Roku Ultra (4660) vs Roku Ultra (4800)

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Ultra (4660) compared with Ultra (4800)

	RokuUltra (4660)	RokuUltra (4800)
Overview
Released
Released	October 2017	October 2020
Video and audio
Resolution
Resolution	4K	4K
HDR
HDR	HDR10	HDR10, Dolby Vision and HLG (better)
Dolby Atmos
Dolby Atmos	–	Yes
Video
Video	HD, 4K and 4K HDR at up to 60 fps; protected 4K requires HDCP 2.2 (Roku launch release and original 4660 comparison chart)	Up to 4K at 60 fps; Roku's model-4800 guide specifies an HDCP 2.2 HDMI connection for 4K
HDR
HDR	HDR10 (Roku's exact Bryan/4660X developer row); no Dolby Vision in the original 4660 comparison chart	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 Audio and DTS passthrough over HDMI; night listening mode (Roku's original 4660 comparison chart). Optical output removed from the previous 4640 model	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-A53; OpenGL ES 2.0 (Roku's exact Bryan/4660X developer row); quad-core confirmed by the original 4660 comparison chart. Clock speed unpublished	Quad-core processor (Roku launch announcement); Roku's Benjamin/4800X developer row identifies Arm Cortex-A55
Memory
Memory	1 GB (Roku's exact Bryan/4660X developer row)	2 GB (Roku's Benjamin/4800X developer row)
Storage
Storage	microSD adds channel storage and can improve channel loading; not local media playback. Use the USB media port for supported local files	–
Software and services
Software and services	Roku OS; apps and features vary by region and software version	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	Yes	Yes
Voice remote
Voice remote	Yes	Yes
Ports
Ports	HDMI, Ethernet, microSD, USB media port and power input; no optical audio output	HDMI, USB, Ethernet and power input (model-4800 Quick Start Guide); no microSD slot (both reviews)
Wi-Fi and Bluetooth
Wi-Fi and Bluetooth	802.11ac dual-band MIMO (Roku's original 4660 comparison chart)	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 voice remote with television power and volume buttons, headphone socket, gaming buttons and lost-remote finder. Television controls require a compatible television; no later personal shortcut buttons	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	–	Supplied mains power adaptor
Size
Size	Approximately 5-inch-square box (Tom's Guide)	4.9 × 4.9 × 0.9 in (Tom's Guide)
In the box
In the box	–	Ultra player, voice remote, headphones, two AA batteries, Premium High Speed HDMI cable and power adaptor