I currently run 3 hard drives. How many hard drives can be added in addition to the one that comes with it?

Hi, It is easy to add a 2.5" drive below the DVD. The wiring is there, with the exception of a SATA cable. To add a 3rd drive would require some creativity.

Does this come with windows 7 pro? Can I easily upgrade to windows 10 pro?

Yes, it has Windows 7 on it. It does not come with Windows 10 media, but instead directs you to context Lenovo if you want to buy a copy of it. You don't need to though, if you download the Windows 10 media creation tool from Microsoft, that can get you the installation media needed for free.

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Lenovo Desktop Computer ThinkCentre M800 (10FY0017US) Intel Core i7-6700 8GB DDR4 1TB HDD Intel HD Graphics 530 Windows 7 Professional 64-Bit (Windows 10 Pro Downgrade)

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Intel Core i7-6700
8GB DDR4
1TB HDD
Windows 7 Professional 64-Bit (Windows 10 Pro Downgrade)
No Screen
Intel HD Graphics 530

Overview

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Model
Brand	Lenovo
Series	ThinkCentre
Model	M800 (10FY0017US)
Part Number	10FY0017US

Quick Info
Type	Business Desktops & Workstations
Form Factor	Slim/Small Form Factor
Usage	Business
Processor	Intel Core i7-6700 3.4 GHz
Memory	8 GB DDR4 2133
Storage	1 TB 7200 RPM
Optical Drive	DVDRW
Graphics	Intel HD Graphics 530
Ethernet	Gigabit Ethernet
Power Supply	210W
Operating System	Windows 7 Professional 64-Bit (Windows 10 Pro Downgrade)

Motherboard
Chipset	Intel Q150

CPU
CPU Type	Intel Core i7 6th Gen
CPU Name	Intel Core i7-6700
L3 Cache Per CPU	8 MB
CPU Main Features	64 bit Quad-Core Processor

Graphics
GPU/VGA Type	Intel HD Graphics 530
Graphics Interface	Integrated video

Memory
Memory Capacity	8GB DDR4
Memory Speed	DDR4 2133
Form Factor	DIMM 288-pin
Memory Spec	8 GB x 1
Memory Slot (Total)	4
Memory Slot (Available)	3
Maximum Memory Supported	64 GB

Storage
HDD	1TB
HDD Interface	SATA III
HDD RPM	7200rpm

Optical Drive
Optical Drive Type	DVD±RW

Display
Screen Size	No Screen

Communications
LAN Speed	10/100/1000Mbps

Front Panel Ports
Front USB	2 x USB 3.0
Front Audio Ports	1 x Microphone, 1 x Headphone

Back Panel Ports
COM	1 x Serial (9-pin) Port
Video Ports	1 VGA, 2 Display Ports
Rear USB	4 x USB 3.0 2 x USB 2.0
RJ45	1 port
Rear Audio Ports	3 ports

Expansion
PCI Slots (Available/Total)	1 PCI Express 3.0 x16 (45W max) 1 PCIe 3.0 x1 1 PCIe 3.0 x16 (x4 elec, 45W max)

Keyboard
Keyboard Type	USB Keyboard

Mouse
Mouse Type	USB Mouse

Dimensions & Weight
Dimensions (H x W x D)	13.31" x 3.46" x 14.05"
Weight	12.30 lbs.

Additional Information
First Listed on Newegg	September 22, 2025

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Lenovo Desktop Computer ThinkCentre M800 (10FY0017US) Intel Core i7-6700 8GB DDR4 1TB HDD Intel HD Graphics 530 Windows 7 Professional 64-Bit (Windows 10 Pro Downgrade)

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Item#: 9SIAFJ8KKP4520

Meet Your Seller

Lenovo Desktop Computer ThinkCentre M800 (10FY0017US) Intel Core i7-6700 8GB DDR4 1TB HDD Intel HD Graphics 530 Windows 7 Professional 64-Bit (Windows 10 Pro Downgrade)

Learn more about the Lenovo M800 (10FY0017US)

Customer Reviews of the Lenovo M800 (10FY0017US)

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info