You might be thinking of over volting or over clocking. http://www.tomshardware.com/answers/id-2139079/asus-z97-motherboards-official-support-thread.html has a note about supported ram lists.
I trying to build a pc but are quite confused with which Ram i should have.
My build as below:
Intel Core i7-4790K 4.0GHz Quad-Core Processor
Thermaltake Versa H23 ATX Mid Tower Case
Please advise the best Ram for this build