iirc, your motherboard bios will automatically set all your RAM timings to the same timings, and the chain is only as strong as the weakest link
therefore if you have a stick with 5-5-5-12, and another stick in with 4-4-4-12, it will set both at 5-5-5-12
There shouldn't be any loss of speed because you have a 32-bit OS installed, although, you probably know already that not all of the 4GB RAM will be used (reserved for shared RAM etc.)
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