Dell OptiPlex 9020 Core i5-4570 Quad-Core 3.2GHz 4GB 500GB Windows 10 

• General Features:
• Small Form Factor design
• 4th Gen Intel Core i5-4570 Quad-Core 3.2GHz processor
• 3.6GHz Max Turbo Frequency, 6MB Smart Cache, 5GT/s DMI2
• 4GB DDR3 RAM
• 500 GB SATA hard drive
• Integrated HD audio
• Intel HD Graphics 4600
• without DVD Room.
• Integrated 10/100/1000 Gigabit Ethernet LAN
• 255-watt power supply
• 10 USB Ports

Dell OptiPlex 7010   Core i5-3570 Quad-Core 3.40 GHz 4GB 500GB Windows 10  64-bit

• General Features:
• Small Form Factor design
• 4th Gen Intel Core i5-3570 Quad-Core 3.40GHz processor
• 3.8 GHz Max Turbo Frequency, 6MB Smart Cache, 5GT/s DMI2
• 4GB DDR3 RAM
• 500 GB SATA hard drive
• Integrated HD audio
• Intel HD Graphics 4600
• without DVD Room.
• Integrated 10/100/1000 Gigabit Ethernet LAN
• 255-watt power supply
• 10 USB Ports