E5 v3 CPU have a "feature" to allow max turbo with all cores.
See What controls Turbo Core in Xeons?
For the past month, I had successfully flash my Asrock , GigaByte , MSI board bios to "all cores max turbo"
There is a nice person at anandtech.com that would mod the bios with "all core turbo" and reduce cpu voltage.
The net result ( for some E5 v3 CPU ) is over 10% with the same power usage.
Example of a single CPU E5-2673 v3 , all core turbo to 3.1GHZ
Model name: Intel(R) Xeon(R) CPU E5-2673 v3 @ 2.40GHz
Stepping: 2
CPU MHz: 3099.937
CPU max MHz: 3100.0000
CPU min MHz: 1200.0000
Hashrate went from around 590 H/s to 657 H/s without using extra power.
Next up is do the same mod to dual CPU server board, it is more risky.
I like Asrock board , it has dual bios , bios chip is removable from socket, making it fool proof , impossible to brick the motherboard.
See What controls Turbo Core in Xeons?
For the past month, I had successfully flash my Asrock , GigaByte , MSI board bios to "all cores max turbo"
There is a nice person at anandtech.com that would mod the bios with "all core turbo" and reduce cpu voltage.
The net result ( for some E5 v3 CPU ) is over 10% with the same power usage.
Example of a single CPU E5-2673 v3 , all core turbo to 3.1GHZ
Model name: Intel(R) Xeon(R) CPU E5-2673 v3 @ 2.40GHz
Stepping: 2
CPU MHz: 3099.937
CPU max MHz: 3100.0000
CPU min MHz: 1200.0000
Hashrate went from around 590 H/s to 657 H/s without using extra power.
Next up is do the same mod to dual CPU server board, it is more risky.
I like Asrock board , it has dual bios , bios chip is removable from socket, making it fool proof , impossible to brick the motherboard.