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GeForce GTX 660 Ti vs Radeon HD 3870 X2 1GB

Intro

The GeForce GTX 660 Ti comes with a clock frequency of 915 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 192-bit memory bus, and uses a 28 nm design. It is comprised of 1344 SPUs, 112 TAUs, and 24 ROPs.

Compare that to the Radeon HD 3870 X2 1GB, which features a clock frequency of 825 MHz and a GDDR4 memory speed of 1126 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It features 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 3870 X2 1GB should in theory be a bit superior to the GeForce GTX 660 Ti in general. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
GeForce GTX 660 Ti 144000 MB/sec
Difference: 128 (0%)

Texel Rate

The GeForce GTX 660 Ti will be quite a bit (approximately 288%) better at texture filtering than the Radeon HD 3870 X2 1GB. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 76080 (288%)

Pixel Rate

The Radeon HD 3870 X2 1GB will be just a bit (more or less 20%) more effective at full screen anti-aliasing than the GeForce GTX 660 Ti, and also should be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
GeForce GTX 660 Ti 21960 Mpixels/sec
Difference: 4440 (20%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GTX 660 Ti

Amazon.com

Check prices at:

Radeon HD 3870 X2 1GB

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 660 Ti Radeon HD 3870 X2 1GB
Manufacturer nVidia AMD
Year August 2012 Jan 28, 2008
Code Name GK104 R680
Memory 2048 MB 1024 MB (x2)
Core Speed 915 MHz 825 MHz (x2)
Memory Speed 6000 MHz 2252 MHz (x2)
Power (Max TDP) 150 watts (Unknown) watts
Bandwidth 144000 MB/sec 144128 MB/sec
Texel Rate 102480 Mtexels/sec 26400 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 26400 Mpixels/sec
Unified Shaders 1344 320(64x5) (x2)
Texture Mapping Units 112 16 (x2)
Render Output Units 24 16 (x2)
Bus Type GDDR5 GDDR4
Bus Width 192-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors 3540 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 2.0 x16/(internal PCIe 1.1 x16)
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.3 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GTX 660 Ti

Amazon.com

Check prices at:

Radeon HD 3870 X2 1GB

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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