Ok, here's the deal. Under Intel document about E8000 series processors I've found that max vCore and VTT are 1.45V (with vDrop) here:

Code:
http://download.intel.com/design/processor/datashts/318732.pdf
On page 17. But under processor specific finder for E8500 says max voltage of 1.3625V.

And what about VTT or CPU FSB voltage than? Is it 1.45V?