GeForce GTX 660 Ti vs Radeon HD 6770

Intro

The GeForce GTX 660 Ti uses a 28 nm design. nVidia has clocked the core speed at 915 MHz. The GDDR5 RAM is set to run at a frequency of 1500 MHz on this card. It features 1344 SPUs along with 112 Texture Address Units and 24 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6770, which uses a 40 nm design. ATi has clocked the core frequency at 900 MHz. The GDDR5 memory works at a speed of 1050 MHz on this card. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Price Comparison

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce GTX 660 Ti Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 6770 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce GTX 660 Ti	Radeon HD 6770
Manufacturer	nVidia	ATi
Year	August 2012	January 2011
Code Name	GK104	Juniper XT
Fab Process	28 nm	40 nm
Bus	PCIe 3.0 x16	PCIe x16
Memory	2048 MB	512 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	800
Texture Mapping Units	112	40
Render Output Units	24	16
Bus Type	GDDR5	GDDR5
Bus Width	192-bit	128-bit
DirectX Version	DirectX 11.1	DirectX 11
OpenGL Version	OpenGL 4.3	OpenGL 4.1
Power (Max TDP)	150 watts	108 watts
Shader Model	5.0	5.0
Bandwidth	144000 MB/sec	67200 MB/sec
Texel Rate	102480 Mtexels/sec	36000 Mtexels/sec
Pixel Rate	21960 Mpixels/sec	14400 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on 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 reach the maximum fill rate.