The only problem you can bump into (literally) is if there is something blocking the spot where the 24 pin cable hangs over the end. ![]() But it's okay to leave those 4 pins disconnected because a motherboard with a 20 pin connector doesn't need them. The extra 4 pins were added to the 24 pin version of the cable to provide one extra wire for ground, 3.3, 5, and 12 volts. The 24 pin cable only fits into a 20 pin socket at one end so you can't plug it in incorrectly. The extra 4 pins on the cable just hang over the end of the motherboard connector. You can see an example in the picture above. If you have an ATX power supply with a 24 pin main cable, it's okay to plug it into a motherboard with a 20 pin connector. Unofficial cable/connector maximum wattage delivery for main rails Most newer power supplies don't provide -5 volts in which case the white wire is missing. Newer motherboards virtually never require -5 volts but many older motherboards do. The -5 volt line on pin 20 was made optional in ATX12V 1.3 (introduced in 2003) because -5 had been rarely used for years. These are pretty common on the 3.3 volt line in pin 13 but are sometimes used for other voltages too. Some of the voltage lines on the connector may have smaller sense wires which allow the power supply to sense what voltage is actually seen by the motherboard. The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction. The extra pins made the auxiliary power cable unnecessary so most ATX12V 2.x power supplies don't have them. The new 24 pin connector added one line apiece for ground, 3.3, 5, and 12 volts. The older 20 pin main power cable only has one 12 volt line. The 24 pin main power connector was added in ATX12V 2.0 to provide extra power needed by PCI Express slots. I have never ran into that before, but I guess that is Dell for you and making everything so difficult to do.Standard 4.2mm Pitch ATX Header Connector Datasheet What is the point of the TPM? Annoying as hell. I'm giving it a few weeks to make sure it all works before I format the old HDD, but so far so good. Luckly it boots up now and all seems to work. ![]() Anyway, I ran the trouble shooting from dell (from USB) and then it scanned and fixed whatever errors it found. I think it's this annoying TPM thing that is in the bios (built in?) and everytime there was a new OS drive, it wouldn't detect the HD. Soooo, seeing that I don't want to buy a new copy of that program in 2021, I cloned the HDD with Aoemi Backupper (free). Side note for reference: I had originally installed w10 onto the new SSD, but then I had an old program that wouldn't install / register anymore (older QB's Premier 2007). Just to close this out, I have bought the power cable and have updated the system with a new SSD. Would this cable from amazon suffice? Link: Cable Can anyone confirm if this is the correct assumption and what cable I need? I went to microcenter, but the guy said "oh thats a Dell thing, we don't have those kinds of cables" =/ They are labeled similarly on the diagram, but they look ever so slightly different. I've just never ran across power like this for hard drives - coming from the mobo instead of the power supply. Is this an additional power port for additional SSDs/HDs? I would think it is since there are two free SATA ports at the moment (#3 and #4) and they would need power. Yellow = Not in use in my set up currently. ![]() Purple = where power is currently being taken from motherboard to power HD and DVD Rom. I looked up the instructions online and found this diagram of the mobo: THat being said, upon opening the case, I noticed there were no extra power cables coming from the power source or piggybacking another power cable. I'd like to keep both the HDD and DVD Rom functioning, but if it comes down to it I can always use the power from the DVD rom to keep the HD and SSD working. It currently has a regular HD and an DVD rom. I am looking to update this small office computer with an SSD.
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