B85M-ITX - NIC + CPU C6 = SLOW INTERNET

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   Hello,
i recently purchased an B85M-ITX on ebay for cheap and got myself a G1840 Celeron in addition.
Both are working quite well .. but I still have some huge issues as soon as I enable energy saving features.

What I did so far:

- Update do BIOS 2.50
- Enable all C-State realated settings
- Enabled C6 Package C-State

So far so good .. my rig is runnig quite and smooth .. PC to PC network performance is remarkagble .. 110MB/s .. close to the theoretical gigabit cap .. 

But then ...

Downloading stuff from the interweb is terrible slow

- I got a 35MBit connection (verified by other PCs in my household)
- .. changed network cables, switch, direct connection to the fritzbox ..
- Windows 10 32bit .. the same as Windows 8.1 64bit ..
- All NIC-driver versions I could find from 2.1.0.7 to 2.1.0.21

What did I obverseve:
- Default BIOS/UEFI .. no issues
- Enabling C-States .. slow Internet download .. fast Network transfer ..
- Switching from gigabit auto negotiation to 100Mbit full duplex .. no issues, Internet ~35mbit .. as it should be.

With slow internet download I mean ~3Mbit .. jumping eradically .. nothing solid ..

Switching from 2.50 to 2.40 got me 3-18Mbit .. but all far from stable ..

My guess is the C6 State and the integrated NIC are interfering terrible .. 

I will try out to selectivly disable Package and CPU C-States to find the culprit .. still .. this is not acceptible ..

Edited by cimba007 - 03 Apr 2016 at 4:01am

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cimba007 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 03 Apr 2016 Status: Offline Points: 7	Post Options Post Reply Quote cimba007 Report Post Thanks(0) Quote Reply Posted: 03 Apr 2016 at 3:39am
	Hello, i recently purchased an B85M-ITX on ebay for cheap and got myself a G1840 Celeron in addition. Both are working quite well .. but I still have some huge issues as soon as I enable energy saving features. What I did so far: - Update do BIOS 2.50 - Enable all C-State realated settings - Enabled C6 Package C-State So far so good .. my rig is runnig quite and smooth .. PC to PC network performance is remarkagble .. 110MB/s .. close to the theoretical gigabit cap .. But then ... Downloading stuff from the interweb is terrible slow - I got a 35MBit connection (verified by other PCs in my household) - .. changed network cables, switch, direct connection to the fritzbox .. - Windows 10 32bit .. the same as Windows 8.1 64bit .. - All NIC-driver versions I could find from 2.1.0.7 to 2.1.0.21 What did I obverseve: - Default BIOS/UEFI .. no issues - Enabling C-States .. slow Internet download .. fast Network transfer .. - Switching from gigabit auto negotiation to 100Mbit full duplex .. no issues, Internet ~35mbit .. as it should be. With slow internet download I mean ~3Mbit .. jumping eradically .. nothing solid .. Switching from 2.50 to 2.40 got me 3-18Mbit .. but all far from stable .. My guess is the C6 State and the integrated NIC are interfering terrible .. I will try out to selectivly disable Package and CPU C-States to find the culprit .. still .. this is not acceptible .. Edited by cimba007 - 03 Apr 2016 at 4:01am