I want to warn you about Ghash.io multipool.
I use multipool.us wafflepool and other and never had problems with my farms.
However switched them to ghash.io once it went live and left for few days. Only to realize that 90% of shares were either duplicated or stale - and the customer support keep responding (it is a problem with your hardware)
Shame - cex.io customer support is a bunch of under trained guys knows a little about mining and different hardware.All they can do is maintenance their own simple bitcoin asics/fpgas etc.
Please consider twice before joining ghash.io multipool. I lost around £130 in electricity and haven't received even a penny as a refund!
Also withdrawal fees, conversion rates , lack of 90% of scrypt coins - very low switching time (mulitport) - really bad service
kind regards
Tom