5 minute should be enough ...
I should have written Im buying entirely new rig so I will have to install every hardware software firmware updates and all that and overclock test stabilty change thermal compound cooling and everything else.
How much do you think this wil take in worst situation?Okay lets say you buy A rig. a never ever ever ever do new firmware unless you have absolute certainty that:
A) you need the firmware
B) others have followed the firmware upgrade and it is proven to work
Next why do you want to overclock?
I ask this because you have asked a lot of questions about overclocking gpu's > I won't get into that gpu's do not work well for mining BTC.
I will say this Overclocking kills off gear------------- more true then not true.
also Overclocking eats up power many times overclocking loses money double the watts for 10 percent hash gain.