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[eh?]

I recently bought a dlink 825 and it seems right out of the box the wired internet connection seems very poor. Wireless works fine but it on wired the router refuses to download any files larger than 300kb. Images won't load, files won't downloads, etc.
 I've swapped cables, tried two different computers, hard reset, loaded the 3.01 firmware and nothing seems to help.  I went back to my old router and it works fine.  I am able to transfer from computer to computer okay with the 825.
The cable modem is a SA dpc2100.

I'm not sure what else to do.

[FurryNutz]

Link>Welcome!

What region are you located?

Has a Factory Reset been performed both before and after the FW update?

Has the ISP Modem been updated? Motorola SB 6120, 21, or 6141 are recommended if your ISP allows you to have your own modem.
Check ISP MTU requirements, Cable is usually 1500, DSL is around 1492 down to 1472. Call the ISP and ask.

Some things to try: - Log into the routers web page at 192.168.0.1. Use IE, Opera or FF to manage the router.
Turn off ALL QoS or Disable Traffic Shaping (DIR only) GameFuel (DGL only and if ON.) options. Advanced/QoS or Gamefuel.
Turn off Advanced DNS Services if you have this option under Setup/Internet/Manual or under Setup/PARENTAL CONTROL/Set to>None: Static IP or Obtain Automatically From ISP.
Enable Use Unicasting (compatibility for some ISP DHCP Servers) under Setup/Internet/Manual.
Turn on DNS Relay under Setup/Networking.
Setup DHCP reserved IP addresses for all devices ON the router. Setup/Networking. This ensures each devices gets its own IP address when turned on and connected, eliminates IP address conflicts and helps in troubleshooting.
Ensure devices are set to auto obtain an IP address.
If IPv6 is an option on the router, select Local Connection Only or Disable IPv6 options under Setup/IPv6.
Set Firewall settings to Endpoint Independent for TCP and UDP under Advanced/Firewall.
Enable uPnP and Multi-cast Streaming under Advanced/Networking. Disable uPnP for testing Port Forwarding rules.
WAN Port Speed set to Auto or specific speed? Some newer ISP modems support 1000Mb so manually setting to Gb speeds can be supported by the router. Advanced/Advanced Networking/WAN Port Speed
Set current Time Zone, Date and Time. Use an NTP server feature. Tools/Time.
 

Turn off all anti virus and firewall programs on PC while testing. 3rd party firewalls are not generally needed when using routers as they are effective on blocking malicious inbound traffic.
Turn off all devices accept for one wired PC while testing.

Check cable between Modem and Router, swap out to be sure. Link> Cat6 is recommended.

What browser are you using?
Try Opera or FF? If IE 8 or 9, set compatibility mode and test again.

[eh?]

Well I did another 30-30-30 reset and this time it worked. Thanks for your help.
Still puzzled why it refused to download >300kb files on wired but ok on wireless 
Oh well just happy it works now.

[FurryNutz]

Glad you got it working.

Future reference:
FW Update Process

Good Luck and enjoy.