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GeForce GTX 260 vs GeForce GTX 660

Intro

The GeForce GTX 260 comes with clock speeds of 576 MHz on the GPU, and 999 MHz on the 896 MB of GDDR3 RAM. It features 192 SPUs along with 64 Texture Address Units and 28 Rasterization Operator Units.

Compare those specifications to the GeForce GTX 660, which has a clock speed of 980 MHz and a GDDR5 memory speed of 1502 MHz. It also makes use of a 192-bit memory bus, and uses a 28 nm design. It is made up of 960 SPUs, 80 TAUs, and 24 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
GeForce GTX 260 182 Watts
Difference: 42 Watts (30%)

Memory Bandwidth

Theoretically, the GeForce GTX 660 should be quite a bit faster than the GeForce GTX 260 in general. (explain)

GeForce GTX 660 144192 MB/sec
GeForce GTX 260 111888 MB/sec
Difference: 32304 (29%)

Texel Rate

The GeForce GTX 660 will be much (about 113%) better at AF than the GeForce GTX 260. (explain)

GeForce GTX 660 78400 Mtexels/sec
GeForce GTX 260 36864 Mtexels/sec
Difference: 41536 (113%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 660 is the winner, and very much so. (explain)

GeForce GTX 660 23520 Mpixels/sec
GeForce GTX 260 16128 Mpixels/sec
Difference: 7392 (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

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GeForce GTX 260

Amazon.com

GeForce GTX 660

Amazon.com

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 260 GeForce GTX 660
Manufacturer nVidia nVidia
Year June 16, 2008 September 2012
Code Name G200 GK106
Memory 896 MB 2048 MB
Core Speed 576 MHz 980 MHz
Memory Speed 1998 MHz 6008 MHz
Power (Max TDP) 182 watts 140 watts
Bandwidth 111888 MB/sec 144192 MB/sec
Texel Rate 36864 Mtexels/sec 78400 Mtexels/sec
Pixel Rate 16128 Mpixels/sec 23520 Mpixels/sec
Unified Shaders 192 960
Texture Mapping Units 64 80
Render Output Units 28 24
Bus Type GDDR3 GDDR5
Bus Width 448-bit 192-bit
Fab Process 65 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 largest amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's 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 figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Comments

One Response to “GeForce GTX 260 vs GeForce GTX 660”
GTX 260 versus GTX 660 - Hardware Canucks says:

[...] GeForce GTX 260 vs GeForce GTX 660 – Performance Comparison Benchmarks @ Hardware Compare 30% only more memory bandwith :P [...]

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