power supplu failure

Just got a new psu, after install my pc beeped for about 3 times, cleared cmos, it started up fine. I then began to run one of my games, and i found that my pc had completely locked up for a good 10seconds it then restarted, hit the logon screen froze and restarted,
ANYWAYS i'm assuming i got a faulty psu.
Can anyone confirm that this is a faulty psu?
CPU:i5-3570k @ 4.6Ghz
GPU:GTX770 Windforce OC 4GB
Mobo: asrock extreme 4 z77
PSU:Rosewill HIVE 750W
RAM:16GB Team @2122Mhz
OS:Win8.1 Pro
I know find that alot of my programs i'm running seem to crash every now and then, assuming thats a RAM related problem, but this all started after i installed the new psu
EVENT LOG VIEWER
"Log Name: System
Source: Microsoft-Windows-Kernel-Power
Date: 8/8/2014 4:58:08 PM
Event ID: 41
Task Category: (63)
Level: Critical
Keywords: (2)
User: SYSTEM
Computer: MTGR-01
Description:
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" />
<EventID>41</EventID>
<Version>3</Version>
<Level>1</Level>
<Task>63</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000002</Keywords>
<TimeCreated SystemTime="2014-08-08T23:58:08.395594200Z" />
<EventRecordID>4934</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>MTGR-01</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="BugcheckCode">0</Data>
<Data Name="BugcheckParameter1">0x0</Data>
<Data Name="BugcheckParameter2">0x0</Data>
<Data Name="BugcheckParameter3">0x0</Data>
<Data Name="BugcheckParameter4">0x0</Data>
<Data Name="SleepInProgress">0</Data>
<Data Name="PowerButtonTimestamp">0</Data>
<Data Name="BootAppStatus">0</Data>
</EventData>
</Event>"