Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Samsung - S90F QD-OLED 65 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Peak brightness | 2100 nits | 5000 nits |
| Screen size | 65 " | 75 " |
| HDMI 2.1 ports | 4 | 2 |
| Dolby Vision | false | true |
| Panel type | QD-OLED | Mini-LED |
| Smart OS | Tizen | Google TV |
Between the S90F QD-OLED 65 and QM851 Mini LED 75, the S90F QD-OLED 65 comes out ahead in hdmi 2.1 ports / panel type, while the QM851 Mini LED 75 wins on peak brightness / screen size. Overall, the S90F QD-OLED 65 scores 74.7 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 (74.7 vs 78.2), but the 3.5-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the S90F QD-OLED 65 if you care most about hdmi 2.1 ports / panel type. The biggest gaps in its favor are hdmi 2.1 ports, panel type. 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, screen size, dolby vision, among others. The single most decisive one: Peak brightness — 138.10% more. 5000 nits vs 2100 nits.
Both ship with comparable 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: Samsung - S90F QD-OLED 65 or TCL - QM851 Mini LED 75?
TCL - QM851 Mini LED 75 leads the current Mars Score by 3.5 points.The more useful decision is the trade-off behind that result: compare screen size, panel type, hdmi 2.1 ports against the way you will actually use the product.
Choose Samsung - S90F QD-OLED 65 if…
Samsung - S90F QD-OLED 65 has the measurable edge on hdmi 2 1 count, panel type.
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 - S90F QD-OLED 65 wins
- ▲HDMI 2.1 ports — 2.00 more. 4 vs 2.
- ▲Panel type: QD-OLED (vs Mini-LED).
Why TCL - QM851 Mini LED 75 wins
- ▲Peak brightness — 138.10% more. 5000 nits vs 2100 nits.
- ▲Screen size — 15.38% more. 75 " vs 65 ".
- ▲Has Dolby Vision.
- ▲Smart OS: Google TV (vs Tizen).
Spec comparison
Display
| Spec | Samsung - S90F QD-OLED 65 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Screen size | 65 " | 75 "lead |
| Panel typeⓘ | QD-OLEDlead | Mini-LED |
| Resolutionⓘ | 4K | 4K |
| Refresh rateⓘ | 144 Hz | 144 Hz |
| Peak brightnessⓘ | 2100 nits | 5000 nitslead |
HDR & Smart
| Spec | Samsung - S90F QD-OLED 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 - S90F QD-OLED 65 | TCL - QM851 Mini LED 75 |
|---|---|---|
| HDMI 2.1 portsⓘ | 4lead | 2 |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, S90F QD-OLED 65 or QM851 Mini LED 75?+
QM851 Mini LED 75 peaks at 5000 nits vs 2100 nits.
Which is better for gaming, S90F QD-OLED 65 or QM851 Mini LED 75?+
S90F QD-OLED 65 offers 144Hz refresh and 4 HDMI 2.1 ports.
Does S90F QD-OLED 65 or QM851 Mini LED 75 support Dolby Vision?+
QM851 Mini LED 75 supports Dolby Vision; S90F QD-OLED 65 does not.