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GeForce GTX 480 vs GeForce GTX 660

Intro

The GeForce GTX 480 has a GPU core clock speed of 700 MHz, and the 1536 MB of GDDR5 RAM runs at 924 MHz through a 384-bit bus. It also features 480 SPUs, 60 Texture Address Units, and 48 Raster Operation Units.

Compare that to the GeForce GTX 660, which comes with GPU clock speed of 980 MHz, and 2048 MB of GDDR5 memory running at 1502 MHz through a 192-bit bus. It also is comprised 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 480 250 Watts
Difference: 110 Watts (79%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 480 will be 23% faster than the GeForce GTX 660 in general, because of its higher bandwidth. (explain)

GeForce GTX 480 177408 MB/sec
GeForce GTX 660 144192 MB/sec
Difference: 33216 (23%)

Texel Rate

The GeForce GTX 660 will be a lot (about 87%) more effective at anisotropic filtering than the GeForce GTX 480. (explain)

GeForce GTX 660 78400 Mtexels/sec
GeForce GTX 480 42000 Mtexels/sec
Difference: 36400 (87%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 480 is superior to the GeForce GTX 660, by a large margin. (explain)

GeForce GTX 480 33600 Mpixels/sec
GeForce GTX 660 23520 Mpixels/sec
Difference: 10080 (43%)

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 480

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 480 GeForce GTX 660
Manufacturer nVidia nVidia
Year March 2010 September 2012
Code Name GF100 GK106
Memory 1536 MB 2048 MB
Core Speed 700 MHz 980 MHz
Memory Speed 3696 MHz 6008 MHz
Power (Max TDP) 250 watts 140 watts
Bandwidth 177408 MB/sec 144192 MB/sec
Texel Rate 42000 Mtexels/sec 78400 Mtexels/sec
Pixel Rate 33600 Mpixels/sec 23520 Mpixels/sec
Unified Shaders 480 960
Texture Mapping Units 60 80
Render Output Units 48 24
Bus Type GDDR5 GDDR5
Bus Width 384-bit 192-bit
Fab Process 40 nm 28 nm
Transistors 3000 million 2540 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.0
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 amount of texture map elements (texels) that can be applied per 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 the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number 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 outputting the pixels (image) to the screen. The actual pixel output 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 maximum fill rate.

Comments

2 Responses to “GeForce GTX 480 vs GeForce GTX 660”
Help! I need a new graphics card. says:

[...] £178.39. Looks like a nice graphics card at not an unreasonable price. Comparing the two, using: HWCompare I am not sure my motherboard can cope & would support the GTX 660's Bus requirement: [...]

DasPootisXD says:

I have money for either one and I need help on deciding on which one I should buy. Other question is: what use is texel rate and how important it is?

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