Help with CAD and Gaming Rig ($5000 limit)

Balls-to-the-wall best build you can get for workstation tasks that isn't running a Xeon CPU or Quadro GPU.

Type	Item	Price
CPU	Intel Core i9-12900KS 3.4 GHz 16-Core Processor	$636.99 @ Amazon
CPU Cooler	Noctua NH-D15 82.5 CFM CPU Cooler	$99.95 @ Amazon
Motherboard	Gigabyte Z690 UD AX DDR4 ATX LGA1700 Motherboard	$189.99 @ Newegg
Memory	*Mushkin Redline Lumina 64 GB (2 x 32 GB) DDR4-3600 CL16 Memory	$249.99 @ Amazon
Memory	*Mushkin Redline Lumina 64 GB (2 x 32 GB) DDR4-3600 CL16 Memory	$249.99 @ Amazon
Storage	Seagate FireCuda 520 2 TB M.2-2280 NVME Solid State Drive	$179.99 @ Newegg
Storage	Western Digital Blue 8 TB 3.5" 5640RPM Internal Hard Drive	$119.99 @ Newegg
Video Card	*MSI GeForce RTX 3090 Ti 24 GB GAMING X TRIO Video Card	$1149.99 @ Amazon
Case	Deepcool MATREXX 55 MESH ATX Mid Tower Case	$58.76 @ Amazon
Power Supply	be quiet! Straight Power 11 1200 W 80+ Platinum Certified Fully Modular ATX Power Supply	$243.94 @ Amazon
Case Fan	*Noctua P14r redux-1500 PWM 78.69 CFM 140 mm Fan	$14.95 @ Amazon
Case Fan	*Noctua P14r redux-1500 PWM 78.69 CFM 140 mm Fan	$14.95 @ Amazon
Case Fan	*Noctua P14r redux-1500 PWM 78.69 CFM 140 mm Fan	$14.95 @ Amazon
Case Fan	*Noctua P14r redux-1500 PWM 78.69 CFM 140 mm Fan	$14.95 @ Amazon
Case Fan	*Noctua P12 redux-1700 PWM 70.75 CFM 120 mm Fan	$14.90 @ Amazon
	Prices include shipping, taxes, rebates, and discounts
	Total	$3254.28
	*Lowest price parts chosen from parametric criteria
	Generated by PCPartPicker 2022-08-30 17:00 EDT-0400

Best-in-market CPU, CPU cooler, and GPU
Fantastic top-tier mobo with excellent VRMs
128 GB super fast RAM
2 TB Gen4 NVMe SSD + excellent value 8 TB HDD
Awesome airflow case + 5 Noctua fans (2 front intake, 2 top exhaust, 1 rear exhaust)
Top-tier PSU with multi-rail switching and modular cabvling

You can also scale back the CPU slightly and the GPU a bit, and end up with like 95% of the performance while saving close to $900:

Type	Item	Price
CPU	Intel Core i9-12900F 2.4 GHz 16-Core Processor	$497.99 @ Amazon
CPU Cooler	Thermalright Peerless Assasin 120 SE 66.17 CFM CPU Cooler	$35.90 @ Amazon
Motherboard	MSI MAG B660 TOMAHAWK WIFI DDR4 ATX LGA1700 Motherboard	$189.99 @ Amazon
Memory	*Mushkin Redline Lumina 64 GB (2 x 32 GB) DDR4-3600 CL16 Memory	$249.99 @ Amazon
Memory	*Mushkin Redline Lumina 64 GB (2 x 32 GB) DDR4-3600 CL16 Memory	$249.99 @ Amazon
Storage	*PNY XLR8 CS3030 2 TB M.2-2280 NVME Solid State Drive	$129.99 @ Amazon
Video Card	*PNY GeForce RTX 3080 12GB LHR 12 GB XLR8 Gaming REVEL EPIC-X RGB Video Card	$749.99 @ B&H
Case	Deepcool MATREXX 55 MESH ATX Mid Tower Case	$58.76 @ Amazon
Power Supply	Phanteks AMP 1000 W 80+ Gold Certified Fully Modular ATX Power Supply	$127.99 @ Amazon
Case Fan	NZXT Aer P 98.17 CFM 140 mm Fan	$7.99 @ Amazon
Case Fan	NZXT Aer P 98.17 CFM 140 mm Fan	$7.99 @ Amazon
Case Fan	NZXT Aer P 98.17 CFM 140 mm Fan	$7.99 @ Amazon
Case Fan	NZXT Aer P 98.17 CFM 140 mm Fan	$7.99 @ Amazon
Case Fan	ARCTIC P12 56.3 CFM 120 mm Fan	$7.95 @ Amazon
	Prices include shipping, taxes, rebates, and discounts
	Total	$2330.50
	*Lowest price parts chosen from parametric criteria
	Generated by PCPartPicker 2022-08-30 16:59 EDT-0400

The "locked" version of the same CPU, without integrated graphics included
Best value CPU cooler on the market right now
Value-oriented mobo with excellent VRMs, but does not support overclocking
Same RAM
2 TB NVMe SSD - the cheapest available
Drop down 3090 Ti to 3080 12 GB - performance is close, and you save quite a lot of money. If this wasn't a workstation build, I would go AMD here, but I bet the CUDA cores will come into play.
Same case but with far better value case fans
Much better value PSU with excellent reviews and reliability