[SOLVED] Having trouble finding a compatible PCIe Power Connector for dual GPU build

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Apr 21, 2022
My new PC build has been freezing frequently when under heavy load, mostly when rendering models in Redshift which uses both GPUs (full build below). When I disable my second GPU, the freezes do not happen anymore. Especially considering how power-hungry the 3090 is (and this PC has two of them), this leads me to believe that the issue is with the power draw, but I could be wrong. The motherboard's instruction manual recommends for dual GPU builds to connect a supplementary PCIe Power Connector cable from the power supply to the motherboard, but I'm having trouble finding the correct cable. Any help is greatly appreciated.

Photo from mobo's instruction manual: https://postimg.cc/WhtfSmhy

Photo of the "OC_PEG" port on mobo: https://postimg.cc/1nYnvkzn

Photo of the GPU power ports: https://postimg.cc/KR4SXd8c

PC Build:
CPU: AMD Threadripper 3990X 2.9 GHz 64-Core Processor
CPU Cooler: NZXT Kraken Z73 73.11 CFM Liquid CPU Cooler
Motherboard: Gigabyte TRX40 AORUS XTREME XL ATX sTRX4 Motherboard
RAM: G.Skill Trident Z RGB 128 GB (4 x 32 GB) DDR4-4000 CL18 Memory
Storage: Samsung 980 Pro 2 TB M.2-2280 NVME Solid State Drive
GPU: Asus GeForce RTX 3090 24 GB STRIX GAMING Video Card x2
Corsair 780T ATX Full Tower Case
Power Supply: Corsair AXi 1600 W 80+ Titanium Certified Fully Modular ATX Power Supply

SOLVED: AMD Threadripper 3990X 2.9 GHz 64-Core Processor only supports up to 3200 RAM speed which is likely what was causing the freezing. Also found the cable I was looking for:
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