The answer is simple, GTX 670/680 DirectCU II was born TOP, a video card generous in every respect. With high performance. ASUS is set to make inroads into the hearts of hardcore overclockers thanks to a generous factory overclock and quality components designed to increase the frequency. I would be all over that Asus TOP for its high factory overclock, cool temps, and really, really quiet fans,heavily modified PCB, with an efficient VRM design to produce low temperatures, improved voltage regulation circuitry, much better Chil controller , specially binned chip and voltage control and monitoring support that you won't find on most other non-reference cards.
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. MSI is asking a $359.99 price for their card, which doesn't look unreasonable, given the improved cooling and higher clocks.I own this card here it is in action http://www.youtube.com/watch?v=BnLUJxCBZUg&feature=plcp
Ever since Intel’s introduction of the Z77 chipset, motherboard giant Gigabyte has made huge leaps in in improvements on their motherboards all the way from the budget end to the extreme high end and the Z77X-D3H is a perfect example of what kind of top quality products can be achieved.
With support for PCIe 3.0, SATA 3 6Gb/s, 8 channel integrated audio, Gigabyte’s fully digital power delivery system, and ultra durable 4 features, it’s got a lot going for it.
The GIGABYTE GTX 670 OC is one of GIGABYTE’s overclocked video cards in the GeForce GTX 600 series lineup. It includes GIGABYTE’s Windforce 3X cooling solution and a factory overclock. NVIDIA’s reference GTX 670 platform has the base GPU clock speed set to 915MHz on the core, while GIGABYTE starts their offering out at 980MHz.