If you had changed country on the Canadian site to USA you will see this cable which I believe is what you are looking for and considerably cheaper than the cable on the link you posted. If that does not work then go to the Amazon USA site and search for SATA power cable extension.
Hi everyone, I have one of those XPS 8950's with a cage for an extra HDD located above the power supply. I managed to find a drive caddy with a SATA data cable, but SATA power supply cord provided by Dell is just too short. Anyone know where I can get an extension cord for a SATA power cable?
XPS 8950, extension cord for SATA power cable