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GeForce GTX 660 Ti vs Radeon HD 6870

Intro

The GeForce GTX 660 Ti features core 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 Rasterization Operator Units.

Compare those specs to the Radeon HD 6870, which has GPU clock speed of 900 MHz, and 1024 MB of GDDR5 memory set to run at 1050 MHz through a 256-bit bus. It also 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

In theory, the GeForce GTX 660 Ti should be 7% faster than the Radeon HD 6870 in general, because of its greater data rate. (explain)

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

Texel Rate

The GeForce GTX 660 Ti should be a lot (about 103%) more effective 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 6870 is a better choice, and very much so. (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

GeForce GTX 660 Ti

Radeon HD 6870

Specifications

Display Specifications

Hide Specifications

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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at 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 card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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.

GeForce GTX 660 Ti

Radeon HD 6870

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