Yes, it's normal for Condusiv Technologies ExpressCache to use that much system memory.
In most cases, I'd recommend using Intel Smart Response Technology instead, but it requires a minimum of a 16GB SSD.
Another alternative is moving your hibernation file (hiberfil.sys) location to the SSD. This requires no software, and allows your laptop to go in and out of hibernation (aka "suspend to disk") very quickly. This is how a lot of Sandy Bridge-based Ultrabooks were configured by the manufacturer.