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Author Topic: Can BeQuiet straightpower e9 700w take full load 24/7?  (Read 700 times)
twoBitBasher
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February 09, 2012, 12:51:07 AM
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I've got this new PSU from BeQuiet and it is internally nearly identical to FSP Aurum, which is better known I guess.

The question is can I risk running the PSU at 94%(655w) load 24/7?

It's supposed to have up to 91% efficiency at full load. Most PSU:s aren't built to take such a beating but around 60-70% of their rated max I guess. So what do you think is it high quality enough to manage it?

Thanks for your input in advance! Cheesy

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Miner612
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February 09, 2012, 01:02:39 AM
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I am not familiar with that PSU.  Is it single 12v rail?  Energy rated?

I buy and sell GPUs, most 5850s and 7970s. 
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twoBitBasher
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February 09, 2012, 01:24:44 AM
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some reviews I found said it had a tad worse ripple and noise on the 12v rail under 100% load than on some premium PSU:s like Enermax, Seasonic. It could be loaded up to 800W while the 12v rail power quality would still be just inside the norms.
The PCI-E cables(they are the ones that count, right?) are powerd by 2x22A rated 12v rails and according to the tests there's quite a bit of leeway until OCP kicks in. The PSU is 80+ Gold certified.

But hey all(most) PSU:s are really single 12v rail designs, the "independent" rails have just been separately protected with OCP and such.

If by "energy rated" you mean: does OCP kick in at some point, then yes.

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Miner612
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February 09, 2012, 05:15:43 AM
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I meant like Bronze, Silver or Gold rated.

And as far as I know ... single rail PSUs are the best for mining rigs.  Not multi rail.

I buy and sell GPUs, most 5850s and 7970s. 
jimzolorenzo@gmail.com  -- Make an offer.
http://myworld.ebay.com/i_buy_5850s  -- current inventory
I have a couple bare bone mining rigs for sale as well.

--------------

I bought silver from [ccliu] 5 star transaction!
I bought silver from [TECSHARE] -- shipping still
twoBitBasher
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February 23, 2012, 01:18:47 AM
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Do you guys run your PSU:s at their rated max? any problems?
A gold certified PSU like this e9 doesn't really lose too much of its efficiency either. Just 93% ->91% while on full load.

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jake262144
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February 23, 2012, 09:54:40 AM
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Can any device run at 100% indefinitely? Any weaknesses the PSU might have will make themselves known.
If it's flawlessly built doesn't suffer from inadequate ventilation, I don't see why it would not.

The FSP-manufacured Be-Quiet! e9 700W PSU is a four rail device, meaning you will have to figure out how best to wire your cards. One of those rails will feed the CPU, the manual or manufacturer's specifications should tell you which one. Use the remaining rails for feeding GPUs.
The the OCP protection chip overseeing those rails is configured to trigger at 18A (216W), 18A, 22A and 22A (264W) but of course you can't apply such load to all rails without seriously overloading the PSU.

Remember that it's not prudent to run close to 100% load - should AMD screw up the next driver version and reintroduce some flavor of the infamous CPU bug, the CPU will require additional power possibly overloading the PSU.
The same goes for underclocked memory/undervolted core - should you lose your configuration (e.g. while testing another miner) the power usage of the whole rig might rise.
I use a kill-a-watt clone to make sure I don't run any rig at over 80-90% load capacity for this very reason.
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