Thank's MicroBell and Cappy,
I did not know that board is the one that determines the max size of RAM.(somehow Bios seem to be the god of gods). Could ever hapen to be that board are capible of biger RAM, but Bios not and on that case by flashing Bios,it will enable the system to take adventage of bigger RAM. Or whenever board is manufactured it is matched with the bios that already is compatible with the max RAM?...so by flashing BIOS it will never really allow to put bigger RAM.
I just flashed another Bios for another HP pavilion(6330) and it case, after flash it did boot with 512 RAM, but the OS showed only using 128 RAM. in this case is system using some part of 512 RAM or not? ..is it realy using only 128 RAM or all max 256, but only displaying 128?
MicroBell, i did flash BIOS with flcn_111.exe(link: http://h10025.www1.hp.com/ewfrf/wc/g...reitem=pv456en
) since my display adapter was not Sis 530 wiith version xxxx.1060. I have to admit before i flashed the BIOS, as it turns out now, i have not read discription of the flcn_111.exe very carefull and misunderstood it.
To sum up, there is no way to upgrade RAM higher than the board is compatible without upgrading the board?