the board has very limited overclocking functions and like most h series boards is probably locked at 1.2v vcore max, which wont be enough for 4,8ghz unless you get super lucky in lottery and get one of the top 2% of these chips that could actually do 4,8ghz under 1,2 v most will need more than 1,3vcore, mine needs 1,4v vcore for 4,7 and nothing i do can get it stable at 4.8 so yeah best option is going for z87 or z97 board