Oops... I see what you are saying... I had a small typo on the motherboard model... It's GA-MA790XT-UD4P
Sorry guys for the mistake. Yes, this one uses DDR3 only. And I know it goes beyond 16Gb because I filled the 2 empty slots with 2x 4Gb chips and it upped the memory to 24Gb. So... I'm assuming there should be no problem from 24 to 32.
When I started windows and was running boinc SAT@Home WU's the free memory count on the task manager was up to 20Gb (out of 24)... when the first BURP workunit landed on boinc that value dropped to about 5 Gb.Between BURP memory hogging and Windows file caching almost the whole amount disappeared!