Quick summary: The HP ProOne 400 G4 20″ All-in-One is a professionally refurbished business all-in-one PC with Intel Core i5-8500T with 6 cores / 6 threads, up to 3.5 GHz, 16GB RAM, 512GB SSD and a 19.5″ HD+ (1600 x 900) anti-glare display. Best for: reception desks, offices, schools and cyber cafés.

Overview

The HP ProOne 400 G4 20″ All-in-One (2018) is a business all-in-one PC from HP. This configuration pairs the Intel Core i5-8500T with 16GB RAM and a 512GB SSD. Its 19.5″ HD+ (1600 x 900) anti-glare screen and approx. 5.3 kg weight make it comfortable for long working days. Each unit is professionally refurbished – cleaned, fully tested and ready to use – so you get business-class build quality for far less than a new machine.

Key features

Processor: Intel Core i5-8500T – 6 cores / 6 threads, up to 3.5 GHz
Memory: 16GB RAM – upgradeable
Storage: 512GB SSD – fast boot and app loading
Display: 19.5″ HD+ (1600 x 900) anti-glare
Space-saving all-in-one – just one power cable
6-core 8th Gen i5 with 16GB RAM and 512GB SSD
Built-in speakers

HP ProOne 400 G4 20″ All-in-One full specifications

Processor & graphics

Processor	Intel Core i5-8500T
Generation	8th Gen (Coffee Lake, desktop T-series)
Cores / threads	6 cores / 6 threads
Base clock speed	2.1 GHz
Max turbo speed	3.5 GHz
Cache	9 MB Intel Smart Cache
Processor power (TDP)	35 W
Integrated graphics	Intel UHD Graphics 630

Memory & storage

Memory (RAM)	16GB RAM
RAM upgrades	2x DDR4 SO-DIMM slots (upgradeable to 32GB)
Storage	512GB SSD
Storage interface	M.2 / 2.5″ SATA SSD

Display

Display	19.5″ HD+ (1600 x 900) anti-glare
Touchscreen	No

Connectivity & ports

Wireless	Wi-Fi 5 + Bluetooth (most units)
Ports	Side: USB-A 3.1, audio; Rear: 4x USB-A, DisplayPort out, RJ-45 Ethernet

Camera, audio & input

Webcam	Integrated pop-up/720p webcam (most units)
Keyboard	Keyboard and mouse may vary
Security	TPM 2.0

Battery & power

Charger	Integrated / external HP adapter

Design

Weight	approx. 5.3 kg
Form factor	Business all-in-one PC

Software, condition & warranty

Condition	Professionally refurbished – cleaned, fully tested and ready to use

How it compares

How the HP ProOne 400 G4 20″ All-in-One stacks up against similar machines buyers in Kenya often compare it with (all available from Computer Accessories Kenya):

Model	Processor	RAM / storage	Display	Weight	Stand-out feature
HP ProOne 400 G4 20″ All-in-One (this item)	Core i5-8500T	16GB / 512GB SSD	19.5″ HD+ (1600 x 900) anti-glare	approx. 5.3 kg	Space-saving all-in-one – just one power cable
Lenovo IdeaCentre AIO 3 24IMB05 23.8″ All-in-One	Core i5-10500T	8GB / 256GB SSD	23.8″ Full HD (1920 x 1080) IPS	approx. 5.6 kg	Big 23.8-inch Full HD IPS screen
Lenovo IdeaCentre S4430 23.8″ All-in-One	Core i5 10th Gen	8GB / 256GB SSD	23.8″ Full HD (1920 x 1080)	—	Big 23.8-inch Full HD screen

Verdict: the HP ProOne 400 G4 20″ All-in-One stands out for: Space-saving all-in-one – just one power cable. It is the right pick for reception desks, offices, schools and cyber cafés.

Who it’s for

Microsoft Office, email and web browsing
Zoom, Teams and Google Meet calls
Online classes, research and assignments
Office, reception, school labs and point-of-sale stations

What’s in the box

HP ProOne 400 G4 20″ All-in-One computer
Power adapter / charger

Frequently asked questions

What processor does the HP ProOne 400 G4 20″ All-in-One have and how fast is it?

This unit has the Intel Core i5-8500T, an 8th Gen (Coffee Lake, desktop T-series) chip with 6 cores and 6 threads. It boosts up to 3.5 GHz, with 9 MB of cache.

Can I upgrade the RAM or storage on the HP ProOne 400 G4 20″ All-in-One?

Yes – 2x DDR4 SO-DIMM slots (upgradeable to 32GB). Storage uses M.2 / 2.5″ SATA SSD, so you can fit a larger SSD later.

Who is the HP ProOne 400 G4 20″ All-in-One best for?

Reception desks, offices, schools and cyber cafés. It handles Office, browsing, video calls and online learning with ease; it is not designed for heavy gaming.

What condition is this refurbished unit in?

It is professionally refurbished: cleaned, fully tested and ready to use, so you get a business-grade machine at a fraction of its original price.

Do you deliver in Nairobi and across Kenya?

Yes. Computer Accessories Kenya offers free delivery within Nairobi for orders of up to 5 items, and countrywide delivery to all counties from KSh 500 depending on location. Returns are accepted within 7 days.

Buy the HP ProOne 400 G4 20″ All-in-One in Kenya

Order online from Computer Accessories Kenya (computeraccessories.co.ke) and pay securely at checkout. We offer free delivery within Nairobi for orders of up to 5 items, countrywide delivery from KSh 500 depending on your county, and 7-day returns. Need help choosing? Contact our team before you order.

HP ProOne 400 G4 20″ All-in-One

HP ProOne 400 G4 20″ All-in-One – Core i5 8th Gen, 16GB RAM, 512GB SSD (Refurbished)