Roku 3 (4200) vs Roku Express 4K (3940)

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3 (4200) compared with Express 4K (3940)

	Roku3 (4200)	RokuExpress 4K (3940)
Overview
Released
Released	March 2013	May 2021
Video and audio
Resolution
Resolution	1080p	4K (better)
HDR
HDR	None	HDR10, HDR10+ and HLG (better)
Video
Video	Up to 1080p HD (original Roku announcement); HDMI only, with no analogue A/V output	Up to 4K at 60 fps (Roku's exact Marlin/3940X developer row); HDCP 2.2 required for 4K/HDR
HDR
HDR	–	HDR10, HDR10+ and HLG (Roku's exact Marlin/3940X developer row); no Dolby Vision
Performance
Software
Software	Roku OS	Roku OS
Chip details
Chip details	Arm Cortex-A9 dual-core at 1 GHz; OpenGL ES 2.0 (Roku's exact Austin/4200X developer row)	Arm Cortex-A55; OpenGL ES 2.0 (Roku's exact Marlin/3940X developer row)
Memory
Memory	512 MB (Roku's exact Austin/4200X developer row)	1 GB (Roku's exact Marlin/3940X developer row)
Storage
Storage	microSD expands channel/app storage; local media uses the USB port	Internal storage serves system/channel use; maker sources used do not publish user-accessible capacity
Software and services
Software and services	Roku OS; apps and services vary by region and software version. Maker developer row lists release year 2014, conflicting with the original March 6, 2013 release announcement used here	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
Connections
Wi-Fi
Wi-Fi	Wi-Fi 4	Wi-Fi 5
Ethernet
Ethernet	Yes	No
Voice remote
Voice remote	No	No
Ports
Ports	HDMI, Ethernet, USB media playback, microSD channel-storage slot and power	HDMI output, micro-USB power/compatible Ethernet adaptor connection and reset. No built-in Ethernet socket; USB Ethernet adaptor sold separately
Wi-Fi and Bluetooth
Wi-Fi and Bluetooth	Dual-band Wi-Fi (Roku launch release); 2.4/5 GHz confirmed by SmallNetBuilder. Original remote uses Wi-Fi Direct rather than Bluetooth	Dual-band 802.11ac Wi-Fi (Tech Advisor)
Remote
Remote	Original enhanced motion remote with headphone socket and A/B game controls. Side volume buttons control headphones only; no microphone or television power controls. Distinct from the 2015 voice-remote bundle	Original standard infrared remote with channel shortcuts; no microphone, television power/volume controls or headphone socket. Express 4K+ 3941 includes the voice remote instead
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
In the box
In the box	Player, enhanced remote and in-ear headphones; HDMI cable not supplied (SmallNetBuilder)	Player, infrared remote, batteries, premium high-speed HDMI cable, USB power cable, power adaptor and removable adhesive strip