Since you have a 32-bit system, 4GB is the maximum value you can set...

Max i am able to set is only 4GB

and with the pae installed 4gig-1 is the MAX that 32 bit can use

have you talked to your novell rep seeing as you need to be paying them for support for SELS or SELD 10
or is this OpenSUSE10 ( opensuse 11.2 and 3 are supported )

HIGHMEM is the way to go,
I did it in the past with a HP server (DL180 I guess), 6Gb installed on it and a 32bit system (in that period, I'm now using only 64bit systems on real servers with Linux). I've compiled my own kernel for it, HP systems already have PAE, don't know about your current machine (manufacturer/model ?)

Hi Arun, you can't allow more than 4 GB in a 32 bits system. the Max is 4GB, from which 3.4 GB are just for the use and the other 600mb is for system allocation. This is not a configuration problem is a hardware problem, if you want to use more than 4GB change your processor to a 64 bits and use a 64bits Linux Version... hope this can help you