The main difference between the H7 Flow and the H7 Flow RGB from NZXT lies mainly in the following aspects:

## Fans and lighting
- The H7 Flow RGB comes with three pre-installed 140mm F140 RGB core fans and one 120mm F120Q Quiet Airflow fan, all of which have RGB lighting. In contrast, the H7 Flow has two 120 mm F120Q Quiet Airflow fans without RGB lighting as standard.

## Lighting control
- The H7 Flow RGB allows the RGB fans to be connected to the 5V ARGB header on the motherboard, which enables centralised control of the RGB lighting. The H7 Flow without RGB has no such function.

## Optical differences
- Both models have perforated panels on the front and top, but the H7 Flow RGB offers the additional aesthetic addition of RGB lighting, making it visually different from the standard version.

## Price
- The H7 Flow RGB is generally more expensive than the H7 Flow without RGB, due to the additional RGB features and the corresponding fans.

Overall, the H7 Flow RGB offers additional RGB lighting and control, which makes it particularly attractive for users who value colourful aesthetics.