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GeForce GTX 660 Ti vs Radeon HD 6870

Intro

The GeForce GTX 660 Ti features clock speeds of 915 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 memory. It features 1344 SPUs along with 112 TAUs and 24 ROPs.

Compare those specifications to the Radeon HD 6870, which has a clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1120 SPUs, 56 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti 150 Watts
Radeon HD 6870 151 Watts
Difference: 1 Watts (1%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 Ti should in theory be a small bit superior to the Radeon HD 6870 overall. (explain)

GeForce GTX 660 Ti 144000 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 9600 (7%)

Texel Rate

The GeForce GTX 660 Ti is a lot (more or less 103%) better at AF than the Radeon HD 6870. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 52080 (103%)

Pixel Rate

The Radeon HD 6870 will be much (more or less 31%) more effective at anti-aliasing than the GeForce GTX 660 Ti, and capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 6870 28800 Mpixels/sec
GeForce GTX 660 Ti 21960 Mpixels/sec
Difference: 6840 (31%)

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 660 Ti

Amazon.com

Radeon HD 6870

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 660 Ti Radeon HD 6870
Manufacturer nVidia AMD
Year August 2012 October 2010
Code Name GK104 Barts XT
Memory 2048 MB 1024 MB
Core Speed 915 MHz 900 MHz
Memory Speed 6000 MHz 4200 MHz
Power (Max TDP) 150 watts 151 watts
Bandwidth 144000 MB/sec 134400 MB/sec
Texel Rate 102480 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 1344 1120
Texture Mapping Units 112 56
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 3540 million 1700 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the 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 are applied per second. This figure 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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