hye guys.. want to ask is it ok what I got here ? and how I want to know is it stable

i just download and test it using occt.. so how can i know is it stabil or not ? sorry for noob question bro..huhu

how to increase the voltage bro ? im using amd catalyst as a medium for the overclock.. i cant find any setting to increase the voltage .. huhu

Btw this is my system info

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System Information
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Time of this report: 8/11/2014, 03:00:01
Operating System: Windows 8.1 Pro 64-bit (6.3, Build 9600) (9600.winblue_gdr.140330-1035)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 09/03/13 14:55:56 Ver: 04.06.04
Processor: AMD A6-3500 APU with Radeon™ HD Graphics (3 CPUs), ~2.1GHz
Memory: 8192MB RAM
Available OS Memory: 8188MB RAM
Page File: 3770MB used, 5697MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.03.9600.16384 64bit Unicode

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Display Devices
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Card name: AMD Radeon HD 7900 Series
Manufacturer: Advanced Micro Devices, Inc.
Chip type: ATI display adapter (0x679A)
DAC type: Internal DAC(400MHz)
Device Type: Full Device
Device Key: Enum\PCI\VEN_1002&DEV_679A&SUBSYS_3000174B&REV_00
Display Memory: 6894 MB
Dedicated Memory: 3054 MB
Shared Memory: 3840 MB
Current Mode: 1600 x 900 (32 bit) (60Hz)
Monitor Name: Generic Non-PnP Monitor