I remember being called up one day over speed on descent in a PA31, I'd filed 165kts TAS (I think, memory a bit rusty), but was going quite a bit quicker. They do notice.
But it's nothing to do with your TAS filed and TAS doing.
We notice when a PA31 gets a ground speed above 230Kts (without a huge tailwind); or when you are catching a Dash 8 or a jet on a similar track.
As an ATC it's never about TAS; that's what our system uses (really badly); we'll be concentrating on your IAS and or your ground speed.