Here is the max that I can get without kill the chip and just using multiplier.

CPU Model: AMD Phenom II X6 1090T BE
CPU Stepping: ----------
CPU Frequency: 4630.82 MHz
CPU vCore: 1.6V
CPU Multiplier: 23x
CPU Turbo: Disabled
CPU NB Speed: 3000 MHz
HT Ref Speed: 2000 MHz
RAM Speed: DDR3-1600
RAM Timings: 8-8-8-20-1T
RAM Configuration: 4 GB (2 x 2 GB)
RAM vDIMM: 1.65V
Motherboard: Gigabyte 890FXA-UD5 Rev. 2.0
Chipset/Socket: AM3, 890FX + SB850
Cooling: Water (EK Supreme HF + MCR320-QP + MCP655-D)
Temps: 35ºC Idle / --C Load
Operating System: Windows 7
32/64-Bit: 64
Stable/Suicide/Untested: Unstable

Link to CPU-Z validation: http://valid.canardpc.com/show_oc.php?id=1628727