2 Computers on same network different speeds.

[BenKrapohl]

Hey yall, I've been trying to solve a problem with my network that I cant seem to figure out. Im going to lay out the situation and every solution I have tried below. 

I have 2 windows 10 PC's that are both cat5e connected to my router but one gets significantly faster internet speeds than the other. Both are in the same room about 4 feet apart. Some basic solutions probably come to your mind but trust me I have probably tried it. (ill list them later on)

My Server PC has a i7 6700k and a ASRock Z170A motherboard, this PC gets the expected internet speed (950 down and 40 up)  

My gaming PC has a R9 3900x and a ASUS TUF X570-Plus mb. This gets a VERY unstable download speed (ranging from 150-500) Never higher but has a stable 40up. You can also see it peaks then goes down as compared to the server PC

(Ping is identical between the two)

 

I want state here before I mention the things ive tried that yes I have tried different cat5e cables and have used the others PC's cable to the same results. As well as changing ports on my router. Also I know this ethernet port on my gaming PC isnt damaged because before I switched to a 10gb network, I used that 1gb ethernet port for file transfers and regularly saw gigabit speeds.

Everything I've tried

• Restarting the PC
• Restarting the modem & router
• Factory resetting the modem and router
• every variant of windows autotuning (including setting it to normal)
• different cables and ports on the router
• As far as I can find my router doesn't have any QOS settings (its a spectrum SAX1V1S router) Please feel free to tell me im dumb
• Trying different websites and browsers to test the speeds
• Tried a speedtest on a Linux VM on my gaming PC 
• Ran Malwarebytes incase something was maliciously using my internet
• Disconnected everything from the network except for my gaming PC
• Released and renewed my lan IP (tried 3 different IP's)\
• safemode with networking fixes the whole problem which is how I know its software obviously

As you can see I have crossed off most of the forums and YouTube advice I could find. Its clearly not a big deal for most day to day things but it is an issue and I cant figure it out. Any and all advice would be greatly appreciated! 

[mariushm]

Try transferring a big file between the computers, through the router (network cables connected to router, so that the router's switch moves packets between the computers)

 

If you get gigabit speeds, it's either not a hardware fault (bad drivers, bad network card) or some software isn't active for local (trusted) IP addresses

 

There may be some firewall or antivirus  with some traffic filtering stuff built in intercepting the traffic and searching it for viruses or whatever, and that could explain the computer being slower. That software may not filter the local traffic.

 

Go in network card's advanced settings (through Device Manager) and disable any green / power saving feature, just in case the network cable is marginal and these power saving feature cause corrupted packets or lost packets While you're there check the Jumbo frames option - if it's active and set at some value, maybe the router doesn't like that value... some are buggy with certain jumbo frame sizes.

 

Could try booting from a Linux live cd/usb stick to see if your transfer speed is higher in Linux, just in case it's a default network card driver or some other issues in the Windows you have installed.

[rrats]

Firewall maybe?

[BenKrapohl]

8 hours ago, mariushm said:

Try transferring a big file between the computers, through the router (network cables connected to router, so that the router's switch moves packets between the computers)

 

If you get gigabit speeds, it's either not a hardware fault (bad drivers, bad network card) or some software isn't active for local (trusted) IP addresses

 

There may be some firewall or antivirus  with some traffic filtering stuff built in intercepting the traffic and searching it for viruses or whatever, and that could explain the computer being slower. That software may not filter the local traffic.

 

Go in network card's advanced settings (through Device Manager) and disable any green / power saving feature, just in case the network cable is marginal and these power saving feature cause corrupted packets or lost packets While you're there check the Jumbo frames option - if it's active and set at some value, maybe the router doesn't like that value... some are buggy with certain jumbo frame sizes.

 

Could try booting from a Linux live cd/usb stick to see if your transfer speed is higher in Linux, just in case it's a default network card driver or some other issues in the Windows you have installed.

• File transfer is perfectly fine, (makes me very confident that its not hardware related)
• I've looked up and down my firewall to find what could be causing it in the firewall but I cant find anything. 
• And I have booted to linux via my VM and its the same issue. Yet in safe mode with networking its perfect