Roku Express 4K (3940) vs Roku Ultra (4800)

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Express 4K (3940) compared with Ultra (4800)

	RokuExpress 4K (3940)	RokuUltra (4800)
Overview
Released
Released	May 2021	October 2020
Video and audio
Resolution
Resolution	4K	4K
HDR
HDR	HDR10, HDR10+ and HLG	HDR10, Dolby Vision and HLG
Dolby Atmos
Dolby Atmos	–	Yes
Video
Video	Up to 4K at 60 fps (Roku's exact Marlin/3940X developer row); HDCP 2.2 required for 4K/HDR	Up to 4K at 60 fps; Roku's model-4800 guide specifies an HDCP 2.2 HDMI connection for 4K
HDR
HDR	HDR10, HDR10+ and HLG (Roku's exact Marlin/3940X developer row); no Dolby Vision	Roku's current Benjamin/4800X developer row lists HDR10, Dolby Vision and HLG. An older model-4800 support document also claims HDR10+, which the developer row omits; HDR10+ is left out of the main field pending reconciliation
Audio
Audio	–	Dolby Atmos with compatible content and sound system; TechRadar lists AAC, MP3, WMA, FLAC, PCM, AC3/EAC3, DTS and ALAC support
Performance
Software
Software	Roku OS	Roku OS
Chip details
Chip details	Arm Cortex-A55; OpenGL ES 2.0 (Roku's exact Marlin/3940X developer row)	Quad-core processor (Roku launch announcement); Roku's Benjamin/4800X developer row identifies Arm Cortex-A55
Memory
Memory	1 GB (Roku's exact Marlin/3940X developer row)	2 GB (Roku's Benjamin/4800X developer row)
Storage
Storage	Internal storage serves system/channel use; maker sources used do not publish user-accessible capacity	–
Software and services
Software and services	Launched with Roku OS 10. App availability varies by region and software version. May 2021 on-sale month is from the exact UK Tech Advisor review; the maker developer table gives only 2021. Cord Busters identifies this model as the UK replacement for Premiere 3920	Roku OS; OS 9.4 was announced alongside the player. AirPlay 2 and HomeKit were added after launch, as confirmed in Tom's Guide's review; apps and features vary by country and software version
Connections
Wi-Fi
Wi-Fi	Wi-Fi 5	Wi-Fi 5
Ethernet
Ethernet	No	Yes
Voice remote
Voice remote	No	Yes
Ports
Ports	HDMI output, micro-USB power/compatible Ethernet adaptor connection and reset. No built-in Ethernet socket; USB Ethernet adaptor sold separately	HDMI, USB, Ethernet and power input (model-4800 Quick Start Guide); no microSD slot (both reviews)
Wi-Fi and Bluetooth
Wi-Fi and Bluetooth	Dual-band 802.11ac Wi-Fi (Tech Advisor)	Dual-band 802.11ac (TechRadar); Bluetooth support and up to 50% greater wireless range than the prior model (Roku's launch claim)
Smart home
Smart home	–	Controllable through compatible Amazon Alexa and Google Assistant devices; AirPlay 2 and HomeKit support with updated software
Remote
Remote	Original standard infrared remote with channel shortcuts; no microphone, television power/volume controls or headphone socket. Express 4K+ 3941 includes the voice remote instead	Original voice remote has TV power, volume and mute, headphone jack, two personal shortcuts and lost-remote finder; two AA batteries. Later rechargeable-remote bundles are not separate player hardware here
Design
Type
Type	Box	Box
Power
Power	USB power cable and mains adaptor supplied; use the adaptor if the television USB port provides insufficient power	Supplied mains power adaptor
Size
Size	–	4.9 × 4.9 × 0.9 in (Tom's Guide)
In the box
In the box	Player, infrared remote, batteries, premium high-speed HDMI cable, USB power cable, power adaptor and removable adhesive strip	Ultra player, voice remote, headphones, two AA batteries, Premium High Speed HDMI cable and power adaptor