To get Turbo to work it "should" be as simple as:
Set your CPU Clock Ratio to 21 or Auto.
Set Intel Turbo Boost Techn. to Enabled
Set CPU Multi-Threading to Enabled (ok, not necessarily required but you want 8 threads right?)
Set CPU Enhanced Halt State (C1E) to Enabled
Set C3/C6/C7 State Support to Enabled
I don't believe you need to set EIST to Enabled, but if you want your power savings to kick in at idle then you should set it to Enabled.
To test Turbo, download Prime95. Start Prime95 on one thread only. Open Task Manager and go to the Performance tab. As others have described you should see 1 thread running at 100% while the other 7 run near 0. If they are not staying at 0 this will impact your Turbo. Kill as many open programs as you can, in particular any anti-virus or background software you have running just to be sure.
Now open CPU-Z. The latest version is 1.53.1. If you have the first thread in Prime95 running full speed (as seen in Task Manager), then you should see your multiplier going past 23. On the CPU tab you can right click on the CPU-Z screen and it will give you the option of showing the details for one of the other cores. Select the core running your P95 thread, or check out all 4 cores. When you look at the core running the P95 thread you should see it (best case) hit a multiplier of x26 and speed of ~3.46GHz.
As already mentioned, Turbo increases the multiplier based on the number of active cores and the thermal envelope. You must be sure other threads are not running, and that your CPU is not running too hot. Run a program like RealTemp to be sure you have low temps across the inactive cores.