Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | TCL - QM7K Mini-LED 75 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Peak brightness | 3500 nits | 5000 nits |
| HDMI 2.1 ports | 4 | 2 |
Between the QM7K Mini-LED 75 and QM851 Mini LED 75, the QM7K Mini-LED 75 comes out ahead in hdmi 2.1 ports, while the QM851 Mini LED 75 wins on peak brightness. Overall, the QM7K Mini-LED 75 scores 76.4 and the QM851 Mini LED 75 scores 78.2 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (76.4 vs 78.2). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the QM7K Mini-LED 75 if you care most about hdmi 2.1 ports. The biggest gaps in its favor are hdmi 2.1 ports. The single most decisive one: HDMI 2.1 ports — 2.00 more. 4 vs 2.
Pick the QM851 Mini LED 75 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are peak brightness. The single most decisive one: Peak brightness — 42.86% more. 5000 nits vs 3500 nits.
Both ship with comparable screen size, panel type, refresh rate, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: TCL - QM7K Mini-LED 75 or TCL - QM851 Mini LED 75?
TCL - QM851 Mini LED 75 leads the current Mars Score by 1.8 points.The more useful decision is the trade-off behind that result: compare hdmi 2.1 ports against the way you will actually use the product.
Choose TCL - QM7K Mini-LED 75 if…
TCL - QM7K Mini-LED 75 has the measurable edge on hdmi 2 1 count.
Choose TCL - QM851 Mini LED 75 if…
TCL - QM851 Mini LED 75 has the measurable edge on peak brightness nits.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why TCL - QM7K Mini-LED 75 wins
- ▲HDMI 2.1 ports — 2.00 more. 4 vs 2.
Why TCL - QM851 Mini LED 75 wins
- ▲Peak brightness — 42.86% more. 5000 nits vs 3500 nits.
Spec comparison
Display
| Spec | TCL - QM7K Mini-LED 75 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Screen size | 75 " | 75 " |
| Panel typeⓘ | Mini-LED | Mini-LED |
| Resolutionⓘ | 4K | 4K |
| Refresh rateⓘ | 144 Hz | 144 Hz |
| Peak brightnessⓘ | 3500 nits | 5000 nitslead |
HDR & Smart
| Spec | TCL - QM7K Mini-LED 75 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Dolby Visionⓘ | true | true |
| HDR10+ⓘ | true | true |
| Smart OS | Google TV | Google TV |
| Dolby Atmosⓘ | true | true |
Gaming
| Spec | TCL - QM7K Mini-LED 75 | TCL - QM851 Mini LED 75 |
|---|---|---|
| HDMI 2.1 portsⓘ | 4lead | 2 |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, QM7K Mini-LED 75 or QM851 Mini LED 75?+
QM851 Mini LED 75 peaks at 5000 nits vs 3500 nits.
Which is better for gaming, QM7K Mini-LED 75 or QM851 Mini LED 75?+
QM7K Mini-LED 75 offers 144Hz refresh and 4 HDMI 2.1 ports.
Does QM7K Mini-LED 75 or QM851 Mini LED 75 support Dolby Vision?+
Both support Dolby Vision.