Question downsizing to a smaller case

[Rock L]

Hi guys
I work as a 3d artist and travel allot in my work lately, the problem is the size and weight of my PC. last time I was flying the flight company was close to not letting me travel with my pc since it was to heavy (with my flightcase the weight is over 30 kilos) .
The case I got now is huge, heavy and got allot of empty space.

Ideally, I would like to have a smal case like lian li q58 or similar but realize I have to get another motherboard and maybe replace other things to fit the small case.
Which smaller motherboard could match the one I currently got in performance and what else would I have to replace to fit the small case?

Thank you.

This is what my PC look like now

Customizations Case : Corsair 678C Exterior Color : White Black Friday Promo:
Processors: Intel Core i9 10850K 10-Core 3.6GHz (5.1GHz TurboBoost)
CPU : CPU Overclocking Motherboard: ASUS ROG Maximus XIII Hero Memory: 64GB CORSAIR VENGEANCE RGB PRO 3200MHz (4x16GB) System Cooling:
CORSAIR iCUE H150i ELITE CAPELLIX LCD Display System Fans: CORSAIR SP120 Elite Performance iCUE RGB controlled by iCUE software
Graphics Cards: NVIDIA 10GB GeForce RTX 3080 Operating System: MS Windows 11 Home Operating System Drive: 240GB Force MP510 NVMe PCIe M.2 SSD RAID : No RAID Hard Drive: 1TB Samsung 870 QVO Series Hard Drive : 1
Power Supply: CORSAIR RM850 SERIES PLUS GOLD PSU Power Supply Sleeved Cable : No Sleeved Cable Audio: Integrated High-Definition Audio Networking: Onboard Network Port

 

[Eximo]

Would really need to know the specific RTX 3080 for size and length. Maxium GPU length in the q58 is 320mm.

CPU cooler will have to go.

4x memory sticks is a problem. Most Mini-ITX only have two slots.

You could possibly build an even smaller setup with a new SFX PSU.

You might take this opportunity to increase the storage size while you are at it. Taking apart a Mini-ITX system can be quite tedious to get at the SSDs.

You are going to lose some top end CPU performance. You may also want to set a strict power limit to keep it in check.

PCPartPicker Part List

CPU: Intel Core i9-10850K 3.6 GHz 10-Core Processor (Purchased For $0.00)
CPU Cooler: Noctua NH-L9x65 33.84 CFM CPU Cooler ($59.95 @ Amazon)
Motherboard: Gigabyte Z590I AORUS ULTRA Mini ITX LGA1200 Motherboard ($193.99 @ Amazon)
Memory: Mushkin Redline 64 GB (2 x 32 GB) DDR4-3200 CL16 Memory ($164.99 @ Amazon)
Video Card: EVGA FTW3 ULTRA GAMING LHR GeForce RTX 3080 10GB LHR 10 GB Video Card (Purchased For $0.00)
Case: Lian Li Q58 (PCIe 4.0) Mini ITX Desktop Case ($119.99 @ Newegg Sellers)
Power Supply: Corsair RM850 850 W 80+ Gold Certified Fully Modular ATX Power Supply (Purchased For $0.00)
Total: $538.92
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2022-11-28 17:00 EST-0500

 

[Rock L]

The Graphics card is GeForce RTX 3080 founder's edition. Thank you for your help with this