I heard brad waking me up.  you got the correct adapter for 7090.   7090 and 7080 use same psu interchangeable with XPS 8940.  all have 6+4+4 pin.  by this logic, if sfx + adapter works for 8940, it will definitely work for 7090. 8940 user onefunkydude had validated Amazon 24-6 pin adapter, “I used the adapter COMeap 24 Pin to 6 Pin ATX PSU Power Adapter Cable for Dell Motherboard with 6 Pin Port 13.3-inch(34cm) on amazon and it works fine." caveat from same user "I still don't recommend this as the PSU stays on after shutdown and requires you to flip the switch for it to turn off. Also, the cable management is still bad" [URL]
I want to upgrade this tower with a more powerful gpu and I want to buy the seasonic focus spx psu for it. my problem is I need a 24 pin to 6 pin connector to power the mobo. I found this connector but I am not sure it will work with my model since its newer and has an 11th gen cpu.thank you for reading my problem ^^
dell optiplex 7090 tower psu upgrade