Roku Plus Series 55" vs Samsung QN900D 65" (8K)
The Verdict
These TVs occupy completely different market positions. The Roku Plus Series 55" delivers solid 4K QLED performance at an exceptional $399 price point, making it one of the most affordable 55-inch options available. It handles standard content well with 700 nits brightness, Dolby Vision support, and a respectable 13ms input lag for casual gaming. The 20-watt 2.0ch audio is basic but serviceable. Conversely, the Samsung QN900D 65" represents flagship 8K technology costing $4999, featuring a 120Hz native refresh rate, exceptional 4000 nits peak brightness via Mini-LED backlighting with 64 zones, and an advanced 6.2.4ch object-tracking speaker system delivering 90 watts. Its 5ms input lag and variable refresh rate support cater to serious gamers. The Samsung's Neural Quantum Processor 8K upscaling is genuinely impressive for the limited 8K content available. Buying between these requires honest assessment: the Roku suits budget-conscious viewers prioritizing 4K content and value, while the Samsung targets enthusiasts willing to pay a premium for cutting-edge display technology and peak performance. For most viewers, the Roku provides excellent functionality at a fraction of the cost. The Samsung justifies its price only if you genuinely want 8K capability and the best possible picture quality money can buy.
Who Should Buy
Buy the Roku Plus Series 55" if…
- →Roku OS is the simplest, cleanest smart TV platform available
- →Dolby Vision, HDR10+, AND Dolby Atmos decoding — unusual at $399
- →Works with every voice assistant: Alexa, Google, Siri (via AirPlay)
Buy the Samsung QN900D 65" (8K) if…
- →True 8K resolution with AI-powered upscaling for lower-resolution content
- →Mini-LED backlighting with thousands of dimming zones for stunning contrast
- →90W 6.2.4ch audio system with Dolby Atmos is best-in-class built-in sound
Category Scores
Pros & Cons
Roku Plus Series 55"
Pros
- Roku OS is the simplest, cleanest smart TV platform available
- Dolby Vision, HDR10+, AND Dolby Atmos decoding — unusual at $399
- Works with every voice assistant: Alexa, Google, Siri (via AirPlay)
- Wi-Fi 6 for reliable 4K streaming
- QLED color enhancement is visible versus basic LED panels
Cons
- 60Hz panel — no 120Hz or gaming features
- 700-nit brightness is okay but not impressive for HDR highlights
- Roku's ad-supported free channels are prominently pushed in the UI
- No VRR for next-gen console gaming
Samsung QN900D 65" (8K)
Pros
- True 8K resolution with AI-powered upscaling for lower-resolution content
- Mini-LED backlighting with thousands of dimming zones for stunning contrast
- 90W 6.2.4ch audio system with Dolby Atmos is best-in-class built-in sound
- 8K@120Hz via HDMI 2.1 future-proofs for next-gen content
- Infinity Screen design with near-zero bezels
Cons
- Extremely expensive at $4,999 for very limited 8K content
- Tizen OS still shows ads on the home screen
- Massive and heavy — requires sturdy mounting
- No Dolby Vision support — Samsung uses HDR10+ exclusively
Full Specifications
| Spec | Roku Plus Series 55" | Samsung QN900D 65" (8K) |
|---|---|---|
| Body | ||
| VESA mount | 200 x 200mm | 400 x 400mm |
| Weight | 26.5 lbs | 61.7 lbs |
| Dimensions (w/ stand) | 48.4 x 30.6 x 10.2 inches | 57.1 x 36.8 x 12.7 inches |
| Audio | ||
| Output (watts) | 20 | 90 |
| Speakers | 2.0ch | 6.2.4ch Object Tracking Sound Pro |
| Dolby Atmos | ||
| Gaming | ||
| VRR (Variable Refresh Rate) | ||
| ALLM | ||
| Input lag (ms) | 13 | 5 |
| Display | ||
| HDR | Dolby Vision, HDR10+, HLG | Quantum HDR 64x, HDR10+, HLG |
| Size | 55" | 65" |
| Type | QLED | Neo QLED Mini-LED |
| Resolution | 3840 x 2160 (4K UHD) | 7680 x 4320 (8K) |
| Refresh rate | 60Hz | 120Hz (8K@120Hz) |
| Brightness (nits) | 700 | 4000 |
| Smart TV | ||
| Os | Roku OS | Tizen OS |
| Voice assistant | Roku Voice, Alexa, Google Assistant, Apple AirPlay 2 | Bixby, Alexa, Google Assistant |
| Processor | ||
| Chipset | Quad-core | Neural Quantum Processor 8K |
| Connectivity | ||
| Wi-Fi | Wi-Fi 6 (802.11ax) | Wi-Fi 6E |
| Ethernet | ||
| Bluetooth | 5.2 | 5.3 |
| USB ports | 1 | 3 |
| HDMI ports | 4 | 4 |
Want to compare a third product?
Add another product for a 3-way comparison.
Related Comparisons
This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
Explore more in tvs, see all Roku products or all Samsung products. View full details for the Roku Plus Series 55" or the Samsung QN900D 65" (8K).