UniFi NVR G2 vs NVR G2 Pro: The $300 Buys Capacity, Not Speed

Most matchups on this site turn on a radio, a port class or a sensor. This one turns on nothing but size, which makes it one of the easier decisions here — and one of the easier ones to overspend on.

These are the two NVRs this site tracks, and both exist for the same reason: recording on the gateway stops scaling long before the camera count does. A UDM-Pro Max is rated for 15 4K cameras across two drive bays, and it is doing routing and IDS/IPS at the same time. The NVR G2 doubles that channel rating and does nothing but record; the Pro more than triples it.

Ubiquiti publishes no release date for either model on techspecs.ui.com, so this page makes no claim about when they shipped. The NVR hub lists both side by side.

This is the section that decides the purchase, because it is where the intuition is usually wrong. A model that costs 43% more and is rated for 67% more 4K cameras looks like a faster machine. On everything Ubiquiti publishes, it is the same machine with more room in it.

The shared 10G SFP+ matters more than the price gap suggests. Recording is a write-heavy, many-small-streams workload, and the uplink is what carries every camera's feed to the appliance. Both models put it on the same port, so a site that saturates the G2's networking will saturate the Pro's identically. If the uplink is the constraint, neither model solves it and the answer is elsewhere in the rack.

The shared 16 4K viewport streams is the other figure worth reading twice. That ceiling is about live decode to an attached display, not about recording, and it does not move with the price. A wall of monitors is not a reason to buy the Pro.

The G2's viewport penalty is the sharpest number on either page and the one most likely to be missed. Using the built-in HDMI output costs a third of the 4K capacity: 30 channels drops to 20. A twenty-four-camera 4K site that budgets on the headline figure and then plugs a monitor into the front of the appliance is over its rating.

Ubiquiti prints two figures for the G2 and one for the Pro. This page will not explain why, because the specification does not say — it is not published as "no penalty", it is simply not published. If the plan involves a viewport on a Pro near its ceiling, confirm the number with Ubiquiti before committing to a camera count, rather than reading the single figure as a guarantee.

Channel ratings are also a ceiling, not a recommendation. Resolution, frame rate, retention and smart-detection load all sit underneath them. Protect storage sizing works through the arithmetic that actually determines how long footage survives, and how to choose a UniFi camera covers what feeds these appliances.

Neither price includes a single drive, and that is the larger number in both cases. Eight bays is not merely twice the capacity of four — it is twice the disk invoice, at the moment of purchase, for storage that may not be needed for years. Four large drives in a G2 will usually beat eight small ones in a Pro on both cost and power.

The 2U is worth checking against the rack before ordering. In a half-height wall cabinet the difference between 1U and 2U is a meaningful fraction of what is there, and this appliance is 325 mm deep with cabling behind it.

Both models accept USP-RPS, so redundant power is available at either tier and is not a reason to move up. PoE budget planning covers the switch side of a camera build, which is where the power arithmetic for the cameras themselves lives.

Buy the NVR G2 unless one of these is true:

• The 4K camera count is above 30, or above 20 if a viewport will be in use. This is the rating that runs out first on real sites.
• Retention is long and the cameras are 4K. Four bays fill faster than four bays sound like they will; Protect storage sizing is the calculation to run before deciding.
• The rack has 2U free and the drives are already owned. Eight bays is cheap headroom when the disks are not a new purchase.

Buy the NVR G2 Pro for those cases and expect nothing else from it. It will not record faster, move footage faster, or drive more monitors than the G2 — it holds more.

If neither appliance is clearly justified, the question is whether a gateway still covers the site. The UDM-Pro Max records 15 4K cameras on two bays while routing, and how to choose a UniFi gateway sets out where that ceiling sits across the range. The Security Cameras hub lists what feeds either one.