Re: Is it usefull to use a certain DNS?
I use OpenDNS as they are more secure than the ISP's.
Keep in mind that DNS servers won't make your internet connection any faster or slower. If it takes an hour to download a linux distro, changing DNS settings won't have any effect on that. A faster DNS server will resolve requests faster which would make the internet feel snappier, it won't turn DSL into fiber optic.
FX-8350 @ 4.7 cooled by H80, 32GB Mushkin Enhanced Blackline 2133, Asus Sabertooth 990FX, 2x Radeon HD 7850 2GB in X-fire, 500GB Samsung 850 Evo, 4TB Seagate, 3TB WD Black, 2x 1TB WD RED in RAID 0