8Gigs of ram working or not?

Hello,

My question related to the pre unibody macbook pro's (the 4.1, which is the last of the non-unibody macbook pro's) is if it is possible to stack 8 Gigabytes of ram in it. Currently I have placed an SSD in it and have 4GB of ram. With an upgrade to 8GB I think it should be able to "keep up" for the next couple of years for me. And since memory is much cheaper (even though it is DDR2) than the time I chose to upgrade to four I wanted to know if it was possible.

Back "then" I found multiple topics stating that only 6 gigabytes of ram was possible. However since then Apple seems to have release a new firmware update which made is possible for some Macbook Pro's.

One topic I could find regarding this question is: Why is the maximum amount of ram available only 6Gb?

Even though some people with 8GB of ram in their MBP have some odd issues (overheating, being slower than before). I was wondering if this would be still the case, also when you are running Lion? Because the persons who had the problem there were running Snow Leopard.

I hope someone can clarify this. I really would like to have the 8GB of ram so my MBP wil be really snappy again even when running virtual machine's on it.