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What's the safest way to use a Corsair HX1200 with an RTX 4090?

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Hi! I have a Corsair HX1200 which I'm planning to use in my new build that has an Asus RTX 4090 TUF OC. The adapter bundled with the card has 4 8 pin PCIe power connectors, they recommend using 4 dedicated cables and not use pigtails.

I watched this video and from what I'm getting here he's saying the HX1500i which is even more powerful then my PSU he says "I would think they would have 4" he doesn't finish the sentence but from that I assume it doesn't which probably means mine doesn't either. Currently I have an MSI SuprimX 3080 Ti that has 3 8 pins and I'm running a 9900K in a Rog Strix Z390-H Gaming board and I bought the Strix Z790-F gaming board with an 13900KF which will also need 8 pins that go into the motherboard from what I understand.

What's the safest setup for this system? Can I use 4 separate cables with this PSU? Should I only use 3? I attached a photo of the current setup (a little dusty I know, I will clean it before installing into the new setup)

Edit.: Also I can see it's set to multi-rail instead of single, is that good or should I use single rail?



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