I have 1GB RAM in my notebook (HP Compaq 6735s), but the video card is using 256MB, so I'm left with 768MB RAM.

However, whenever my system starts using more than 85% of memory, it becomes **unusable**. It literally stops. With a swapfile it slowly wakes up, once it has freed enough RAM, but without it, my system **freezes**.

Is this caused by system misconfiguration or is it normal behaviour?

Thanks.