Advice on my old PC upgrades or is too old?

[ECA]

only downside is the limited HD size and not being able to defrag them.

You can degrag them, but it's utterly pointless.

With a HDD fragmentation is a problem because you get slow read/write speeds and higher access times - none of that is applicable to an SSD so it doesn't matter.

 

[BloodOmen]

heard from a friend they actually break faster if you defrag them due to them working differently than normal hd's.