Buying Guide
The Best Monitors for Machine Learning
From the 27US500 to the S2725QC: five monitors ranked on refresh rate and screen size, with who should skip each one.
By The PC Journal editorial team
12 min read5 products evaluated
Machine learning work means notebooks, logs and plots side by side, so pixel density matters more than refresh rate. Every pick is 27 inches or larger at 4K or higher, ordered from the lowest price.
We sorted these picks by refresh rate, resolution and size, working from the makers' own data; nothing here was tested in-house, and if a maker skips refresh rate, the guide says so.
Quick Picks
Our 5 recommendations at a glance. Tap a pick for the full verdict.
Lowest Price Here
LG UltraFine 27US500-W
Undercutting the ViewFinity S70H on price when we checked.
Best for: Keeping the budget tight.
Our take Check price for LG UltraFine 27US500-W (opens in a new tab)
Also Consider
Samsung ViewFinity S7 (S70H) 27-inch
A built-in KVM switch for two computers.
Best for: Buyers who want built-in KVM switch for two computers.
Our take Check price for Samsung ViewFinity S7 (S70H) 27-inch (opens in a new tab)
Fastest Refresh
CUNPU 27-inch 4K 160Hz
The highest refresh rate here (160Hz).
Best for: Competitive shooters where motion clarity matters most.
Our take Check price for CUNPU 27-inch 4K 160Hz (opens in a new tab)
Largest Screen Size
Samsung 43-inch M70H Mini LED Smart TV
The largest screen size here (43 inches).
Best for: Buyers who put screen size first.
Our take Check price for Samsung 43-inch M70H Mini LED Smart TV (opens in a new tab)
Premium Pick
Dell 27 S2725QC 4K USB-C
The highest-priced pick here at the time of writing, with USB-C with up to 65W power delivery.
Best for: Buyers who want the most complete package.
Our take Check price for Dell 27 S2725QC 4K USB-C (opens in a new tab)
Our Picks
Lowest Price Here1 of 5
LG UltraFine 27US500-W on Amazon (opens in a new tab)
The 27US500 offers 90% DCI-P3 coverage and HDR10 input on an IPS panel in a white finish.
Best for
- Keeping the budget tight.
Skip if
- Look at the others if this bothers you: hDR10 support without a DisplayHDR certification.
Why we like it
It suits creative work more than gaming. It matches the ViewFinity S70H, the CUNPU 4K and the S2725QC on screen size (27 inches). It shares an IPS panel with the S2725QC; the CUNPU 4K goes with a fast IPS panel.
It shares an HDR10 with the ViewFinity S70H; the Samsung M70H goes with a mini LED HDR. A 90% DCI-P3 color gamut is unique to it among these picks, while the S2725QC uses a 99% sRGB color gamut. It also offers a white borderless design and a Reader Mode.
At 4K, check that your graphics card and cable support 4K at the refresh rate you want before you buy. No other pick here cost less at our last price check, and the ViewFinity S70H was closest. If you want a confirmed refresh rate, look to the CUNPU 4K instead: it offers 160Hz, while this one gives no figure.
Key dimensions & specs
- Resolution: 3840x2160 (4K)
- Size: 27 inches
- Panel: IPS
- HDR: HDR10
- Color gamut: 90% DCI-P3
Pros
- 4K resolution for sharp text and detail
- an IPS panel with wide viewing angles
- 90% DCI-P3 colour coverage
- White borderless design
Cons
- HDR10 support without a DisplayHDR certification
- No published refresh rate
Also Consider2 of 5
Samsung ViewFinity S7 (S70H) 27-inch on Amazon (opens in a new tab)
The ViewFinity S70H adds a KVM switch, so one keyboard and mouse can control two computers.
Best for
- Buyers who want built-in KVM switch for two computers.
Skip if
- Look at the others if this bothers you: hDR10 support without a DisplayHDR certification.
Why we like it
TÜV-certified Eye Saver mode cuts blue light and flicker, and 178-degree viewing angles keep brightness even. On screen size it ties with the 27US500, the CUNPU 4K and the S2725QC at 27 inches. Like the 27US500, it has an HDR10, while the CUNPU 4K uses an HDR400.
At 4K, check that your graphics card and cable support 4K at the refresh rate you want before you buy. On price it sat second of 5, between the cheaper 27US500 and the pricier CUNPU 4K, at the time of writing. The maker doesn't give its refresh rate; if that figure matters, the CUNPU 4K offers 160Hz.
Key dimensions & specs
- Resolution: 3840x2160 (4K)
- Size: 27 inches
- HDR: HDR10
Pros
- 4K resolution for sharp text and detail
- Built-in KVM switch for two computers
- HDR10 support
Cons
- HDR10 support without a DisplayHDR certification
- No published refresh rate
- Costs more than the 27US500 at the time of writing
Fastest Refresh3 of 5
CUNPU 27-inch 4K 160Hz on Amazon (opens in a new tab)
CUNPU's 27-inch 4K screen runs at 160Hz with an HDMI 2.1 input and 99% DCI-P3 coverage.
Best for
- Competitive shooters where motion clarity matters most.
Skip if
- Skip it if price comes first: the 27US500 cost less when we checked.
Why we like it
It is one of the cheapest 4K high-refresh monitors here. On refresh rate it leads this guide at 160Hz, ahead of the Samsung M70H (120Hz). It matches the 27US500, the ViewFinity S70H and the S2725QC on screen size (27 inches).
A fast IPS panel is unique to it among these picks, while the S2725QC uses an IPS panel. An HDR400 is unique to it among these picks, while the ViewFinity S70H uses an HDR10. A 99% DCI-P3 color gamut is unique to it among these picks, while the S2725QC uses a 99% sRGB color gamut.
It also offers 48Gbps HDMI 2.1 for consoles, a factory calibration of Delta E under 2 and 4K at a budget price tier. When we checked, only the ViewFinity S70H and cheaper picks cost less, and the Samsung M70H cost more.
Key dimensions & specs
- Refresh rate: 160Hz
- Resolution: 3840x2160 (4K)
- Size: 27 inches
- Panel: Fast IPS
- Response: 1ms
- HDR: HDR400
- Color gamut: 99% DCI-P3
- Adaptive sync: G-SYNC Compatible, FreeSync
Pros
- 160Hz for smoother motion than a 60Hz office screen
- 4K resolution for sharp text and detail
- a Fast IPS panel with wide viewing angles
- 99% DCI-P3 colour coverage
Cons
- Costs more than the 27US500 at the time of writing
Largest Screen Size4 of 5
Samsung 43-inch M70H Mini LED Smart TV on Amazon (opens in a new tab)
Samsung's M70H is a 43-inch 4K Mini LED TV with a 120Hz mode through Motion Xcelerator.
Best for
- Buyers who put screen size first.
Skip if
- Price-first buyers should look at the 27US500, which cost less when we checked.
Why we like it
Its gaming hub covers consoles and cloud services. On refresh rate it ties with the S2725QC at 120Hz. Its 43 inches screen size is the largest here; the 27US500 comes next at 27 inches.
You get a mini LED HDR here, which sets it apart from the CUNPU 4K and its an HDR400. It also offers Samsung TV Plus channels. At 4K, check that your graphics card and cable support 4K at the refresh rate you want before you buy.
Worth noting too: 4K resolution for sharp text and detail. It was priced above the CUNPU 4K and below the S2725QC at the time of writing.
Key dimensions & specs
- Refresh rate: 120Hz
- Resolution: 3840x2160 (4K)
- Size: 43 inches
- HDR: Mini LED HDR
Pros
- 4K resolution for sharp text and detail
- Motion Xcelerator with DLG 120Hz
- Gaming hub for consoles and cloud services
- Samsung TV Plus channels
Cons
- Costs more than the 27US500 at the time of writing
Premium Pick5 of 5
Dell 27 S2725QC 4K USB-C on Amazon (opens in a new tab)
What the S2725QC brings to the table is USB-C with up to 65W power delivery, plus 4K at 120Hz.
Best for
- Buyers who want the most complete package.
Skip if
- Skip it if refresh rate matters most to you; the CUNPU 4K offers 160Hz.
Why we like it
It also offers a 120Hz refresh rate and offers a 27 inches screen size. On refresh rate it ties with the Samsung M70H at 120Hz. It matches the 27US500, the ViewFinity S70H and the CUNPU 4K on screen size (27 inches).
It shares an IPS panel with the 27US500; the CUNPU 4K goes with a fast IPS panel. A 99% sRGB color gamut is unique to it among these picks, while the CUNPU 4K uses a 99% DCI-P3 color gamut. You also get 1500:1 contrast.
At 4K, check that your graphics card and cable support 4K at the refresh rate you want before you buy. At our last price check it topped the group, with the Samsung M70H the nearest cheaper option. Refresh rate is its weakest area, and the CUNPU 4K covers it better at 160Hz.
Key dimensions & specs
- Refresh rate: 120Hz
- Resolution: 3840x2160 (4K)
- Size: 27 inches
- Panel: IPS
- Response: 4ms
- Color gamut: 99% sRGB
- Adaptive sync: FreeSync Premium
- USB-C: Yes
Pros
- 4K resolution for sharp text and detail
- an IPS panel with wide viewing angles
- 99% sRGB colour coverage
- FreeSync Premium to reduce screen tearing
Cons
- Refresh rate trails the CUNPU 4K (160Hz)
- Screen size trails the Samsung M70H (43 inches)
- Costs more than the 27US500 at the time of writing
How We Chose These Monitors for Machine Learning
Each pick was assessed across 4 criteria weighted for real-world use.
- Connectivity and stand
- We checked ports, USB-C and stand adjustment where the listing states them.
- Resolution and refresh
- We compared listed resolution and refresh rate against the graphics power each needs.
- HDR and colour
- We recorded DisplayHDR certifications and listed colour gamut.
- Panel
- We noted panel type and the trade-offs it brings for motion, contrast and burn-in.
What to Look for in a Monitor for Machine Learning
Key buying criteria so you get the right fit the first time.
Where these picks differ: screen size
Among these picks, screen size runs from 27 inches on the S2725QC to 43 inches on the Samsung M70H. Match this to what you will actually do with it, then let price decide between the picks that qualify.
Match resolution to your graphics card
1080p suits entry and mid-range cards and high refresh rates. 1440p is the balance for most gaming PCs. 4K needs a high-end card to hold high frame rates.
Pick the resolution your card can drive before looking at refresh rate.
Pick the panel type
IPS offers wide viewing angles and good colour. VA has higher contrast but slower dark transitions. OLED has perfect blacks and very fast response but carries a burn-in risk with static content.
Read HDR labels carefully
HDR10 means the monitor accepts an HDR signal, not that it displays it well. DisplayHDR 600 or True Black 400 certifications say more about real HDR performance.
Choose a refresh rate you can reach
A higher refresh rate only helps when your PC delivers matching frame rates. 144Hz to 180Hz suits most players; 240Hz and above rewards competitive shooters.
How to Choose a Monitor for Machine Learning
By priority
| Priority | Consider | Why |
|---|---|---|
| Keeping the budget tight | 27US500 | Undercutting the ViewFinity S70H on price when we checked |
| Buyers who want built-in KVM switch for two computers | ViewFinity S70H | A built-in KVM switch for two computers |
| Competitive shooters where motion clarity matters most | CUNPU 4K | The highest refresh rate here (160Hz) |
| Buyers who put screen size first | Samsung M70H | The largest screen size here (43 inches) |
| Buyers who want the most complete package | S2725QC | The highest-priced pick here at the time of writing, with USB-C with up to 65W power delivery |
Scroll sideways to see every column.
Key specs side by side
Figures as each maker states them.
| Monitor | Refresh rate | Resolution | Size | Panel |
|---|---|---|---|---|
| 27US500 | Not listed | 3840x2160 (4K) | 27 inches | IPS |
| ViewFinity S70H | Not listed | 3840x2160 (4K) | 27 inches | Not listed |
| CUNPU 4K | 160Hz | 3840x2160 (4K) | 27 inches | Fast IPS |
| Samsung M70H | 120Hz | 3840x2160 (4K) | 43 inches | Not listed |
| S2725QC | 120Hz | 3840x2160 (4K) | 27 inches | IPS |
Scroll sideways to see every column.
By price at the time of writing
Prices change often; these tiers reflect Amazon prices when this guide was updated.
| Price tier | Monitors |
|---|---|
| About $150 to $250 | 27US500, ViewFinity S70H, CUNPU 4K |
| About $250 to $500 | Samsung M70H, S2725QC |
Frequently Asked Questions
Which pick leads on refresh rate?
The CUNPU 4K leads at 160Hz, ahead of the Samsung M70H at 120Hz; the S2725QC sits at the other end with 120Hz.
Which pick costs the least here?
The 27US500 cost the least when we checked, and the S2725QC sat at the top of the range. Prices move often, so check the current listing before buying.
Is HDR worth it on a budget monitor?
Rarely. Budget HDR10 monitors accept HDR but lack the brightness and contrast to show it well. OLED or DisplayHDR 600 models do it better.
Does a 1ms response time rating matter?
Makers measure response time differently, so compare panel type and independent reviews rather than the headline figure.
Is 1080p fine on a 27-inch monitor?
It works, but text and detail look softer. 1440p is sharper at 27 inches; 1080p is best at 24 to 25 inches.
Bottom Line
Our first pick is the 27US500, chosen for undercutting the ViewFinity S70H on price when we checked. Look at the ViewFinity S70H for a built-in KVM switch for two computers, the Samsung M70H for the largest screen size here (43 inches) and the S2725QC for the highest-priced pick here at the time of writing, with USB-C with up to 65W power delivery if those matter more to you.
Use 125% or 150% scaling on a 4K screen.