Early 2008 MacBook Pro RAM upgrade limited to 3GB??

My brother in law has an early 2008 MBP, 2.4GHz, I'm pretty much sure we are talking about the one described in this Apple tech specs:
http://support.apple.com/kb/SP4
Now, it says that it supports up to 4GB of 667MHz DDR2 SDRAM. He bought 2x2GB Kingston memory modules , but the shop sold him the 800Mhz ones. Still they do fit and if only one is present together with the old 1GB 667MHz one it works fine reporting a total of 3GB. With the 2x2GB together the MBP doesn't even start.
My understanding was that such a MBP could support up to 8GB of RAM with the new 4GB memory modules (well probably with SL at 64 bits, which works). Personally I have an early 2007 MacBook and I know there is a 3GB limit due to the GMA 950 (video chip) reserving higher addresses.
Is there a similar situation for the MBP? I thought the memory speed being higher shouldn't matter (and it works indeed with one 800MHz module). Or is that MBP really limited to 3GB maximum? Any idea?
Message was edited by: Michelasso

yes, he will bring everything here today. I think he didn't buy the KTA MB800 anyway (made for Apple by kingston). Just generic. They are too cheap. But I have to check. Reading around I've found out that only the Penryn MBP should have the problem with faster RAM. Here is a good guide:
http://forums.macnn.com/69/mac-notebooks/358184/a-guide-to-macbook-ram-upgrades/
Well, he's still on time to give the RAM back and get the refund. Thanks for your help anyway.

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