27" iMac mid 2011
Running High Sierra, can also run windows 10, (11 also if you know what you're doing)
I ran both OSX and Windows on the machine.
Primarily used for 3D design (Z Brush, Fusion 360)
Has been upgraded to a 500GB Solid State Drive, and 32GB of Ram.
Absolute work horse of a machine.
Included is an Apple wireless Keyboard, a magic mouse, and included is a Thunderbolt to HDMI adapter to add a separate monitor if desired.
Specs are as follows
iMac (27-inch, Mid 2011) - Technical Specifications
Display
27-inch (viewable) LED-backlit glossy widescreen TFT display with support for millions of colors
Resolution: 2560 by 1440 pixels
Processor
2.7GHz quad-core Intel Core i5 with 6MB on-chip shared L3 cache
Memory
32GB (four 8GB) of 1333MHz DDR3 memory.
Storage
500GB SSD
SATA
Graphics
2.7 GHz
AMD Radeon HD 6770M graphics processor with 512MB of GDDR5 memory
Video Support and Camera
FaceTime HD camera
Simultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external display
Support for extended desktop and video mirroring modes
Audio
Built-in stereo speakers
Two internal 17-watt high-efficiency amplifiers
Headphone/optical digital audio output (minijack)
Audio line in/optical digital audio input (minijack)
Built-in microphone
Support for Apple iPhone headset with microphone
Connections and Expansion
Two Thunderbolt ports
Mini DisplayPort output with support for DVI, VGA, and dual-link DVI (adapters sold separately)
One FireWire 800 port; 7 watts
Four USB 2.0 ports
SDXC card slot
Slot-loading 8x SuperDrive with 4x double-layer burning (DVD±R DL/DVD±RW/CD-RW)
Audio in/out
10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)
IR receiver
Input
Apple Wireless Keyboard
Magic Mouse
Wireless
Wi-Fi
802.11n Wi-Fi wireless networking;2 IEEE 802.11a/b/g compatible
Bluetooth
Bluetooth 2.1 + EDR (Enhanced Data Rate) wireless technology
Size and Weight
Height: 20.4 inches (51.7 cm)
Width: 25.6 inches (65.0 cm)
Depth: 8.15 inches (20.7 cm)
Weight: 30.5 pounds (13.8 kg)3
Electrical and Operating Requirements
Line voltage: 100-240V AC
Frequency: 50Hz to 60Hz, single phase
Maximum continuous power: 310W
Operating temperature: 50° to 95° F (10° to 35° C)
Storage temperature: -4° to 116° F (-20° to 47° C)
Relative humidity: 5% to 95% noncondensing
Maximum altitude: 10,000 feet
Typical acoustical performance
Sound pressure level (operator position): 18 dBA at idle4