Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Samsung - QN900F 8K 65 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Peak brightness | 3000 nits | 5000 nits |
| Screen size | 65 " | 75 " |
| Refresh rate | 165 Hz | 144 Hz |
| HDMI 2.1 ports | 4 | 2 |
| Dolby Vision | false | true |
| Smart OS | Tizen | Google TV |
Between the QN900F 8K 65 and QM851 Mini LED 75, the QN900F 8K 65 comes out ahead in refresh rate / hdmi 2.1 ports, while the QM851 Mini LED 75 wins on peak brightness / screen size. Overall, the QN900F 8K 65 scores 74.1 and the QM851 Mini LED 75 scores 78.2 on our Mars Score.
Which should you buy?
The QM851 Mini LED 75 edges ahead on the Mars Score (74.1 vs 78.2), but the 4.1-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the QN900F 8K 65 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 refresh rate, hdmi 2.1 ports. The single most decisive one: Refresh rate — 14.58% more. 165 Hz vs 144 Hz.
Pick the QM851 Mini LED 75 if you care most about peak brightness / screen size. Its strongest claims are peak brightness, screen size, dolby vision, among others. The single most decisive one: Peak brightness — 66.67% more. 5000 nits vs 3000 nits.
Both ship with comparable panel type, vrr, 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: Samsung - QN900F 8K 65 or TCL - QM851 Mini LED 75?
TCL - QM851 Mini LED 75 leads the current Mars Score by 4.1 points.The more useful decision is the trade-off behind that result: compare screen size, refresh rate, hdmi 2.1 ports against the way you will actually use the product.
Choose Samsung - QN900F 8K 65 if…
Samsung - QN900F 8K 65 has the measurable edge on refresh rate hz, hdmi 2 1 count.
Choose TCL - QM851 Mini LED 75 if…
TCL - QM851 Mini LED 75 has the measurable edge on peak brightness nits, screen size in, has dolby vision.
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 Samsung - QN900F 8K 65 wins
- ▲Refresh rate — 14.58% more. 165 Hz vs 144 Hz.
- ▲HDMI 2.1 ports — 2.00 more. 4 vs 2.
Why TCL - QM851 Mini LED 75 wins
- ▲Peak brightness — 66.67% more. 5000 nits vs 3000 nits.
- ▲Screen size — 15.38% more. 75 " vs 65 ".
- ▲Has Dolby Vision.
- ▲Smart OS: Google TV (vs Tizen).
Spec comparison
Display
| Spec | Samsung - QN900F 8K 65 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Screen size | 65 " | 75 "lead |
| Panel typeⓘ | Mini-LED | Mini-LED |
| Resolutionⓘ | 8Klead | 4K |
| Refresh rateⓘ | 165 Hzlead | 144 Hz |
| Peak brightnessⓘ | 3000 nits | 5000 nitslead |
HDR & Smart
| Spec | Samsung - QN900F 8K 65 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Dolby Visionⓘ | false | truelead |
| HDR10+ⓘ | true | true |
| Smart OS | Tizen | Google TVlead |
| Dolby Atmosⓘ | true | true |
Gaming
| Spec | Samsung - QN900F 8K 65 | TCL - QM851 Mini LED 75 |
|---|---|---|
| HDMI 2.1 portsⓘ | 4lead | 2 |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, QN900F 8K 65 or QM851 Mini LED 75?+
QM851 Mini LED 75 peaks at 5000 nits vs 3000 nits.
Which is better for gaming, QN900F 8K 65 or QM851 Mini LED 75?+
QN900F 8K 65 offers 165Hz refresh and 4 HDMI 2.1 ports.
Does QN900F 8K 65 or QM851 Mini LED 75 support Dolby Vision?+
QM851 Mini LED 75 supports Dolby Vision; QN900F 8K 65 does not.