Tiger, many thanks your assistance!
Printed number on PCB is - GA-3CESL-RH Rev 1.1
I don't know how it possible, but someone before me flash the BIOS
with version 3CESL3-F3. BIOS DATE 07/16/09.
Anyhow motherboard is booting and working fine.
Also I read that 3CESL3 working with 2400 series (Six-Core Istanbul Opterons)
So, it looks like now my GA-3CESL-RH (flashed with aforementioned BIOS)
should work with Barcelonas (ex. Opteron 2384 ) or even with 24XX Istanbul six-core processors ?