Just wanted to point out not all systems are the same. Even if you have the exact same motherboard/CPU combo, there are other variables that are at play. As we have seen with all of our systems.
For instance
ajschot's system, I honestly don't know why my setup can sustain higher turbos since we share the same motherboard and processor. At that point I want to say cooling, power supply, and probably the CPU itself is taken into consideration.
Even though we both run 2696, mine might run at lower volts and run cooler allowing it to turbo higher. Also my power supply is complete overkill for my setup (EVGA 1300W G2), maybe it could provide cleaner power. The 2696 under AVX load can reach 300W (maybe higher). CPU cooling as well, I run a 280 AIO.
Don't try to compare one system to another even though they are similar setups. All we can do is help each you reach the maximum your system can reach.
At the end of the day wether your particular processor turbos to 3.0 or 3.4 all core, it is a huge step from the 2.4-2.8 it was with out the mod.
Also Dufus (we owe that dude a lot for bringing this to light) mentioned at another forum that if we were to experiment with the BIOS we should be able to release any restriction theoretically hit the max core turbo on all cores. Not having the need for the EFI driver. I personally never tinkered this deeply with the BIOS, so I am completely green when it comes to this. I will say this though, if the 2696 was able to run at 3.8 on all cores it will need beefy VRMs.