Event log errors on my OCUK overclocked bundle

[silkocuk]

I've recently been getting sporadic BSODs and noticed these in my event log. Should I be concerned? Another thing to note is I bought an i7 930 2.8 oc'd to 4.0 bundle, yet it's always shown as 4.2 - has it been clocked too far?

Event[462]:
Log Name: System
Source: Microsoft-Windows-WHEA-Logger
Date: 2011-05-12T08:35:00.604
Event ID: 18
Task: N/A
Level: Error
Opcode: Info
Keyword: N/A
User: S-1-5-19
User Name: NT AUTHORITY\LOCAL SERVICE
Computer: SilkPC
Description:
A fatal hardware error has occurred.

Reported by component: Processor Core
Error Source: Machine Check Exception
Error Type: Internal Timer Error
Processor ID: 6

I've owned the gear for 13 months now, first 10 months it was fine.