Processor does the number crunching, celeron is the lower end of the market chips (don't realy understand how they come about naming things)

RAM stores and sorts the info before number crunching, the more RAM the quicker any machine will run. Always go for RAM before CPU if you want to speed things up.

Your video card is not used in NLE systems, but if you play games I'd then suggest upgrade (don't get me started as now with PCIe you would have to upgrade your motherboard as well)

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