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 65 |
|---|---|---|
| Peak brightness | 3500 nits | 5000 nits |
| Screen size | 75 " | 65 " |
| HDMI 2.1 ports | 4 | 2 |
Between the QM7K Mini-LED 75 and QM851 Mini LED 65, the QM7K Mini-LED 75 comes out ahead in screen size / hdmi 2.1 ports, while the QM851 Mini LED 65 wins on peak brightness. Overall, the QM7K Mini-LED 75 scores 76.4 and the QM851 Mini LED 65 scores 76.2 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (76.4 vs 76.2). 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 the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. The biggest gaps in its favor are screen size, hdmi 2.1 ports. The single most decisive one: Screen size — 15.38% more. 75 " vs 65 ".
Pick the QM851 Mini LED 65 if you care most about peak brightness. 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 panel type, refresh rate, dolby vision, 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 65?
TCL - QM7K Mini-LED 75 leads the current Mars Score by 0.2 points.The more useful decision is the trade-off behind that result: compare screen size, 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 screen size in, hdmi 2 1 count.
Choose TCL - QM851 Mini LED 65 if…
TCL - QM851 Mini LED 65 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
- ▲Screen size — 15.38% more. 75 " vs 65 ".
- ▲HDMI 2.1 ports — 2.00 more. 4 vs 2.
Why TCL - QM851 Mini LED 65 wins
- ▲Peak brightness — 42.86% more. 5000 nits vs 3500 nits.
Spec comparison
Display
| Spec | TCL - QM7K Mini-LED 75 | TCL - QM851 Mini LED 65 |
|---|---|---|
| Screen size | 75 "lead | 65 " |
| 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 65 |
|---|---|---|
| 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 65 |
|---|---|---|
| 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 65?+
QM851 Mini LED 65 peaks at 5000 nits vs 3500 nits.
Which is better for gaming, QM7K Mini-LED 75 or QM851 Mini LED 65?+
QM7K Mini-LED 75 offers 144Hz refresh and 4 HDMI 2.1 ports.
Does QM7K Mini-LED 75 or QM851 Mini LED 65 support Dolby Vision?+
Both support Dolby Vision.