Problems in upgrade of Mac Mini from 256 RAM 512Ram

I recently upgraded my Mini from its 256RAM to 512 RAM. The new RAM is a Transcend DDR 400 whereas the old one was a Hynix DDR 400. After the upgrade I am experiencing difficulties during editing. Both in FCP 5 and i Movie. The clips do not flow smoothly. They keep freezing up. I have also run a hardware test and the RAM seems to be fine. The supplier is also running out of ideas. Does anybody have an idea what the problem could be.

Hi Terry,
I am new to the world of mac but your problem may not be ram related. I had a problem when using I Movie where the clips were freezing. It was due to filevault being used on the home folder which was where the clips were being imported into. It was resolved by importing them directly onto the hard disk instead. I think that because filevault encripts its files on-the-fly it creates slight delays in the streaming of the data causing it to fail or freeze.
Hope this helps - Daragh

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Supported PHY Modes:    802.11 a/b/g
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bsglwn:
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http://support.apple.com/kb/SP575
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http://store.apple.com/uk/product/MC573/mac-os-x-106-snow-leopard
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