Is My 550w Too Small Now?

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Joined
25 Oct 2009
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46
Chaps!

I'm concerned with my recent upgrades my psu might now be powerful enough to run everything. I've been experiencing some slow downs and errors but I think they could be other things. I don't know how to work out the wattage need of my pc.

I'm running a 550w OCT ZT Series with the following

1 3gb HDD
1 512GB SSD
1 Xonar d2x audio device
6 2gb sticks of ram
1 i7 920 2.6 overclocked to 3 (but could easily go higher with my. ..)
1 i80 liquid cooling heat sink
1 r9 270x gfx card

is that too much or should by psu be fine? The xonar keeps giving me error messages about the power not being plugged in but I've noticed no issues with the sound and a good bit of google let me know this was a common issue with the xonar d2x.
 
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