These links provide a quick way to access hardware profiles for Intel and Apple Silicon based minis on Low End Mac..
Original Design, PowerPC
Mac mini G4 port configuration
Mac mini G4, Early 2005:
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1.25 GHz and 1.42 GHz, 256 MB RAM, Combo drive standard, 32 MB video RAM.
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Mac mini G4 (Rev. B):
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same speeds, 512 MB RAM standard, Bluetooth 2.0 and AirPort Extreme standard on 1.42 GHz model, 4x SuperDrive configuration added.
Original Design, Intel Core

Back of 2006-07 Mac mini.
Mac mini, Late 2005:
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1.33 GHz and 1.5 GHz, 512 MB RAM (2 GB max), 64 MB video RAM. Top-end model now includes 8x SuperDrive. 5400 rpm drives now standard.
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Mac mini, Core Solo (Early 2006):
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1.5 GHz Core Solo, 512 MB RAM (2 GB max), 64 MB video RAM (shared with system RAM). 4 USB 2.0 ports. 5400 rpm drive standard.
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Mac mini, Core Duo (Early 2006):
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1.66 GHz Core Duo, 512 MB RAM (2 GB max), 64 MB video RAM (shared with system RAM). 4 USB 2.0 ports. Dual-layer SuperDrive. 5400 rpm drive standard.
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Mac mini, Core Duo (Late 2006):
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1.66 and 1.83 GHz, 512 MB RAM (2 GB max), 64 MB video RAM (shared with system RAM). 4 USB 2.0 ports. Top-end model includes dual-layer SuperDrive. 5400 rpm drives standard.
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Mac mini, Core Duo, (Mid 2007):
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1.83 and 2.0 GHz Core 2 Duo, 1 GB RAM (3 GB max), 64 MB video RAM (shared with system RAM). 4 USB 2.0 ports. Top-end model includes dual-layer SuperDrive. 5400 rpm drives standard.

Back of 2009 Mac mini.
Mac mini (Early 2009):
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2.0 GHz, 1 GB/2 GB RAM (8 GB max), Nvidia GeForce 9400M graphics, 5 USB 2.0 ports, FireWire 800 (but not 400), SuperDrive standard, Mini-DVI and Mini DisplayPort, dual display support.
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Mac mini (Late 2009):
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2.26 or 2.53 GHz, 2 GB RAM (8 GB max), Nvidia GeForce 9400M graphics, 5 USB 2.0 ports, FireWire 800, SuperDrive standard, Mini-DVI and Mini DisplayPort, dual display support.
Mac mini, Unibody Aluminum Design
*There is no built-in optical drive with the 2011 and later models.

back of 2010 Mac mini
Mac mini (Mid 2010):
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New unibody design. 2.4 or 2.66 GHz, 2/4 GB RAM (8 GB max), Nvidia GeForce 320M graphics, 4 USB 2.0 ports, FireWire 800, SuperDrive standard, Mini-DVI and Mini DisplayPort, dual display support.

Back of 2011 Mac mini.
Mac mini (Mid 2011):
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2.3 or 2.5 GHz dual-core Intel Core i5, 2/4 GB RAM (8 GB max), integrated Intel HD 3000 Graphics or AMD Radeon HD 6630M graphics, 4 USB 2.0 ports, FireWire 800, Thunderbolt and Mini-DVI, dual display support.
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Mac mini Server (Mid 2011):
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2.0 GHz quad-core Intel Core i7, dual 7200 rpm 500 GB drives standard with SSD options, 4 GB RAM (8 GB max), integrated Intel HD 3000 Graphics, 4 USB 2.0 ports, FireWire 800, Thunderbolt and Mini-DVI, dual display support.
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Mac mini (Late 2012):
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2.5 GHz dual-core i5, 2.3 or 2.6 GHz quad-core i7; 4 GB RAM (16 GB max); 500 GB or 1 TB hard drive, 256 GB SSD, or 1 TB Fusion Drive; 4 USB 3.0 ports, FireWire 800, Thunderbolt, and HDMI.
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Mac mini Server (Late 2012):
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2.3 or 2.6 GHz Core i7; 4 GB RAM (16 GB max); 2 1 TB hard drives or 2 256 GB SSDs; 4 USB 3.0 ports, FireWire 800, Thunderbolt, and HDMI.
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Mac mini (Late 2014):
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1.4, 2.6, or 2.8 GHz dual-core i5, 3.0 GHz dual-core i7; 4 or 8 GB RAM standard, 16 GB maximum only at time of order; 500 GB or 1 TB hard drive, 256 GB/512 GB/1 TB SSD, or 1 TB Fusion Drive; 4 USB 3.0 ports, Thunderbolt, and HDMI.
Mac mini, Unibody Aluminum Gen 2

Late 2018, M1 Pro, M2 Pro Mac mini ports
Mac mini (Late 2018):
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3.6 GHz 4-core i3 or 3.0 GHz 6-core i5 (3.2 GHz 6-core i7 optional), 256/512 GB/1/2 TB SSD, 4 Thunderbolt 3 ports, 2 USB 3.1 Type A ports, HDMI 2.0. 8 GB of memory expandable to 64 GB!
M1, M2 Apple Silicon ports
Developer Transition Kit (A12Z, 2020):
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2.4 GHz 8-core Apple A12Z Bionic, 16 GB 2133 MHz LPDDR4X-4266 SDRAM, 512 GB SSD, available only on loan, discontinued February 3rd 2021.
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Mac mini (M1, 2020):
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3.2 Ghz 8-core M1, 8/16 GB 2133 MHz LPDDR4X-4266 SDRAM, 256/512 GB PCIe SSD, 7/8 Core GPU
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Mac mini (M2, 2023):
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3.49 Ghz 8-core M2, 8/16/24 GB 3200 MHz LPDDR5X-6400 SDRAM, 256/512GB/1/2TB PCIe SSD, 10 Core GPU, 10G ethernet optional
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Mac mini (M2 Pro, 2023):
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3.49 Ghz 10/12-core M2, 16/32 GB 3200 MHz LPDDR5X-6400 SDRAM, 512GB/1/2/4/8TB PCIe SSD, 16 Core GPU, 10G ethernet optional
M4 Apple Silicon Design
Mac mini (M4, 2024):
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4.4 Ghz 10-core M4, 16/24/32 GB 3750 MHz LPDDR5X-7500 SDRAM, 512GB/1/2TB PCIe SSD, 10 Core GPU, 10G ethernet optional, 256GB SSD base
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Mac mini (M4 Pro, 2024):
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4.4 Ghz 12-core M4, 24/32/64 GB 3750 MHz LPDDR5X-7500 SDRAM, 1/2/4/8TB PCIe SSD, 16/20 Core GPU, 10G ethernet optional, 512GB SSD base