Issue with Internet speed stability.

[Rekindled]

So in my house I have several PCs 1 connected via ethernet and the rest connected via WiFi.

The one connected via Ethernet is the one with the issue, it runs a x79 intel chipset and uses the inbuilt intel network card. (Full hardware specs below).
The rest of the PCs have very good speed stability (sitting @ 6.2mb/s) whilst this one fluctuates a lot. - I have included an imgur gallary of speeds over the past few days. I cannot steam youtube videos or twitch.tv.

Here are the things I have tried to fix the issue.

• Reset Internet Router
• Try New router
• flush DNS
• Different Ethernet Cords
• uninstalling and re-installing network drivers
• I have also tested a laptop via Ethernet and it worked fine so I think it has something to do with the PC.
• EDIT: Uninstalling VPN Client (see below)

There is one thing that helped greatly.

Which was connecting via my University's Cisco VPN Client. This shot my speed to 5.5mb/s and was stable enough to watch youtube in 720p. However, the university charges $30 per GB of data through the VPN which doesn't go through the Uni Blackboard Framework so that isn't really an option

Full PC specs: (Media workhorse/Gaming PC)

• i7 3930k
• x79 Asus Rampage Forumla IV
• 32GB of DDR3 RAM @ 1600mhz
• GTX 780Msi OC
• Windows 7 64bit
• Crucial 128GB SSD M4 (Boot drive)
• Samsugn 256GB SSD 840 (Game Drive)
• 4x3TB Seagate Barracudas (Storage Drives)

Thanks for any help.

[the game]

Is this happening all the time? Have you ran tracerts? They can tell you where the issue may be. Also running wireshark on your computer can be helpful too.

[Rekindled]

Thanks for the ideas, I have already run virus scans and what not (nothing there) and I did end up buying a wifi card; but it was PCI and I don't have any slots on my MpBo, LOL! Just going to re-install windows

[Cyrops]

Thanks for the ideas, I have already run virus scans and what not (nothing there) and I did end up buying a wifi card; but it was PCI and I don't have any slots on my MpBo, LOL! Just going to re-install windows

The MB built-in lan parts tend to go heywire (highwire?), should have bought a lan card instead of wifi. You don't have any PCI slots at all or any free?
There is a USB ethernet adapter: http://www.amazon.com/Cisco-USB300M-.../dp/B001NLV4TQ
Not that expensive and you can keep it for future.

Have you tried different cable itself? I had a faulty port instalation in the wall, the internet went out for no reason sometimes. I checked it with lan test from work. But not everyone can get their hands on one so that might be not an option.