Newbie help with 4080 super

New to gaming pcs I just received my prebuilt 2 weeks ago and ordered a gigabyte 4080 super my question is will I need a new power supply as I only found one pcie power cable that had two 6+2 pin connectors but the gpu needs 3 connectors these are the specs of the pc I just purchased sorry for maybe asking a dumb question

Chassis Model: Digital Storm Lynx
Processor: AMD Ryzen 7 7700X (8-Core) 5.4 GHz Turbo (Codename Raphael)
Motherboard: ASUS Prime B650M-A AX (Wi-Fi) (AMD B650) (Up to 3x PCI-E Devices) (DDR5)
System Memory: 16GB DDR5 5200MHz Kingston FURY Beast
Power Supply: 750W Digital Storm Performance Series (80 Plus Gold)
Storage Set 1: 1x SSD (240GB Digital Storm Performance Series)
Storage Set 2: - No Thanks
Storage Set 3: - No Thanks
RAID Config: - No Thanks
RAID Card: - No Thanks
Optical Drive: - No Thanks
Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Graphics Card(s): 1x GeForce RTX 4060 8GB (VR Ready)
Sound Card: Integrated Motherboard Audio
Add On Card: - No Thanks
Extreme Cooling: AIR: Stage 1: High-Performance Copper Heat Pipe Cooler
HydroLux Tubing Style: - Not Applicable, I do not have a custom HydroLux liquid cooling system selected
HydroLux Fluid Color: - Not Applicable, I do not have a custom HydroLux liquid cooling system selected
Cable Management: Premium Cable Management (Strategically Routed & Organized for Airflow)
Software Control: - No Thanks
Internal Lighting: - No Thanks
Chassis Fans: Digital Storm Performance Series (RGB Fans)
CPU Boost: Factory Turbo Boost Advanced Technology
OS Boost: - No Thanks, Please do not tweak the services on the operating system
Operating System: Ubuntu Desktop (Linux)