Question sapphire r9 390 nitro 8gb trix oc w/ dell t5500

Sep 14, 2019
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hello good people.
I was wondering if anyone could help me out with this.
im trying to run my r9 390 nitro on the t5500 power supply.
its works with two 8 pin adaptors.
but, it cuts out when the fans kick in and reboots the system.
any thoughts.
please and thank you.

ps I know I should run both 6 pin to one 8 pin. but what do I do for the other 8 pin??