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GeForce GTX 275 vs GeForce GTX 660

Intro

The GeForce GTX 275 has a GPU core clock speed of 633 MHz, and the 896 MB of GDDR3 memory is set to run at 1134 MHz through a 448-bit bus. It also features 240 SPUs, 80 TAUs, and 28 Raster Operation Units.

Compare all of that to the GeForce GTX 660, which features core speeds of 980 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 RAM. 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

Performance-wise, the GeForce GTX 660 should theoretically be a little bit superior to the GeForce GTX 275 overall. (explain)

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

Texel Rate

The GeForce GTX 660 will be quite a bit (approximately 55%) more effective 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

The GeForce GTX 660 will be quite a bit (approximately 33%) more effective at FSAA than the GeForce GTX 275, and also will be able to handle higher screen resolutions without losing too much performance. (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: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher 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 maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max 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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