Network speed too low

[Michi1994149]

Hey,first of all sry for my bad english (i'm austrian^^)

 

 

All my network cabeling was done with a CAT6 S-FTP CCA cable by myself.

Router: FritzBox 7390 Austria Edition 

Switch1&2: 2x TP-Link SG1005D

NAS: Synology 214play

Pc1: NIC of the mainboard( asus rampage 4 extreme)

Pc2: NIC of the mainboard( asus maximus 3 gene)

Nootebook: Marvell Yukon 88E8057 NIC

 

--> all is gigabit-grade equipment

 

 

My normal network looks like following: router-20m->switch1-10m->switch2-3m->pc1

                                                                        -7m->pc2

                                                                        -0.5m->nas

Let's introduce my problem:

 

I only get 11.0-12.0 MBps when copying files from my pc1 or pc2 to or from my synology nas.

 

My pc2 is locked to 100Mbitps, even when i ramp up the speed of the controller to 1000Mbitps manually.

 

As soone as i replaced my pc2 with my pc1, my transfer rate went up to 110MBps.

 

When i replaced the switch1 with my notebook, i got no connection to my network because i used gigabit speed on the nic-controller of the notebook.

When i replaced the switch1 with my notebook, i only got connection to my network as i used the 100Mbitps speed-option on the nic-controller of the notebook.

 

Does anyone knows a solution for this problem????

I realy get frustrated by this problem..........

 

Thx for reply up front.

[Michi1994149]

Little update: 

 

I tried to replace my pc2 with my notebook and when i set the nic to gigabit the notebook connects to the network and disconnects immediatly.....