Remove firmware password by removing RAM which models are not effected?

One could reset in the past by removing the RAM etc.  I heard this changed at some point.
From what model MBP is this no longer possible? Or is this still the case?
I have a MBPi5 and a MBPi7.  

ChangeAgent wrote:
Thanks Csound1, good to know.
However, here, http://reviews.cnet.com/8301-13727_7-57520874-263/how-to-set-a-firmware-password -without-rebooting-in-os-x/ I found that it is since 2011 (4th Para).  I had also found other dates in other articles, so confusing.  or does somebody know better?
Message was edited by: ChangeAgent
Ignore cnet

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