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Memtest might show that the ram is fine, but not other components. There could be many reasons why that machine is running slow. There could be a build of dust causing it to over heat. The capacitors on the motherboard may have become worn. Electromigration could be causing the CPU or Chip-set to not work as effectively.
Also the new HDD may not play well with the 11 year old computer.
Swapping components one by one (if you have spares) is really the only way to find out if you are sure it is not a software issue and not an obvious hardware fault.
I suspect your HD is not fully compatible with the old machine, in particular older IDE controllers (i assume being an older machine it has IDE) are unable to perform DMA for drives over a certain size, and thus the drive will be running in slow PIO mode.
I had a machine with a UDMA66 controller, a 60GB drive would perform well but anything bigger would be extremely slow.
Ofcourse, it could also be related to planned obsolescence, a lot of commercial software seems to get slower with age and speeds up again if you set the clock back and reinstall.
Old hardware dies slowly as it attempts to compensate for all the errors that come up as the hardware becomes more broken.
As a user you don't see any of this, but all the re-trying and error correction impacts performance.
Such errors would appear in the logs... And only higher end ECC memory even performs error correction, lower end memory will just introduce corruption if it's failing.





Member since:
2005-08-17
memory errors, harddisk errors.
Old hardware dies slowly as it attempts to compensate for all the errors that come up as the hardware becomes more broken.
As a user you don't see any of this, but all the re-trying and error correction impacts performance.