What's wrong? I can't determine the cause of it.

Hi all,
I've gotten myself a macbook online (2 ghz with the stock 512 megs of ram).
I bought myself 2 pieces of patriot 1 gb (it's of correct specifications) and installed them at a computer shop a week ago.
Upon booting up, everything runs perfectly normal. Usually after a certain period of running, the entire system slows down. They widgets and expose features seem to lag whenever they come on. My entire system practically slows down.
I doubt it's a ram issue as many have installed patriot rams onto their macbooks. I've did a memory test, apple hardware test and all yielded the 'ok' sign.
Anyone experiencing the same problems?
Any idea what's the cause of this problem? I'm quite disappointed that this is happening.
Alvin
Macbook   Mac OS X (10.4.7)  

Try reinstalling the original RAM and testing using only one app and Dashboard. With 512MB of RAM having multiple apps could cause the slowness due to paging depending on how you use those apps.
If after a while it still slows down more than it was a few minutes after booting, then you might have ran into an issue one or two others here have seen where after getting to a certain point heat-wise the machine severely slow down.
If it behaves normally with 512MB, then there could be some issue with the RAM. Apple's Hardware Test, while a great resource, will not necessarily detect every single possible problem with RAM. What may be happening is there is a timing defect or corruption that occurs when the RAM reaches a certain temperature and/or a certain memory location on the chips. As such it would take a while for the machine to warm up enough or for it to finally get to a point where it accesses those addresses.

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