am i overworking my psu ?

Is your system crashing? No. Then the PSU is fine, speedfan is misreporting and a new PSU will be a waste of cash. A system like yours wont draw more than 400W at the wall including PSU inefficiency losses.

That PSU calculator is very clever ploy by PSU manufacturers to make you buy PSUs with about 2x the power you need.
 
That's the difference between a 600W psu and a 600W psu. The first is the el-cheapo that'll go up in a puff of smoke at the first sign of a sweaty processor, the second will give it the old 'that all you got limp-boy' when you load it up. If you buy cheap psu's then the guide is an absolute minimum (and even then I'd have a good BCF extinguisher handy :eek: ) - if you buy quality, then even the old 460W'ers will probably see you good.

However, the only way to be really sure is to get a multimeter - My old XP-m ran off a rubbish 460W and clocked properly the 12v rail looked like a heart monitor trace - killed my stability and hugely reduced my clocks - but it was only a problem when the PSU was straining! Plug in a multimeter and you will get an accurate ideal of what's going on - then clock the nuts off it and see if your PSU really is enough!
 
Inded, and that's why a qualiy (pc&p, zippy, silverstone, etc) 510W+ PSU will happily run a dual-core + crossfire rig while a thermaltake 600W will probably catch fire =p
 
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