I was considering using the i7-5930K Haswell on the ASRock X99 WS LGA 2011-v3 motherboard, however, a reviewer at newegg stated that he ran into stability issues:
"There seems to be some stability issue between the memory and overclocking the CPU, even using preset OC setting through the bios. When the cpu is bumped up at all; the memory becomes unstable. As in locks the machine up. I can blame the motherboard, mem, or cpu, specifically, but it is disappointing the memory stability is an issue with a simple 1% cpu speed increase. I'm running Scientific Linux 6.5, so stability maybe better in Windows."
source:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Can anyone confirm this claim and/or suggest a potentially better motherboard for less than $350?