I have tried to boot with each time only one stick - and each time it shows me 1GB for it.
After doing some google-work, I found out that I'd have to raise the voltage from 1.8v to 2.0v for this RAM sticks. I've also changed in my bios some clock speed of 667Mhz to 800Mhz.. but nothing changed.
Any idea what I might have overseen?
I've a Gigabyte EP45-UD3LR Mainboard with the latest firmware (F11).