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GeForce GTX 260 vs GeForce GTX 660

Intro

The GeForce GTX 260 comes with a GPU clock speed of 576 MHz, and the 896 MB of GDDR3 memory runs at 999 MHz through a 448-bit bus. It also is comprised of 192 Stream Processors, 64 TAUs, and 28 ROPs.

Compare that to the GeForce GTX 660, which features a GPU core clock speed of 980 MHz, and 2048 MB of GDDR5 memory running at 1502 MHz through a 192-bit bus. It also is made up of 960 Stream Processors, 80 TAUs, 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 260 182 Watts
Difference: 42 Watts (30%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 should be 29% quicker than the GeForce GTX 260 overall, because of its greater bandwidth. (explain)

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

Texel Rate

The GeForce GTX 660 should be a lot (about 113%) better at texture filtering than the GeForce GTX 260. (explain)

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

Pixel Rate

The GeForce GTX 660 is quite a bit (about 46%) faster with regards to full screen anti-aliasing than the GeForce GTX 260, and should be capable of handling higher screen resolutions better. (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 max amount of information (in units of MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially 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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