Modders don't want to buy a complete power supply to test out Slims. Instead of having 2 PHAT power supplies, just just your normal power supply and then plug in the adapter when you want to test out a slim. Cheaper, cleaner, and easier.
You should replace your laser lens if your system has the following problems:
PlayStation 2 TV Video System Converter (NTSC>PAL) !
Warning: Molex connector provide 12V and 5V power lines, but not 3.3V required by some SATA drives. Make sure your drive does not require a 3.3V power connection before purchasing this adapter