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GeForce GTX 660 Ti vs Radeon HD 7950

Intro

The GeForce GTX 660 Ti features a core clock speed of 915 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 192-bit bus, and makes use of a 28 nm design. It is made up of 1344 SPUs, 112 Texture Address Units, and 24 ROPs.

Compare those specifications to the Radeon HD 7950, which comes with a clock speed of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 384-bit memory bus, and uses a 28 nm design. It is comprised of 1792 SPUs, 112 TAUs, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti 150 Watts
Radeon HD 7950 200 Watts
Difference: 50 Watts (33%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 will be 67% quicker than the GeForce GTX 660 Ti overall, because of its greater bandwidth. (explain)

Radeon HD 7950 240000 MB/sec
GeForce GTX 660 Ti 144000 MB/sec
Difference: 96000 (67%)

Texel Rate

The GeForce GTX 660 Ti will be a little bit (approximately 14%) better at texture filtering than the Radeon HD 7950. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon HD 7950 89600 Mtexels/sec
Difference: 12880 (14%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7950 is the winner, but only just. (explain)

Radeon HD 7950 25600 Mpixels/sec
GeForce GTX 660 Ti 21960 Mpixels/sec
Difference: 3640 (17%)

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 7950

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 7950
Manufacturer nVidia AMD
Year August 2012 January 2012
Code Name GK104 Tahiti Pro
Memory 2048 MB 1536 MB
Core Speed 915 MHz 800 MHz
Memory Speed 6000 MHz 5000 MHz
Power (Max TDP) 150 watts 200 watts
Bandwidth 144000 MB/sec 240000 MB/sec
Texel Rate 102480 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1344 1792
Texture Mapping Units 112 112
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 3540 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 applied per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Comments

One Response to “GeForce GTX 660 Ti vs Radeon HD 7950”
Điểm danh các dòng GTX 660 của các hãng tại Việt Nam - Page 2 says:

[...] 7950 cả: Để bạn khỏi nói rằng mình chỉ dựa trên mỗi techpowerup thì đây link của Hardware Coparison và pic của tom's hardware Rất nhiều người chơi game res trên 1920x1080p đó [...]

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