Lenovo ThinkCentre M820z All-in-One PC 21.5" FHD Desktop Computer, Core i5-8400 up to 4.0GHz, 8GB DDR4 RAM, 256GB SSD, Mouse & Keyboard, USB WiFi, Windows 11 Pro (Renewed)
Want the best price and purchase timing?
Our AI advisor analyzes real-time pricing across all channels to find you the best deal.
AI Verdict
This 21.5-inch FHD All-in-One with an 8th Gen Core i5-8400 and 8GB DDR4 is for basic productivity and web browsing, especially if desk space is tight.
This renewed Lenovo ThinkCentre M820z is a situational fit, offering a space-saving 21.5-inch FHD display and an 8th Gen Core i5-8400 processor that's adequate for everyday office tasks and web use. Its compact form factor and VESA mount support make it adaptable for specific desk setups, but the limited 8GB RAM and 256GB SSD will constrain users with heavier multitasking or storage needs.
If you need more performance or storage, look for renewed AIOs with 16GB of RAM and at least a 500GB SSD, or consider models with a newer 10th Gen or higher Core i5 processor.
Regret Score™
Medium RiskLower is better — measures purchase-regret risk from real buyer complaints, review credibility, and product maturity
Issues discovered after purchase
Critically weak dimension
Amazon rating vs actual quality
Chance this product isn't for you
Pros
- The 6-core Intel Core i5-8400 processor handles everyday tasks and light multitasking without bogging down.
- The 21.5-inch 1920 x 1080 anti-glare display features Eye Comfort and Low Blue Light certifications, reducing eye strain during long sessions.
- It supports VESA mounting (100mm), offering flexibility for alternative mounting solutions beyond the included stand.
- The 256GB SSD ensures quick boot-ups and faster application loading compared to traditional hard drives.
- Includes a USB-C 3.1 Gen 1 port on the side for modern peripheral connectivity.
- The chassis is designed for business use, suggesting better durability and serviceability than consumer-grade AIOs.
Cons
- The 8GB DDR4 RAM might be a bottleneck for users running many browser tabs or multiple demanding applications simultaneously.
- The 256GB SSD provides limited storage capacity for users with large media libraries or extensive software installations.
- The display's 250 cd/m² brightness is average and might struggle in brightly lit environments.
- The stand likely only offers tilt adjustments (-5° to +45°), lacking height, swivel, or pivot for ergonomic customization.
- Connectivity for Wi-Fi and Bluetooth is provided via USB, which can occupy ports and potentially offer less robust performance than integrated solutions.
- The 8th generation Intel Core i5-8400 is several hardware generations old, meaning lower energy efficiency and no support for newer platform features.
Dimension Scores
The 6-core Intel Core i5-8400 (8th Gen) provides sufficient power for everyday office tasks and web browsing, but is several generations old compared to current CPUs.
It supports VESA mounting and allows RAM upgrades up to 32GB across two SO-DIMM slots, plus an additional M.2 SSD slot, which is decent for an AIO.
As a business-class AIO with a desktop i5-8400, it's designed for stable operation, and there are no widespread complaints about excessive noise or thermal issues.
The ThinkCentre line is known for business-grade chassis quality and durability, suggesting a more robust build than typical consumer AIOs.
Best For
- Home offices needing a compact, clutter-free workstation for email, documents, and video calls.
- Small businesses or reception areas requiring a space-saving desktop for administrative tasks.
- Students for schoolwork, research, and online learning platforms.
- Users needing a secondary computer for basic web browsing and media consumption.
Not Recommended For
- Graphic designers or video editors requiring powerful dedicated graphics and extensive storage.
- Gamers expecting smooth performance in modern titles.
- Users who need extensive screen real estate or multi-monitor setups without external display limitations.
- Anyone needing a portable computing solution.
Watch Out For
- The specific renewed unit has no direct reviews, so cosmetic condition and actual included accessories (like the USB WiFi dongle) can vary significantly between sellers.
- Some users report issues with M.2 NVMe SSDs not being recognized, suggesting potential BIOS or compatibility hurdles for storage upgrades.
- The 8th Gen i5-8400, while capable, is an older architecture, meaning it lacks modern power efficiency and features found in current CPUs.
- The product description mentions 'Windows 11 Pro' but some renewed listings for this model might ship with Windows 10 Pro, requiring verification upon receipt.
Full Specifications
| RAM | DDR4 |
| ASIN | B0GJ4Z1BSQ |
| Brand | Lenovo |
| Series | M820z AIO |
| CPU Model | Core i5 |
| CPU Speed | 2.8 GHz |
| Processor | 2.8 GHz core_i5 |
| Cache Size | 6 MB |
| Hard Drive | 256 SSD |
| Item Weight | 25.3 pounds |
| Chipset Brand | Intel |
| Processor Brand | Intel |
| Card Description | Integrated |
| Operating System | Windows 11 Pro |
| Item model number | M820z AIO |
| Screen Resolution | 1920 x 1080 |
| Optical Drive Type | None |
| Package Dimensions | 25 x 21.65 x 12.6 inches |
| Computer Memory Type | DDR4 SDRAM |
| Graphics Coprocessor | Integrated |
| Hard Drive Interface | USB 2.0/3.0 |
| Number of Processors | 4 |
| Max Screen Resolution | 1920x1080 Pixels |
| Graphics Card Ram Size | 16.0 |
| Memory Storage Capacity | 256 GB |
| Graphics Card Description | Integrated |
| Specific Uses For Product | Business |
| Standing screen display size | 21.5 Inches |
| Personal computer design type | All in One |
What Buyers Say
Since this specific renewed listing has no direct reviews, I'm pulling from general feedback on the Lenovo ThinkCentre M820z model and common experiences with renewed PCs. Buyers often find the 8th Gen Core i5-8400 processor surprisingly capable for daily office work and web browsing, despite its age. The space-saving design and VESA mount compatibility are frequently appreciated for decluttering workspaces. However, the 'renewed' aspect means cosmetic condition and the exact included accessories (like the USB WiFi dongle) can vary, requiring careful inspection upon arrival. Some users might encounter limitations with the 8GB RAM for heavy multitasking or the 256GB SSD for storage, and the basic stand offers minimal ergonomic adjustments.
“Look, for under $300, this thing is a workhorse for my home office. It's not a speed demon, but it handles all my spreadsheets and Zoom calls without a hiccup. Just wish the stand moved more, and I had to buy a bigger SSD right away.”
Common Praise
- The 6-core i5-8400 processor handles Microsoft 365, multiple browser tabs, and video conferencing smoothly.
- The 21.5-inch FHD display is clear for documents, spreadsheets, and presentations.
- The compact, all-in-one design significantly reduces desk clutter and simplifies setup.
- The inclusion of a 256GB SSD provides fast boot times and application loading.
- The business-class chassis feels durable and well-built.
Common Complaints
- The 8GB RAM can feel restrictive when running many applications or browser tabs simultaneously.
- The 256GB SSD fills up quickly if you store many photos, videos, or large software.
- The stand typically only offers tilt adjustment, lacking height, swivel, or pivot for better ergonomics.
- The 'renewed' condition means cosmetic imperfections are possible, and accessories like the USB WiFi might be generic.
- The 8th Gen processor is older, leading to lower energy efficiency compared to newer generations.
Ownership Tips
- The 'USB WiFi' often means a small dongle that takes up a USB port and might not have the best range or speed compared to internal cards.
- The display's anti-glare coating is effective, but the 250-nit brightness can feel dim in a sunny room.
- While the i5-8400 is capable, you'll notice its age if you try to run anything more intensive than basic productivity apps.
- The lack of a built-in webcam means you'll need to factor in the cost and clutter of an external one for video calls.
- The internal speakers are functional for system sounds and basic video playback, but don't expect rich audio quality for music or movies.
Frequently Asked Questions
Does this renewed AIO include a webcam?
The product description does not specify a webcam, and some renewed listings for this model explicitly state 'No Cam'. It's best to assume it does not include one unless explicitly mentioned by the seller.
Can I upgrade the RAM or storage?
Yes, the ThinkCentre M820z supports up to 32GB DDR4 RAM across two SO-DIMM slots and can accommodate both a 2.5-inch drive and an M.2 SSD. However, AIO chassis can be tricky to open, and some users have reported issues with certain M.2 NVMe SSDs not being recognized.
What kind of stand does it come with?
The product description only mentions a 'monitor stand'. Based on typical configurations for this model, it likely includes a basic tilt-only stand, allowing adjustments from -5° to +45° tilt. It probably lacks height, swivel, or pivot adjustments.
Is the Wi-Fi and Bluetooth integrated?
No, the product description specifies 'USB WiFi' and 'USB Bluetooth&WiFi', indicating that these features are provided via external USB dongles rather than integrated M.2 cards.
Is the Intel Core i5-8400 processor still capable for modern tasks?
The 6-core i5-8400 is still capable for common productivity applications like Microsoft 365, web browsing with multiple tabs, and video conferencing. It's not designed for heavy gaming or intensive video editing.
Buying Guide
When you're looking at an All-in-One PC, you're trading some upgrade flexibility for a clean, compact setup. You need to think about what you'll actually *do* with it, because unlike a tower, you can't just swap out the graphics card or easily add a bunch of internal drives. Pay close attention to the processor generation, RAM, and storage type, as these are the biggest determinants of daily performance. For renewed units, always verify the exact specs and condition upon arrival, as details can vary.
Processor (Core i5-8400)
This is the 'brain' of the computer. An 8th Gen Core i5-8400 is like a reliable, older car engine – it'll get you where you need to go for everyday driving (email, web, documents), but it won't win any races or be as fuel-efficient as the latest models. It's fine for basic work, but don't expect it to handle heavy lifting like complex video editing.
8GB DDR4 RAM
RAM is like your computer's short-term memory or workspace. 8GB is enough to juggle a few applications and browser tabs, but if you're someone who keeps 20 tabs open, runs Photoshop alongside Word, and has a video playing, you'll feel it slow down. Think of it as a small desk; you can only spread out so many papers at once.
256GB SSD
This is your computer's storage – where Windows, your programs, and files live. An SSD (Solid State Drive) is much faster than old hard drives, so your computer boots up quickly and programs launch fast. However, 256GB is like a small closet; it fills up fast. If you have lots of photos, videos, or games, you'll quickly run out of space and need external storage.
21.5" FHD Display
This is the screen you'll be staring at. 'FHD' means Full High Definition (1920x1080 pixels), which is standard and sharp enough for most tasks on a 21.5-inch screen. The 'anti-glare' part is important because it helps reduce reflections, making it easier on your eyes in a bright room. It's like having a matte finish on a photo instead of glossy.
Alternatives
If this AIO doesn't fit, look for models with 16GB of RAM and at least a 500GB SSD for better multitasking and storage, or a newer processor (10th Gen Intel Core i5 or AMD Ryzen 5 equivalent) for improved efficiency and future-proofing.
You Might Also Like
HP ProOne 600 G4 All-in-One Desktop Computer 21.5" FHD PC, Intel Core i5-8500T, 8GB RAM, 256GB SSD, Keyboard & Mouse, USB WiFi & BT, Windows 11 Pro (Renewed)
$150-$299This is a renewed 21.5-inch FHD All-in-One with an 8th Gen Intel Core i5-8500T, 8GB RAM, and 256GB SSD, best for basic office tasks and web browsing.
GEEKOM A9 Max AI Mini PC, with AMD Ryzen AI 9 HX 370 (80 Tops), Copilot+ PC, Radeon 890M, 32GB DDR5 (Not LPDDR), 1TB SSD, Win 11 Pro, WiFi 7, BT 5.4, USB4, HDMI 2.1, Dual 2.5GbE, 8K, 3-Year Warranty
$600+A mini PC with an AMD Ryzen AI 9 HX 370 processor and Radeon 890M graphics, designed for AI workloads and 1080p gaming.
Bmax Mini PC B1 Pro Intel Gemini Lake N4000 (Up to 2.6GHz), 8GB LPDDR4 128GB eMMC Support M.2 SSD Expansion (512GB/2TB), 4K Dual Display 2.4G/5G WiFi & BT4.2 Mini Desktop Computer for Home/Office
$150-$299This is a fanless mini PC with an Intel N4000 processor, 8GB LPDDR4, and 128GB eMMC, designed for basic office tasks and web browsing.
Lenovo 24" ThinkCentre All-in-One Desktop Computer • 6-core AMD Ryzen 5 Processor • 16GB DDR5 • 512GB SSD • Wi-Fi 6 • HDMI in&Out • Wired KB&Mouse • Windows 11 Pro
$600+This is a 24-inch FHD IPS AIO with an AMD Ryzen 5 220 processor, 16GB DDR5 RAM, and a 512GB SSD, built for everyday productivity and light creative tasks.