Is there a big difference between 5400 and 7200 hard drives?

I dont know which one to get. Should i upgrade to the 7200. Right now i have a 7200 hard drive in my powermac g5 and its great so would it be alot slower with a 5400 hard drive. Also to upgrade the drive do i have to order it online or can they upgrade it in the apple store?

Barefeats did some tests, and they conclude the Momentus 7200 is worth the upgrade. Also note this drive is slower than some other newer drives, so you could even get a greater advantage from other models. I've bolded pertinent information. Please note most performance increases are not seen in everyday emailing, web surfing, etc.
http://www.barefeats.com/hard56.html
Their Conclusion:
ANALYSIS
The Seagate Momentus 7200.1 takes notebook drive speed to a whole new level. It's not as fast as the fastest 2.5" (ed) 7200rpm drives but it's impressive nevertheless. And its quiet. It's a no brainer for a PowerBook internal drive replacement or as an external drive in a FireWire 800 enclosure.
WILL A 7200RPM NOTEBOOK DRIVE DRAIN MY BATTERY FASTER?
The short answer is, "Probably not." You see, the 7200rpm drives are as much as 28% faster doing random reads and writes compared to the 5400rpm drives. They are as much as 80% faster than 4200rpm drives. Yet the Hitachi Travelstar 7K100 uses the same amount of power as the Travelstar 5K100. The Seagate Momentus 7200.1 uses only 10% more power than the Momentus 4200.2. The Momentus 5400.3 uses less power than the Momentus 4200.2. My theory is that the "speed to power" ratio is so good with the 7200rpm drives that the net effect on the battery is negligible.

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