I'm not sure what temperature Speccy is picking up as "motherboard" temp but it's not going to be overall case temperature. Could be the VRM possibly. Could you download HWMonitor and post a screenshot from it. I think it might pick up more sensors than Speccy does. The CPU temperature while gaming of 60 degrees is not bad, considering it appears to using the bundled cooler which is poor. If you want to improve CPU temps, upgrade the cooler. Almost any aftermarket cooler will be better than the one bundled with the CPU, and the case accommodates coolers up to 160mm tall according to the spec sheet.
Improving the routing of your wiring may also help airflow (try to see if it's possible to route some of it under the motherboard tray - that's what the oval holes cut into the tray are for), as will installing a 120mm intake fan in the front of the case.
Edited by jonuk76, 09 March 2014 - 05:58 PM.