Can someone that has the asus sabertooth 990fx tell the pros and cons?
The Sabertooth R 2.0 is very good, supports PCI E 3.0 x16/x16 for SLI and Xfire setups, which is great. Other than that it's just a solid board. Looks aesthetically sleek and stealthy.
it overclocks like a beast i know that
No real cons.
Outstanding component quality
Digital Controller for the CPU, VRM and DRAM this great for improve flexibility at tuning and overclocking the board and ensuring stability
Great feature set outside of the improve VRM components or extra validation. Due to the validation and component quality also offers a 5 year warranty.
Compared to the Crosshair Formula Z
It does not have
SupremeFX isolated audio design
3 Way SLI Support
There are a few other items as well but they are specific to enthusiasts or users really look for special features and functions.
Both have great build quality, rich and functionality UEFI's which are mature and optimized this is important for compatibility and overclocking which board will offer the same experience.
In the end you cannot go wrong with either board just depends on the features and functions you are looking.