PC starts beeping when gaming

Dear Experts

My home PC runs perfectly fine when browsing the net, word processing and watching videos. But when it comes to playing some graphically intensive games it then starts beeping at around 20 second intervals at me. I've noticed that at each beep there is a very quick screen flicker. The actual game still runs smoothly, no slowdown or anything.

PC Spec:
ASRock ConRoeXFire-eSATA2
ATI Radeon x1950 Pro 256MB
4GB RAM
Intel Core 2 Duo 6320
PC Case has 2 fans
Idle temp of Gfx card 59C & latest drivers

Is there anyway of turning the beeping off? If its due to overheating is there anyway of increasing the threshold?
Bladey001Asked:
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truromeo4julietCommented:
the x1950 was one of the biggest power hogs of it's day... I'd upgrade to a newer 600W PSU... you can keep your old one for backup purposes, but i'm almost certain you need more juice. My x4870 beeped at me prior to getting my 2nd power supply.
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truromeo4julietCommented:
sounds like your graphics card isn't getting enough juice from your power supply... you listed all your specs but not your power supply wattage and type... Make/Model/Wattage please!!
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☠ MASQ ☠Commented:

As said check both the PSU rating and output to the x1950.  Ensure the power connector to the grphics card is secure.
System beeps like this could also be the CPU overheating, try to monitor your system temperatures while stressing the PC it could be you need to replace the paste between the CPU and heatsink.
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Bladey001Author Commented:
The power supply is a Jeantech Orchid 500W.

Have checked the power connector and is seated correctly. Have also removed dust inside the case using a can of air duster.

How can i check whether there is enough power output to the x1950?
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nobusCommented:
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Bladey001Author Commented:
Have upgraded my PSU to a 650W and pleased to say no beeps since!

Thanks!
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