Ideapad Z570 potential RAM upgrade or processor - help!

Hi all, I have a Lenovo Z570 with a i7-26700QM @2.2 GHZ, 8GB RAM and a Nvidia GeForce GT540M. I've started playing some games such as Dayz running on lowish settings. Obviously, these are big RAM users, so I;ve been looking into the possibility of upgrading the RAM to 16GB which according to these forums has been done despite the fact maximum ram is meant to be 8GB.
I was wondering if it's worth me upgrading the RAM or if it might be better for me to upgrade the processor/graphics. Any opinions would be greatly appreciated. Also, if RAM is the preferential choice, could anyone point me in the direction of which ones to buy? The last few threads have been slightly out dated.
Thanks.

You're very welcome, Chris.
It is like that for all of the dc5xxx and dc7xxx business desktops.
HP made a change to that when the 8000 Elite business desktops came out.
You can put any size memory you want in each slot, and you won't get any errors, but the PC's memory will run in something called 'Flex Mode" which basically means DDR mode is disabled.
The dc5xxx and dc7xxx models just give you the 5 beeps and won't go any further until the memory is properly configured.
In order to run in DDR mode, you need matching capacities of memory in slots 1 and 3, and 2 and 4 for all HP business desktops.
Best Regards,
Paul

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****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
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