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higher RPM drives do two things for performance, they speed up the actual data reading from the HD and cut down 'rotational latency' the latter means the time taken for the head to get data thats a revolution or less away.
Its like having a sentence written on a big disk, the start of the sentence is 180o away from the viewer, the rotational latency, is the time it takes for the disk to get to the start of that sentence, the data read time is how fast you read the words.
The downside is typically high RPM drives run hotter and are noiser, as with any mechanical system they can fail more often at higher performance levels
33% faster is the absolute fastest youll get out of it, but thats given that, you defrag the data, and that the disk reading is the bottleneck in your data transfer.
power consumption is higher as well for the laptop people wanting 7200 or 5400.
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