Low hdd IOPS - should I be worried?

I have been having issues with a pc that's randomly losing power. Ever since, I've been finding new ways to stresstest everything to try and find a way to force the power loss in order to be able to debug it. (Still haven't found it). Today, I got a lot of disk errors before the crash, according to windows logs. (Bad sectors). However, scaing it didn't tu up anything.

Anyway, this prompted me to install buintest and test my harddrives. Now, the results are kind of awkward:

The disk pointed out by windows would've been disk E:. This happens to be the oldest disk I have, and as you can see, it doesn't even reach half of the operations speed that faster disks do. on an important note: All disks except for C: are 7500RPM harddrives. (C: is an SSD)

You can clearly see that H: (also an older disk) also doesn't even reach half of what G: and I: reach. It's important to note that disk I is ~1 year old and G is only 2 weeks old. It would be no surprise to me that the IOPS drop after time, but my question is, how much should these (extremely low) results worry me?

small update: This screenshot was taken after 11 minutes. After 20 minutes, the difference kept about the same % ratio