Hey how do you up a 2.4/5 ghz dual band router up to 5ghz? I just bought this and my ps3 is still laggy.

It is not possible to connect your PC to 5 GHz network. Its wireless card has no capability for 5 GHz band. See this answer for similar question:
Get 5Ghz on laptop

You can buy additional Wi-Fi adapter supporting 802.11a/b/g/n or 802.11ac standard.
Dual band adapter example is here:
WiFi AC Adapter Dongle GMYLE Wireless AC1200 Dual Band 802 11ac USB3 0 866...

Find and check a wireless network label or sticker on your laptop. The Wi-Fi standard is written there. It indicates which capability your wireless card has.

• 802.11b/g/n (or "bgn") --> your card supports 2.4 GHz band only. There is no way to activate 5 GHz without you buy new "Wi-Fi stick" having 5 GHz support.
• 802.11a/b/g/n (or "abgn" or "abg") or 802.11ac --> your card is 5 GHz capable. Only laptop card setting change should be needed to enable 5 GHz radio.

The "a" means the 5 GHz.

For wireless standard logo types see a picture on this link:
Wireless Ethernet 820 11a To 820 11g Network Basics Networking Basics LAN...

Use any dual-band cell phone (Samsung Galaxy S4, S5, S6...) and free WiFi Analyzer Android application to check your router is transmitting 5 GHz too (channels 34 and higher).

You must set it up. Give it a different SSID and Security Key.Try the user manual: http://www.belkin.com/networking/manual/MAN_F9K1103_8820-00778_RevA01_N750.pdf AND http://www.belkin.com/au/support-search?search=n750+db

i think the best thing to do would be to make sure your 5ghz router settings, make sure they haven't been altered, or reset.

If you need further help, reach me via phone at https://www.6ya.com/expert/joel_63c670a84e9f6a97

5 ghz is line of sight only so if the router is not in the same room you will not have much luck with the 5ghz band.

hey dude i have the solution for your answer
1>connect the computer to the router wired type http://192.168.2.1
2>on left side u can find wifi protected setup disable it for 2.4GHZ & 5 GHZ
3>now click on security - under 5ghz click on secuity mode - > disable security->apply changes
4>now for click security mode for 2.4 GHZ -SELECT 64 BIT WEP - ENTER 10 DIGIT NO AS PASSWORD APPLY CHANGES
5>CLICK CHANNEL & SSID ON LEFT SIDE UNDER WIRELES - >UNDER 2.4GHZ CHANG SSID TO ANY NAME U WISH APPLY CHANGES IT WIL WORK
LET ME KNW IF IT WORKS THANKS MILAN

This is NOT a DVD player. The Netgear RangeMax Dual Band Wireless-N Router WNDR3300 features a rather misleading name. The router doesn't support true dual-band wireless-N, nor does it offer very good range. It's a basic router with two separate access points (AP), one of which supports Wireless-N and can operate in either 2.4GHz or 5GHz frequencies--similar to the D-Link DGL-4500--while the other is a regular 802.11G 2.4GHz-only AP. The result is that when in dual-band mode the router is able to offer Wireless-N only in the 5Ghz frequency, while the 2.4Ghz frequency is maxed out at the 802.11G speed. Still, if you have a growing stable of 5Ghz-based devices and want a router that supports both frequencies, the WNDR3300 is the cheapest router on the market (at about $100) that will suit your needs.

While its max throughput is relatively low, the router offered very consistent and considerably high throughput speeds on both our mixed-mode and long-range throughput tests. Unfortunately, its range is possibly the shortest among Wireless-N routers. If range is not important to you and your network primarily consists of 5GHz-based clients, the WNDR330 is a good bet. Otherwise, for the same price, we'd recommend the 2.4GHz-only Linksys WRT310N; or you can pay $50 more for the true dual-band Linksys WRT610n.

PS3 does not have a 5.0 ghz network card so it will only see the 2.4. I suspect your laptop also lacks the hardware for 5.0 ghz.

Does your router support the 5GHZ network?

My router supports dual-band at 2.4 and 5, and has separate SSIDs for each of them.

ie; network_1 = 2.4GHZ, network_2 = 5.0GHZ

So when I want the 5.0, I just connect to network_2

It's quite possible that though your wirelses adapter supports 5.0, that your router doesn't.

not sure how to change it from 2.4GHz to 5 GHz but I know the 802.11a = 5GHz
802.11b and g are 2.4GHz
and the 802.11 can be both 2.4 or 5GHz the information from master JC is not correct if i'm not mistaken