What will happen if i upgrade ram to 4GB which is more than system spec....

Hi,
I have a macbook with following specs:
core 2 Duo
1 Gb stock ram 667MHZ DDR2
Model No: A1181
Part No: MB061X/A
i have found that my macbook only support total of 2GB memory with 1GB memory at each module. i was just wandering what will happen if i put 4GB (2 x 2GB sticks) memory kit in my macbook.
At some forums i have found that it may support upto 3 or 3.3GB memory but will putting extra memory have any kind of negative effect ???
and does any one know what is the supported memory limit of my macbook ???
Cheers,
Sohaib

sohaib zahid wrote:
Thanks for reply...
got 1 more question.... If i'll put 2 x 2GB RAM then still i'll be utilizing the dual channel ??? though only 3GB memory is being used by the system....
I'll start by saying that I've read Intel's chipset datasheets, including their sections on memory controllers, dual-channel, memory speeds, etc. With Intel's memory controller chipsets, they don't access two modules in parallel as an effectively doubled-width data bus. They still only perform read/writes data one module at a time. What you might get with "dual channel" operation is that it can get a small head-start when "ping-ponging" from one module to the other. It anticipates when it will be over, and will start off the other module to get a head start on the latency before data is available. Overall the advantage is small. In fact, Intel does do this when the memory modules aren't even matched for size - they call this "Dual Channel Asymmetric". It's supposed to perform dual-channel up to the high address of the smaller module. If you match sizes (doesn't even have to be identical modules or even speeds) Intel calls this "Dual Channel Interleaved", with the advantage throughout the entire address range.
For your application, some benchmarks suggest a small increase in graphics performance. However - having more memory almost always wins out over trying to achieve "dual channel". Check these tests:
http://eshop.macsales.com/shop/apple/memory/MacbookMemoryBenchmarks
n if RAM meets the specs of my macbook it won't panic kernel ???
Not likely although poor quality memory could do that when it reaches marginal conditions (i.e. high heat).

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