My dream PC; a once in a lifetime opportunity: my wife's gift to me for finishing my PhD and finally leaving graduate school.
CPU
AMD Ryzen 9 7950X3D
Cooler
Custom watercooling loop with Corsair Hydro X product line. Full CPU and GPU waterblocks and 2x 420mm rads
GPU
MSI Gaming X Trio Geforce RTX 4090 24GB
RAM
Corsair Dominator Platinum 32 GB DDR5-6200 CL36
Storage
2x Samsung 980 Pro 2TB M.2-2280 PCIE 4.0
Motherboard
MSI Pro X670-P WIFI ATX AM5
PSU
Corsair 1250 W 80+ Platinum
Case
Corsair iCUE 7000X RGB White
Mouse
Corsair M65 RGB Elite
Keyboard
Corsair K70 RGB MK.2 SE
Monitor
2x Acer 27" 3840x2160 @120Hz
Headphones
Corsair Virtuoso RGB

PCPartPicker List [pcpartpicker.com]

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Originally built in 2013, with an AMD HD 7970 GHz 3 GB GPU, 8 GB of RAM, one monitor, and a different motherboard (ASUS P8Z77-V that I had to return).
CPU
Intel i5-3570k 4 cores overclocked to 4 GHz
CPU Cooler
Cooler Master Hyper 212 EVO
GPU
NVIDIA GTX 1650 Super 4 GB
RAM
Corsair Vengeance 16 GB DDR3-1600 CL9
Storage
Crucial M4 128 GB SSD
Seagate Barracuda 2 TB 7200 RPM HDD
Seagate Barracuda 3 TB 7200 RPM HDD
Motherboard
ASRock Z77 Extreme 4
PSU
XFX 850 W 80+ Gold
Case
Corsair 600T - White
Mouse
Logitech G500
Keyboard
Microsoft Sidewinder X4
Monitor
2x Asus 23.6" 1920x1080 @60Hz


PCPartPicker List [pcpartpicker.com]