name G200b GK106
Memory 896 MB 2048 MB
Core Speed 633 MHz 980 MHz
Memory Speed 2268 MHz 6008 MHz
Power (Max TDP) 219 watts 140 watts
Bandwidth 127008 MB/sec 144192 MB/sec
Texel Rate 50640 Mtexels/sec 78400 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 23520 Mpixels/sec
Unified Shaders 240 960
Texture Mapping Units 80 80
Render Output Units 28 24
Bus Type GDDR3 GDDR5
Bus Width 448-bit 192-bit
Fab Process 55 nm 28 nm
Transistors 1400 million 2540 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.1 OpenGL 4.3

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant 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 maximum fill rate.

Display Prices

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GeForce GTX 275

Amazon.com

Check prices at:

GeForce GTX 660

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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