VPU (Video Processing Unit) cards perform the various scaling, layer effects, and image compositing operations within the Event Master series of products. The internal cross point routes all video signals to and from the VPU cards. The VPU cards have no external connections.
Each VPU card is a 4K scalar capable of acting as a 4K scalar, or as two (2) Dual Link scalars, or as four (4) 2K HD scalars
| Mixing Layer Type | Maximum number of Single Layers/Mixing Layers | ||||
| E2 | E2 Jr. | S3–4K | S3–4K Jr. | EX | |
| 2K HD | 32/16 | 16/8 | 8/4 | 4/2 | Up to 16/8 |
| Dual Link | 16/8 | 8/4 | 4/2 | 2/1 | Up to 8/4 |
| 4K | 8/4 | 4/2 | 2/1 | NA | Up to 4/2 |
The VPU cards are not accessible from the rear panel on E2 and E2 Jr. units. Even though they have no external connections, slots 2 and 3 are reserved for VPU cards on S3–4K and S3–4K Jr. units. The EX expansion box can have a combination of Input and Output cards, or it can have two VPU cards.