Quote from: ultrix on November 15, 2013, 07:24:25 PM

Quote from: Bitcoinorama on November 15, 2013, 12:36:16 PM

Quote from: btc_uzr on November 15, 2013, 12:11:28 PM

Quote from: Bitcoinorama on November 15, 2013, 11:47:56 AM

Yo, 1200W Gold rated PSUs November orders FTW pls! Wink

So KnC recommends 1200W PSU for the November batch ?

Why would you doubt me??

I doubt you because you made a non-technical correlation between two KNC customers and an unrelated forum post saying that the same brand had popped a motherboard. News flash, every manufactured PSU on the planet has popped a motherboard, usually to no fault of its own. Further the HX850 is a very stable PSU, we use them for 12V supplies in the lab and its what I have run on a dozen Jupiters for over a month.
One thing I did notice, which I overlooked in the product pictures during ordering is that KNC did not properly ground each ASIC board. The PCI SIG clearly states that 6 pin auxiliary connectors are for 75W draw and 8 pin added two additional grounds, making it _SAFE_ to draw up to 150W. Note: don't be a moron and read the spec incorrectly, the PCIe edge connector itself can deliver 75W, the 6 pin aux gives an _additional_ 75W, for a total of 150W.

The reason people have been popping boards is the combination of sloppy AC and the boards drawing too much power with not enough ground. It has little to do with choice of power supply. I altered my boards by scratching off a portion of the solder mask and soldering the additional two grounds. Then I sampled the VRM output voltage for two hours. End result less jitter. And I'm running off of 208V synthesized AC from a large bank of Liebert equipment.

Long story short, if it didn't come straight from KNC's mouth, don't believe Orama's non-nonsensical, uneducated babbling. KNC never recommended one brand over another, the only thing they indicated was a minimum capacity, which was 850W. Until they post somehting on their website, ignore Orama.

Actually I sat in a room one Saturday with General Electric's Critical Power Specialist who flew in specifically to address the issue, i'd wager he knows what he's talking about and the HX has fried components at a with a statistically significant reason for concern according to other posts on the internet. It's not solely limited to KnC boards.

When the PSU is tripped and you have to replace the ATX lead, unlike with other brands, or even other ranges of Corsair PSUs, the HX series restarts with current apparently at full load. If the reason that caused the fail safe to cut the PSU still exists that component is then place under greater stress then beforehand, where as typically other PSUs ramp the current after being reset.

If you't care to believe what i'm saying, then fine. I didn't have to ask further questions in the first place. We could have just bluntly said do not use the Corsair HX PSU and be done with it. At the time the thread was so full of competitors trolls attempting to discredit the company for not checking every PSU on the planet despite purposefully recommending one in particular as it had been thoroughly tested.

I'm not attempting to be smarter than an armchair engineer, i'm relaying what I remember from a conversation with an industry expert.

In any case there were less than ten boards out of however many thousand made that suffered from this. It's a total non-issue, but to err on the side of caution we suggest you refrain from using that PSU.