i have that ram in my z77 sabertooth. it runs fine. the issue with mb vendors is check the last date of the qa update most times the toss the ram guild up when the mb comes out and that it. sometime you have to email there tech supprt and ask for an updated ram list. or look on the ram vendor web page. http://www.gskill.com/products.php?index=422
the issue with ram today is most ram sellers buy on the spot market. you can have the same ram one with samsung ram that cl9 one month and the next there binning same part number with another ram vender ram.