Re: Is there any reason why this power supply might not work with the 560s, given that only the power that is needed is drawn from the power supply? What logical and possible reason would prevent the Dell Inspiron 560s from booting normally with the RP-TFX-12V-48 [IMAGE]   it will work to power the mobo, cpu and sata drives.  It has no 6 pin gpu power connector. review: Noisy TFX PSU if you can bare the high pitch sound it makes. well this is good for SFF builds just dont expect to run high wattage GPU. Connectors 20+4 Pin Motherboard, 4-Pin CPU, 3x Molex, Floppy, 3x SATA Cooling 80mm Cooling Fan w/ Double Ball Bearing Input Voltage 100/240 V  Note it has no 6 pin PCIe connector.  But it has 4 pin molex.  If you want you may use two molex to 6 pin adapter to make your own 6 pin connector. [IMAGE]   the slim Inspiron is an old model (chassis and psu design similar to 530s/545s/Vostro 200).  The psu is not from a big name brand but would work just fine w the old pc.  It is good for tinkering if that is your hobby. Given the age of pc, if I were you I would prefer to buy cheap used psu of 460w just for hobby.  I would not consider serious upgrade of brand new psu in this model for long term use, but you may have your reasons.  
A06 BIOS (latest on support website). I was able to install a Radeon 5450, PCI Express 2.0, 1x16, 1GB (2GB model available), in my 560s, but I want to make sure the system has plenty of power (so it's not fighting for power between the CPU and GPU) for a second hard drive, or other future PCI (like a network card I have laying around), OR PCI Express expansion boards. New Egg sells a 420W replacement, model RP-TFX-12V-48. Is there any reason why this power supply might not work with the 560s, given that only the power that is needed is drawn from the power supply? 420W is the maximum power output, not an automatic, constant output, so it should work, right? What logical and possible reason would prevent the Dell Inspiron 560s from booting normally with the ,RP-TFX-12V-48, aside from not connecting things back up correctly?
Dell Inspiron 560s Power Supply Upgrade