I wanted to upgrade my dell optiplex 7040. I got it at a government surplus auction and was surprised when it had an i7-6700 and 32gig of ddr4 memory. That’s better than the one I have. I thought it would be easy, just get a new power supply and graphics card. Here is a picture with the graphics card in it.
I was amazed that the geforce 660 ti even fit inside of it. It was tight but it fit and closed just fine. The power supply would not fit inside and I am not against a ghetto computer so I was going to leave it outside and use gorilla tape to attach it. I tested it of course before doing anything permanent and nothing showed up on the lcd screen. No signal whatsoever. After doing a bit of research I found out that these dell motherboards limit the pci-e slot wattage to 35 watts. It is supposed to be 75 watts, so the card wasn’t even turning on. Frustrating to say the least. The power supply was a challenge too because these optiplexes use a propriety 8 pin supply connector. I tried to solder one up based on some pictures I saw, but was missing the key component. The 5v always on line is actually 12v in dell optiplex 3020, 7020, and the 9020 series. I got on ebay and ordered one. It worked great, but like I said, the motherboard just doesn’t give the pci-e slot enough juice for these high end graphics cards. Optiplexes are great for energy efficiency, the psu that comes with it is only 240 watts.