Well, I have thought about getting an ASUS 4080 as a backup incase of the 3090 Ti doesn't work out, But I have thought about a 3080 Ti (Same Make as the 3090 Ti) if that doesn't wotk out... But can an RTX 4080 (ASUS) fit into my budget and still play nice with a 12900k?
Unless I've missing something, if you live in the USA then your budget $2,850 should be quite sufficient. I would actually look at the 4080 and not the older 30 series cards. The below is a tiny bit over your budget but does get you DDR5 6000. I couldn't see the Asus Tuf 4080 on Amazon, however it's available for $1,400 directly from Newegg so it would still be the GPU I would go for. The 4080 would work well with a 12900K. You mentioned undervolting in an earlier post. I would highly recommend doing this, Alder Lake seems to respond quite well to it and it takes some of the heat and power consumption away.
PCPartPicker Part List: https://pcpartpicker.com/list/48R3pH
CPU: Intel Core i9-12900K 3.2 GHz 16-Core Processor ($412.88 @ Amazon)
CPU Cooler: Deepcool CASTLE 360EX RGB 60.6 CFM Liquid CPU Cooler ($177.15 @ Amazon)
Motherboard: MSI MAG Z690 TOMAHAWK WIFI ATX LGA1700 Motherboard ($275.99 @ Newegg)
Memory: Corsair Vengeance 32 GB (2 x 16 GB) DDR5-6000 CL36 Memory ($149.99 @ Newegg)
Storage: Western Digital Black SN850X 1 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive ($99.99 @ Western Digital)
Video Card: Asus TUF GAMING OC GeForce RTX 4080 16 GB Video Card ($1359.99 @ Amazon)
Case: Fractal Design Torrent ATX Mid Tower Case ($189.99 @ B&H)
Power Supply: Corsair RM1000x (2021) 1000 W 80+ Gold Certified Fully Modular ATX Power Supply ($189.99 @ Corsair)
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2023-02-06 05:12 EST-0500