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Differences What are the advantages of each

Front view of GeForce GTX 750 Ti

Reasons to consider the
Nvidia GeForce GTX 750 Ti

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Much higher clock speed 1,020 MHz vs 648 MHz More than 55% higher clock speed
Better passmark score 3,689 vs 1,266 Around 3x better passmark score
Significantly higher effective memory clock speed 5,400 MHz vs 2,484 MHz Around 2.2x higher effective memory clock speed
More memory 2,048 MB vs 1,024 MB 2x more memory
Better floating-point performance 1,728 GFLOPS vs 708.5 GFLOPS Around 2.5x better floating-point performance
Higher texture rate 82.64 GTexel/s vs 51.8 GTexel/s Around 60% higher texture rate
Higher memory clock speed 1,502 MHz vs 1,242 MHz More than 20% higher memory clock speed
More shading units 640 vs 240 400 more shading units
Front view of GeForce GTX 285

Reasons to consider the
Nvidia GeForce GTX 285

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Higher memory bandwidth 159 GB/s vs 86.4 GB/s Around 85% higher memory bandwidth
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus
More render output processors 32 vs 16 Twice as many render output processors
More texture mapping units 80 vs 40 Twice as many texture mapping units

Benchmarks Real world tests of GeForce GTX 750 Ti vs 285

Passmark Industry standard benchmark for overall graphics card performance

Features Key features of the GeForce GTX 750 Ti  vs 285 

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

GeForce GTX 750 Ti
86.4 GB/s
GeForce GTX 285
159 GB/s
I also found memory overclocking on our sample to be quite limited, worse than other GTX 750 Ti cards using the same memory chips.
GeForce GTX 750 Ti | by techPowerUp!

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

GeForce GTX 750 Ti
16.32 GPixel/s
GeForce GTX 285
20.7 GPixel/s
So take NVIDIA's improvements today and factor in the additional improvements from a 20 nm production process and we could see a new breed of high-end GPUs from the company that uses less power than existing mid-range GPUs today (think of a 100 W Titan).
GeForce GTX 750 Ti | by techPowerUp!

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

GeForce GTX 750 Ti
82.64 GTexel/s
GeForce GTX 285
51.8 GTexel/s
Normally you'd just increase clocks until the card becomes unstable; now, you have to carefully go up in steps, measuring performance every time to find out where the drop occurs.
GeForce GTX 750 Ti | by techPowerUp!

floating point performance How fast the gpu can crunch numbers

GeForce GTX 750 Ti
1,728 GFLOPS
GeForce GTX 285
708.5 GFLOPS

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

Despite these few leaked pictures, we still do not have precise specifications for the upcoming R9 285 graphics card as it is still not clear if it will have 1792 or 2048 Stream Processors.
GeForce GTX 285 | by Slobodan-Simic (Aug, 2014)

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

The GM107 hence features a total of 640 CUDA cores and 48 TMUs.
GeForce GTX 750 Ti | by techPowerUp!

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