GA-P35C-DS3R rev 1.x F12 Wont recognise full amount of new RAM

[christosGr]

Greetings,
I have just purcached 2 sticks of KVR13N9S6/2 (DDR3 2GB FSB 1333 PC3 10600 CL9 240 pin RAM).
i have mounted them on my mobo and i observe that in Bios only 510 MB are recognised and not 4GB of ram.

I run Win7 32b and Ubuntu 14.04 32b. Both operating systems recognise only 510MB of ram.
Is this an OS issue that i can solve with installing a 64b OS or do some patching, or  is it a HW issue i cant overcome?

MOBO: GA-P35C-DS3R rev 1.x F12
proccesor: Intel® Core™2 Duo Processor E6550 (4M Cache, 2.33 GHz, 1333 MHz FSB)
RAM: 2x KVR13N9S6/2  (DDR3 2GB FSB 1333 PC3 10600 CL9 240 pin RAM)

Thank you in advance,
Christos

[autotech]

what bios are you using. could be that or swap into different slots. might be the ram.

[christosGr]

what bios are you using. could be that or swap into different slots. might be the ram.

As i wrote before, I had to update my BIOS to the  F12 version.
The p35c ds3r MOBO has two slots of DDR3 ram. What i did was to put each of the sticks to both slots (one at the time).
The amount of recognised ram didnt change (~250MB/stick).

Thank you