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GeForce GTX 660 Ti vs Radeon HD 6870

Intro

The GeForce GTX 660 Ti features core clock speeds of 915 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 memory. It features 1344 SPUs as well as 112 TAUs and 24 Rasterization Operator Units.

Compare that to the Radeon HD 6870, which has GPU core speed of 900 MHz, and 1024 MB of GDDR5 memory running at 1050 MHz through a 256-bit bus. It also is made up of 1120 Stream Processors, 56 Texture Address Units, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

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

The GeForce GTX 660 Ti should in theory perform a bit faster than 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 should be much (about 103%) faster with regards to anisotropic filtering 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 is much (approximately 31%) faster with regards to AA than the GeForce GTX 660 Ti, and also able to handle higher resolutions better. (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

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

Model GeForce GTX 660 Ti Radeon HD 6870
Manufacturer nVidia AMD
Year August 2012 October 2010
Code Name GK104 Barts XT
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe x16
Memory 2048 MB 1024 MB
Core Speed 915 MHz 900 MHz
Shader Speed 915 MHz (N/A) MHz
Memory Speed 1500 MHz (6000 MHz effective) 1050 MHz (4200 MHz effective)
Unified Shaders 1344 1120
Texture Mapping Units 112 56
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1
Power (Max TDP) 150 watts 151 watts
Shader Model 5.0 5.0
Bandwidth 144000 MB/sec 134400 MB/sec
Texel Rate 102480 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 28800 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling 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 the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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