Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | TCL - QM851 Mini LED 65 | Samsung - S90F QD-OLED 65 |
|---|---|---|
| Peak brightness | 5000 nits | 2100 nits |
| HDMI 2.1 ports | 2 | 4 |
| Dolby Vision | true | false |
| Smart OS | Google TV | Tizen |
| Panel type | Mini-LED | QD-OLED |
Between the QM851 Mini LED 65 and S90F QD-OLED 65, the QM851 Mini LED 65 comes out ahead in peak brightness / dolby vision, while the S90F QD-OLED 65 wins on hdmi 2.1 ports / panel type. Overall, the QM851 Mini LED 65 scores 76.2 and the S90F QD-OLED 65 scores 74.7 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (76.2 vs 74.7). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the QM851 Mini LED 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 peak brightness, dolby vision, smart os. The single most decisive one: Peak brightness — 138.10% more. 5000 nits vs 2100 nits.
Pick the S90F QD-OLED 65 if you care most about hdmi 2.1 ports / panel type. Its strongest claims are hdmi 2.1 ports, panel type. The single most decisive one: HDMI 2.1 ports — 2.00 more. 4 vs 2.
Both ship with comparable screen size, refresh rate, 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: TCL - QM851 Mini LED 65 or Samsung - S90F QD-OLED 65?
TCL - QM851 Mini LED 65 leads the current Mars Score by 1.5 points.The more useful decision is the trade-off behind that result: compare panel type, hdmi 2.1 ports against the way you will actually use the product.
Choose TCL - QM851 Mini LED 65 if…
TCL - QM851 Mini LED 65 has the measurable edge on peak brightness nits, has dolby vision, smart os.
Choose Samsung - S90F QD-OLED 65 if…
Samsung - S90F QD-OLED 65 has the measurable edge on hdmi 2 1 count, panel type.
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 - QM851 Mini LED 65 wins
- ▲Peak brightness — 138.10% more. 5000 nits vs 2100 nits.
- ▲Has Dolby Vision.
- ▲Smart OS: Google TV (vs Tizen).
Why Samsung - S90F QD-OLED 65 wins
- ▲HDMI 2.1 ports — 2.00 more. 4 vs 2.
- ▲Panel type: QD-OLED (vs Mini-LED).
Spec comparison
Display
| Spec | TCL - QM851 Mini LED 65 | Samsung - S90F QD-OLED 65 |
|---|---|---|
| Screen size | 65 " | 65 " |
| Panel typeⓘ | Mini-LED | QD-OLEDlead |
| Resolutionⓘ | 4K | 4K |
| Refresh rateⓘ | 144 Hz | 144 Hz |
| Peak brightnessⓘ | 5000 nitslead | 2100 nits |
HDR & Smart
| Spec | TCL - QM851 Mini LED 65 | Samsung - S90F QD-OLED 65 |
|---|---|---|
| Dolby Visionⓘ | truelead | false |
| HDR10+ⓘ | true | true |
| Smart OS | Google TVlead | Tizen |
| Dolby Atmosⓘ | true | true |
Gaming
| Spec | TCL - QM851 Mini LED 65 | Samsung - S90F QD-OLED 65 |
|---|---|---|
| HDMI 2.1 portsⓘ | 2 | 4lead |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, QM851 Mini LED 65 or S90F QD-OLED 65?+
QM851 Mini LED 65 peaks at 5000 nits vs 2100 nits.
Which is better for gaming, QM851 Mini LED 65 or S90F QD-OLED 65?+
S90F QD-OLED 65 offers 144Hz refresh and 4 HDMI 2.1 ports.
Does QM851 Mini LED 65 or S90F QD-OLED 65 support Dolby Vision?+
QM851 Mini LED 65 supports Dolby Vision; S90F QD-OLED 65 does not.