hi regarding the motherboard ram frequency of 1333 as an overclock. is it ok if I use a hyper x fury single 8gb ddr3 with freq

[Hannibalz]

Asus P5g41c-M Lx compatibility with Kingston ddr3 hyper x fury 8gb single dimm with frequency range of 1333 to 1866mhz.

 

[cin19]

There are two problems for your PC RAM upgrading.
1) The MB can support 8GB for 2 x DIMM, so you need buy the 2X4GB kit, but not the single 8GB. https://www.asus.com/Motherboards/P5G41CM_LX/specifications/
2) The Kingston ddr3 hyper x fury RAM does not support your MB, they only can support H61, H67, or newer one.

You may try the crucial memory finder like that. http://www.crucial.com/usa/en/memory-info?cm_re=top-nav-_-flyout-memory-_-us-memory