In terms of FPS and all that, absolutely none. Its all down to the clock speeds, if they are identical they will perform the same.
As for cooling, there would be a difference but I wouldn't think much. Will have to look up comparisons between the models to tell which is better.
I would go for the Top it's been proven it's the best!The Asus TOP have been out for a while. Though the issues were corrected, they have not restocked them yet. Also, the non top models are locked. TechPowerUp rates the Asus GTX 670 DirectCU II TOP 10.0 the first card ever to receive a perfect 10 Quote: Yes, you've seen correctly, the ASUS GeForce GTX 670 Direct CU II TOP is the first graphics card ever that I gave a perfect ten score. The stock GeForce GTX 670 provides already great performance, but ASUS has topped that by boosting it with a large overclock out of the box which catapults it beyond GTX 680 performance levels. Averaged over all our testing we see the card 1% faster than GTX 680 and 8% faster than GTX 670. The card does so without massive power consumption increase thanks to an efficient VRM design and low temperatures. ASUS has done away with NVIDIA's cheap voltage regulation circuitry and put a much better CHiL controller on the card, which also supports voltage control and monitoring.
The ASUS DC II cooler is a revelation on the GTX 670, it provides incredibly low noise levels. In both idle and load the card emits almost no noise, it is actually quieter under full load than most other cards on the market are at idle. Not only noise is low but temperatures are great, too. With only 74°C under load the card is cooler than most other GTX 670 cards tested today.
Manual overclocking works well too, especially memory, which is not overclocked out of the box, performs exceedingly well. We see well over 100 MHz extra memory overclocking potential compared to the NVIDIA reference design, thanks to the revamped PCB design. In the end the card reaches 1890 MHz memory, which is just 5 MHz shy of the highest memory clock ever recorded in a TPU review.
Overall the ASUS GTX 670 Direct CU II is the best card I ever tested. I simply can't find anything wrong with it. ASUS has sucessfully addressed all the shortcomings of NVIDIA's reference design, yet asks only a moderate $20 price premium for their card. This means that you can get faster than GTX 680 performance at $420. And the card manages all that with a dual slot cooler, that just screams "put me in SLI". http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_670... So the main 2 brands to go for are MSI PE, EVGA FTW MSI's GTX 670 Power Edition uses the famous Twin Frozr IV cooler from the MSI Lightning and comes with a large clock speed boost out of the box, making its default clock speed even higher than GTX 680 stock clocks.That would be a solid choice for the price imo they currently are going for $389.99 a piece that doesn't look unreasonable, given the improved cooling and higher clocks but it's up to you. Here are professional reliable reviews if your interested. http://www.hardwarecanucks.com/forum/hardware-canucks-r... http://www.guru3d.com/article/msi-geforce-gtx-670-power... http://www.hardwareheaven.com/reviews.php?reviewid=1553... http://www.fudzilla.com/home/item/27432-evga-gtx-670-ft...