Welcome Frank,
Great little powerful workstation. Have no fear.... below is a picture of your motherboard (a moderator needs to release images so this might take a bit of time to see). You can also google Z230 motherboard and click on images to see. They all do not have a heatsink on that.
For others.... it is the square chipset you can see exposed down by the bottom right area where the 5 internal SATA ports are clustered, between the two PCIe slot ends a little to the right of midline:
