Topic: [CLOSED]Minion Chip Assembly GB - page 8. (Read 77309 times)

The clamping solution for coolers with AMD style clamp:

http://s17.postimg.org/8g0irfb2j/20141007_141509.jpg

http://s17.postimg.org/6x54mg4i3/20141007_141548.jpg

http://s17.postimg.org/n9f6c6itn/20141007_141623.jpg

http://s17.postimg.org/4xoiv1a6j/20141007_141640.jpg

Hi,
WE tested especially for you :
setting 1016/805 - 405 Ghs - 438 W @ the wall

Any chance of the stock settings at the wall please.

Hi,
We just made mesurment with 2 boards - small and big caps
Result
@ 930/780 mV is exactly
397-403 W per board with HP 1000W server PSU.
Got the same result with  1200 W standard PC ATX PSU.
Mesurments made with killawat @ the wall
355-365 GHs each board

Regards: Vesi

Interesting spreadsheet. Can you try 400mhz at 860mv?

It should burn about 294W by my numbers. It should also hash at the same speed and the efficiency would be shit but if it burns way more or way less than that it might tell us where to look.

Technobit,


What happend to the boards? efficiency is terrible..


Setup:

- PSU = IBM DSP-2000BB
- 2x HEX4m board (1 connected and running)
- Voltcraft energylogger 4000
- TP-link
- 2x 40mm 13000 rpm fans for cooling the PSU (rpm at about 4000)
- Freezer 7 pro heatsinks for the minion chips.



my results so far:

Efficiency [W/GH]



Hashrate [GH/s]



Power usage [W] or [J/s]



Error rate [%]


0 = NOT STABLE or NOT WORKING

I have run 2 board from the PSU to put more load on it to check if my prefomance would increase do to better PSU efficiency but i only got a 3% better result !!

Hi,
I'll try to put lsit of good working setups clock/voltage tommrow
The best balance by our opinion is 930/760-780 mv

Regards: Vesi

There was some info in the review for undervolting it drop the mv in the tplink just play with the settings.

Are you using it for a single board?

It is a great psu and I have 8 of them waiting but a single undeclocked board might be a too small load, see here (it is for the 2500W one but they are similar):

http://www.rcgroups.com/forums/showpost.php?s=ff664b0f8735ce2a9c40796f40b57c49&p=18117345&postcount=611


It would be great if you could measure volts and amps at the 12V rail or if you could add more load to the psu if you are using one board.

If that is not the case it is strange, crappy voltage regulators should get way more inefficient as the load increases exagerating the advantage of the underclocking so it can't be that. Having less capacitors might increase the ripple, overshoot and undershoot but it shouldn't wreak havok with the efficiency. The only way I can picture the dc-dc converters drawing a lot of extra power due to having less capacitors and it being more noticeable with more underclocking is if marto increased that dc-dc converter frequency a lot to compensate for the loss of capacitance and that forced him to increase the gate drive of the mosfets to insane levels wasting a ton of power driving them. I have done that wasting up to 20W per mosfet in a high voltage generator but it required a discrete gate drive circuit, I have never seen anything like that in computer hardware and it would be insane if you cared about efficiency or even cost as caps are cheaper than building discrete gate drives.

Im using a IBM DPS-2000BB (2000W PSU). im measuring the power draw from the wall using a voltcraft energy logger 4000.

Ill post some results im getting later.. but till now the efficientcy is quite dissapoiting.. o ps my psu is around 0.96 Cos Phi regarding efficientcy of the unit it a realy good PSU and not putting out a lot of heat so that means its efficient!

vesi enjoy your election

and i would like an update on my order too. like everyone else who has been waiting along time

HI,
Today is Sunday and election day here .
I'll be able to update tomorrow.

Regards: Vesi

Vesi please check your pm from me.
Please update the status of my boards.

You would have to be using a pretty shitty PSU to see a 15% difference between even a Platinum PSU operating in its most efficient zone (92-93%) and a crap PSU fully loaded. You're talking about <80% efficiency.

Hi,
There is no difference in terms of power efficiency
between the bom with a lot of caps ( it was intended for 8 chip version) and this one .
IF you use bigger  PSU you can see about 15% difference.
Als check again 2 good measurements @ the wall .

Best Vesi

What got changed on the boards we are getting and the one user 2good received ?

For one im seeing a lot less capacitors on the board
and im tsting the board now on all diff kind of clock setings and voltage settings.. but im not nearly getting the "Good" efficientcy number as 2good was getting with undervolting!!

Marto did you reduce your BOM to save money with a result a less efficient miner..

the most efficient im getting now is 1,08 W/GH and thats 660mV 400Mhz or
1,13W/GH 760mV 700MHz


that no where near the 0,78 2good was getting !!!

What Is my  status update vesi?

Martin told me last week that shipping was for this past Monday.

What is my update?

Hi,
I'm Vesi from technobit.
Martin will not be able to post in the forum for some time
So I'll do my best to answer your questions
You still can contact us here on PM or e-mail [email protected]

Regards: Vesi

Martin,

It would be nice to give us your contact / username on wich we can reach you !

The standard Intel 1150 sinks fit if you remove the pushpin and locker thing, it can be mounted by using the screws and plastic pipes that hold the brackets that only serve Arctic Coooling Freezers 7. They however don't touch the chips so I need to buy copper 15x15mm x 1mm spacers. Bummer, at least a week waiting.

Bobsag3, please work on the shipping refund.