PCIe 5.0 power connector allows up to 600W of power, for next-gen GPUs
PCI-e 5.0 GPU Power Cable - 70cm 16pin (12+4) 12VHPWR Male to Male Sleeved Cable with Combs, 600W PCIe 5 Power Cable for Geforce RTX 3090Ti 4070 Ti 4080 4090 to ATX 3.0 Modular Power Supply - Newegg.ca
MEG Ai1300P PCIE5 | Power Supply | Overflow With Power
CORSAIR 2' Premium Individually Sleeved 12+4pin PCIe Gen 5 Type-4 600W 12VHPWR Cable White CP-8920332 - Best Buy
MSI - MEG Ai1300P PCIE 5.0, 80 PLATINUM Full Modular Gaming PSU, 12VHPWR Cable, 4080 4090 ATX 3.0 Compatible, 1300W Power Supply - Newegg.com
Expect To See Nvidia's 12-Pin Power Plug On Future PCIe 5.0 GPUs | Tom's Hardware
Best Buy: CORSAIR 600W PCIe 5.0 / Gen 5 12VHPWR Type-4 PSU Power Cable Black CP-8920284