It may be limited by thermal throttling or power constraints.
It may be limited by thermal throttling or power constraints.
And using just one CPU works on Linux too? Have you refreshed the BIOS? If nothing helps, it might be an issue with the motherboard...
What kind of program are you using? Certain tools can only handle half a socket or may not be built for full compatibility.
For those new to the setup, keep the discussion concise and skip unnecessary replies.