dont use cheap sttuff to connect a miner!
http://www.hardocp.com/article/2014/12/11/evga_supernova_1300_g2_1300w_power_supply_review#.VQaepstZuCU
knc also send a connector to connect 2 PCI-E to 1..... you can also use theese http://www.ebay.com/itm/Official-KncMiner-Y-Cable-PCI-E-5-Pack-for-KnC-Titan-Neptune-Power-Cable-Adapter-/261696076264.
dont play with cheap power supplys they wiull burn you miner!

I will post undervolt pics later some cores runs as low as -0.0837

indication -0.0x the more > the value the lower the voltage! -0.1400 is lower then -0.0366 so start as low as -0.09x or even lower end just switch up til one core starts , but before you do this flash to FW 1.06s !
if core starts remember to voltage do so qith all cores ,, to get the minimum , if a core acts instable you can go +1 up from minimum.
I also defalted all cores to 500 mhz so the minimum foor 500mhz is found.
be pacvient sometimes cores doe start in 2 minutes , but that you can see by the amerage , it will go over 1 ampt , end will go up down etc... and than it kicks in to +40 amps.....
al core are diffrent so some are very sensitive so can have very little volt and some need more.
It proffs that the 20nm precede is far from perfect , this is why some cores run more hot then others , but by undervolting them you can solve a lot of this problem.
and again you NEEED a proper power supply for this ,, like I said a standard consumer supply will not do!
id needs to be 80 gold ceritifies as the EVGA SuperNOVA 1300 G2 1300W is.

And if you are not willing or understanding how  to do that you can reealy better sell your bonus neptune on ebay . because otherwise you will just burn it!
Iam sorry , but thats IMO the fault knc made , they thougt all custumers were Highly tech poepole that understand , software icm with asic technology icm with electronics..... for example the voltage sinus of a cheap power supply is not good.
here see why! https://www.youtube.com/watch?v=T-jG3vqRQHM as you can see the cheap PSU does wired things.....

https://www.youtube.com/watch?v=-mwV7YYiVT0 for knc you need gold!

https://www.youtube.com/watch?v=mCmLAtHcpdY (watch the osiloscope!!!!!) a bad psu will deliver crap osiloscope outputs!

I spoke too soon.  Got a reply today.  Authorized KnCMiner Forum is NOT in the plans to return:

Generally for all Neptunes and Titans I recommend good quality cables and connectors to keep them running reliably. Like a good 16AWG y-cable. I have mine done by Shakmods, running non-stop since September @ 500MHz "burn-less"

BONUS NEPTUNE OWNERS BEWARE!

As mentioned before, the Bonus Neptunes do not have thermalpads on PWM modules and the included fans do not provide enough airflow.

But here comes the good part, there are other "bonus" features:

Badly installed heatsink with bad contact to ASIC heatspreader
http://abload.de/img/r00203371uol1.jpg

Someone during assembly left a Torx screwdriver head inside the Neptune Cube! Shorting circuits FTW!
http://abload.de/img/r0020338xwscl.jpg

I have never seen such an amateur work, and I am deeply disappointed. Apart from the ASIC chip itself, KNC machines look like a high-school science project.

Thanks for the tips. Undervolt to 3.8TH/s? My old Neppy only gives 3.4TH/s @ 1990W... are the bonus ones more efficient?

Also: Damn, my old Neppy controller "died" last night. The display screen comes on, but remains blank and the system doesn't boot up.

Hopefully it's just a software issue. Is there a way to recover using a micro-SD card or something?

Here the titan instructions.
http://www.kncminer.com/support/titan-setup-and-firmware




Titan Setup and Firmware

Titan Setup guide can be downloaded here

Information on how to correctly set up the Y adapter cables here:

Change log for all our Titan firmware releases available on our GitHub page here: https://github.com/KnCMiner/titan/releases

Titan Firmware update:

Titan Firmware 2.00 release

Older Firmware versions:

Titan Firmware 1.97 release
Titan Firmware 1.96 release
Titan Firmware 1.95 release
Titan Firmware 1.15 release
Titan Firmware 1.14 release
Titan Firmware 1.11 release
Titan Firmware 1.10 release
Titan Firmware 1.05 release
Titan Firmware 1.04 release
Titan Firmware 1.03 release
Titan Firmware 1.02 release

Titan SD recovery method.

Download the Titan SD recovery .img file https://github.com/KnCMiner/titan/releases/download/v2.00/titan-2.00.img (This file is only to be used to recover a corrupted SD image, instructions on how to use this file are below)

1. Turn off the miner and remove the Micro SD card from the Raspberry Pi. Place the SD card in to your SD card reader
2. Unzip/extract the files form the .img file you downloaded

3. Write the .img file to the SD card (instructions below)

•Follow this link if you are using Windows for instructions on how to write the image to the SD Card http://www.raspberrypi.org/documentation/installation/installing-images/windows.md
•Follow this link if you are using MAC for instructions on how to write the image to the SD card: http://www.raspberrypi.org/documentation/installation/installing-images/mac.md
•Follow this link if you are using Linux for instructions on how to write the image to the SD card: http://www.raspberrypi.org/documentation/installation/installing-images/linux.md

5. Insert the newly imaged SD card back into your Raspberry Pi and turn on the miner.

Details on Titan and Titan Cube:

Each ”Titan” consists of 4 cubes + 1 controller card box.

Each Titan miner consists of four 28nm chips, each chip comes in a sturdy enclosure and packaging, including fan cooling.

The performance of the batch 1 Titan miners is 300+ MH/s while consuming approx. 1100 Watts.

Power

The recommended PSU set up per Titan is 2 x 850w power supplies. One 6-pin connector is required per Cube, and there are 4 Cubes altogether on a Titan, plus a controller board in it's own box. They can all draw their power from 2 x 850w PSU:s

The PSU PCIe-connector required is a 45750 Mini-Fit® Plus HCS Crimp Terminal Crimped to 16 AWG wire.

(We will be providing additional Y cables for the Titan miners at a later date which will allow a greater range of power supplies and cables to be used)

Each Titan Cube uses a high-quality PCI-E-type connection and draws approximately 270 watts at it’s port, depending on firmware settings and updates (subject to change).

These ports are fan-cooled and can handle the power (rated 13A), but make sure you’re using high-quality PSU:s, connectors and cables. Be careful when inserting and removing connectors as wear and tear may damage connectors. The act of inserting/removing cable connectors into ports degrades connection surfaces every time it’s done and should be minimized.

We’re continuously optimizing the Titan firmware and some of the figures here may change slightly due to updates as we’re fine-tuning for best possible performance.

micro sd needs to be 4mb or 8mb and formated fat32
unzip the files on the sd card , thats it.

I use Sandisk 8gb Class 10's ...I just got 5 new in package the 48ms or whatever versions micro SD's on ebay for total price with shipping of $34 bucks.

http://www.ebay.com/itm/330901274432?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

anyway the above ebay seller came thru ...exactly as advertised...I thought the price was pretty good...to anyone looking. But I definitely get a 4gb or 8gb and make sure they are class 10 microSD's in my view. (my original that came with the Titan from KNC was a Kingsington 4gb class 4 piece of crap that died a week after I got it...just saying)

i always do a complete reformat on upgrades ..keeping the last upgrade SD as a set aside/spare ..in this case 1.97 as a catastrophic backup.ie I don't like the version I just tried or it don't work ...to my satisfaction.....i simply pop the old microSD back in...

got the 5 pack due to having 2 Titans now....not that KNC is gonna offer ANY upgrades above the
Titan 2.00 firmware imho (perhaps a bunch of upgrades for the new board/better more robust supposed chip versions in batch 2 for 400mh if/when ever
the ship them...likely imho not backward compatible....if they really did change the boards....but with the IMAGE of 2.00 I bet it is the last upgrade for batch 1 units from KNC...my guess anyway.

dang still wish i would have archived the knc forums site the last i can find on wayback machine was like 0ct 6th if I remember 2014 and they simply refer to the fact that
the titan bricks were not working at that point in time and catching on fire etc (fun times).

Gonna be a real pain in the ass for Titan 2nd batch customers.... if the only way they can get official knc support is via email...hopefully they will trip over this
support thread via google...lord knows i suspect they are gonna need help from those on this thread badly!

I am constantly surprised at KNC's actions...you'd think that would have passed by now....go figure....still they always manage to ratchet the whole fiasco ..just that one notch
deeper into the depths of darkness...BFL imho was a scam ...but the ego of those guys was such I think they actually thought they could get their equipment out in time (till they could not) as to KNC the whole thing from day one seems to have been a well planned and executed scam to get their data hall made with the 1st gen units and screw us out of all the $$$ they could till they walked...BFL was completely clueless and KNC was completely methodical in their quest for ...as sam cole puts it .. to control 40% of all mining of bitcoin.

well 'eventually' my 2 Titans will mine themselves into 'doorstop' status like the knc jupiter and I can put this whole experience far behind into the fog of 20/20 oops!..hindsight..
(now I know what former cult members feel like and/or former amway salespeople have to go thru..the horror!)

whatever....got to admit thou as evil genius plans go...it rates right up their in $$$ and evilness..well played knc well played......

The only way to test them are on computer slot to measure the speeds.  On Android phones the OS is limits  the speed and cache for the sd card and internal memory to conserve resources

I had four cubes that had dead dies.  I shipped in three of them six weeks ago and still have not heard when they are coming back.

Thieves.

http://www.timeanddate.com/countdown/generic?iso=20150203T1330&p0=239&msg=How+Long+Does+it+Take+KnCMiner+to+Repair+Titan+Cubes%3F++In+my+case+so+far...&swk=1