6gb is fine for most normal uses, find 8gb limiting on my laptop for some cad work i do, so will be upping that to 16gb when i can be bothered. Server likes to have more too, but thats simply due to whats running on it.
My advice, check your usage, and see how much you are using, if its hitting 80%+ regularly, upgrade.
My advice, check your usage, and see how much you are using, if its hitting 80%+ regularly, upgrade.