NVRAM: Non-Volatile Random Access Memory, a type of memory that retains its contents when power is turned off. Usually used to store BIOS data.
The "check" at boot up is just to make sure the data stored in the nvram is valid.
I don't see any harm in disabling the check...nor do I see any harm in allowing it to continue.
There were some issues with motherboards actually hanging up on the nvram checks due to some configuration problems - I haven't heard of that in awhile tho... if your PC boots through the check with no issues I would say it's totally up to you as to allow or not.
Hope this is a little help.