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Differences What are the advantages of each

Front view of GeForce GTX 760 Ti

Reasons to consider the
Nvidia GeForce GTX 760 Ti

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Higher memory bandwidth 192.3 GB/s vs 144.2 GB/s Around 35% higher memory bandwidth
More render output processors 32 vs 24 8 more render output processors
Wider memory bus 256 bit vs 192 bit Around 35% wider memory bus
Front view of GeForce GTX 660 Ti

Reasons to consider the
Generic GeForce GTX 660 Ti

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Higher turbo clock speed 980 MHz vs 950 MHz Around 5% higher turbo clock speed

Features Key features of the GeForce GTX 760 Ti  vs 660 Ti 

memory bandwidth Rate at which data can be read from or stored in onboard memory

GeForce GTX 760 Ti
192.3 GB/s
GeForce GTX 660 Ti
144.2 GB/s
The memory bus is narrower by 25%, resulting in a memory bandwidth of 144 GB/s (against 192 GB/s on the GTX 670).
GeForce GTX 660 Ti | by techPowerUp! (Aug, 2012)

pixel rate Number of pixels a graphics card can render to the screen every second

GeForce GTX 760 Ti
25.9 GPixel/s
GeForce GTX 660 Ti
25.6 GPixel/s
At that price the card easily beats AMD's HD 7950 in all important criteria: performance, power, noise, heat, performance per Dollar, and performance per Watt.
GeForce GTX 660 Ti | by techPowerUp! (Aug, 2012)

texture rate Speed at which a graphics card can perform texture mapping

GeForce GTX 760 Ti
103.6 GTexel/s
GeForce GTX 660 Ti
102.5 GTexel/s
We benchmarked using the highest settings possible in DirectX 11 mode, which was added via a patch after release.
GeForce GTX 660 Ti | by techPowerUp! (Aug, 2012)

floating point performance How fast the gpu can crunch numbers

GeForce GTX 760 Ti
2,486 GFLOPS
GeForce GTX 660 Ti
2,460 GFLOPS
It makes use of Bethesda's Creation Engine which isn't visually intensive in that it doesn't use taxing graphics features.
GeForce GTX 660 Ti | by techPowerUp! (Aug, 2012)

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

What you're going to see in the benchmarks is that some workloads tend to favor shader count, others react to the GPU's clock rate, and a third group enjoys memory bandwidth.
GeForce GTX 760 Ti | by Chris-Angelini (Jun, 2013)

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

It looks like more are yet to come since a leaked GPU-Z shot unveils a brand new yet cut down GK110 part known as the GeForce GTX 770 Ti consisting of 1920 Cuda Cores, 160 TMUs and 48 ROPs.
GeForce GTX 760 Ti | by hassan-mujtaba (Sep, 2013)

Specifications Full list of technical specs

gpu

GeForce GTX 760 Ti  vs
660 Ti 
GPU brand Nvidia Nvidia
GPU name GK114 GK104
Market Desktop Desktop
Clock speed 925 MHz 915 MHz
Turbo clock speed 950 MHz 980 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GTX 660 Ti 915 MHz 2 GB

raw performance

Shading units 1,344 1,344
Texture mapping units 112 112
Render output processors 32 24
SMX units 7 7
Pixel rate 25.9 GPixel/s 25.6 GPixel/s
Texture rate 103.6 GTexel/s 102.5 GTexel/s
Floating-point performance 2,486 GFLOPS 2,460 GFLOPS

memory

GeForce GTX 760 Ti  vs
660 Ti 
Memory clock speed 1,502 MHz 1,502 MHz
Effective memory clock speed 6,008 MHz 6,008 MHz
Memory bus 256 bit 192 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 192.3 GB/s 144.2 GB/s

noise and power

TDP 170W 150W

Comments

Showing 4 comments.
We wanted to show what how the rumoured specs of the 760ti stack up to other GPUs people might be interested in. Once it's released, this page will actually be a lot more comprehensive and will show benchmark performance done through testing, as well as any other data about the graphics card that's not yet available. Good point about showing its a rumoured card though. We show that the 760ti is rumoured on its individual page here: http://gpuboss.com/graphics-card/GeForce-GTX-760-Ti but we could maybe do a better job of that on this comparison page.
you do realise the 760ti hasnt been released yet so this comparison is just based on rumors. Further u wil also be able to overclock the 760 and with its wider mem bus it wil beat the 660ti.
But they havent started playing about with the drivers and stuff yet.
seems like you can OC a 660TI to be just as good as a 760 TI..
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