That looks like a 6+2 PCIe power cable. What is the DP/N of your 7090 psu? I guess you have the 360w psu which has a single PCIe power connector for discrete graphics card.
the 300w psu for 7090 only has 6+4+4 white pin connector for motherboard and no PCIe connector.
redxps630
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Posted December 2nd, 2022 16:00
Thank you chino. Yes DP/N 19WMR is one of the Dell 360w psu.
Dell Optiplex 360W PSU Power Supply L360EPS-00 19WMR 019WMR
it has 6+4+4 connector for 7090 motherboard and 6+2 PCIe connector for graphics card. https://kingofalldeals.com/products/dell-optiplex-360w-psu-power-supply-l360eps-00-19wmr-019wmr?variant=43476167098601