Help i.d the beep

[Firenfry]

Hi hope someone can help this is a recent problem my pc beeps at around 60% cpu load i have no idea what it could be caused by and made a short vid and uploaded it to youtube the sound its at about 40 seconds into the clip.
thanks.

 

[clutchc]

How many long/short beeps was that and what is the make/model of the motherboard?