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GeForce GTX 275 vs GeForce GTX 660

Intro

The GeForce GTX 275 comes with a GPU core speed of 633 MHz, and the 896 MB of GDDR3 memory runs at 1134 MHz through a 448-bit bus. It also is made up of 240 SPUs, 80 TAUs, and 28 ROPs.

Compare all that to the GeForce GTX 660, which has a clock speed of 980 MHz and a GDDR5 memory speed of 1502 MHz. It also features a 192-bit bus, and uses a 28 nm design. It features 960 SPUs, 80 Texture Address Units, and 24 ROPs.

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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

Theoretically, the GeForce GTX 660 should perform just a bit faster than 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%) more effective at anisotropic filtering 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 is quite a bit (about 33%) better at FSAA than the GeForce GTX 275, and also capable of handling higher resolutions while still performing well. (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

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GeForce GTX 660

Amazon.com

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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 (in units of megabytes per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach 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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