Unless you are having issues with your internet connection on your PS3 I would reconmend leaving your DNS settings as is. Only if you are having login issues or see "server not found" errors would you want to try this.
If you have a router, chances are it's acting as the DNS server and is going to be considerably faster than using OpenDNS DNS servers. In my experiance these things are usually more congested and have a higher latency times than the DNS server provided by your ISP.
hey bro, so i know how to most stuff except for the default router ip thing. so please help! where do i locate it. i have att uverse internet btw. and hope to get some help thx
I just googled it:
Launch a web browser from any computer already connected to the network. The connection will preferably be via Ethernet cable attached to the gateway.
Type "192.168.1.254" in the address bar and press Enter. If asked for a password, use the wireless network key found on the sticker on your U-Verse router.
This should be your routers ip.