Topic: Repasting sp20 spoondolies? - page 2. (Read 2927 times)

I'll be honest, I have nothing productive at all to add to this discussion. But I read the subject title every time I refresh the forum page and it's making me hungry.

http://www.merriam-webster.com/dictionary/repast

Putting aside the various types of thermal paste and such, how do I determine the physical location of a specific ASIC based on it's number and Loop number? I have one ASIC (i.e. ASIC #7) that runs hotter than all the others. I am pretty sure that 0-3 are one board, and 4-7 are on the other. I am almost certain that ASIC #7 is the "last before the" hot air exits the SP20. I have though that when I ramp back up after the summer months here in the USA, I might consider doing a "paste job", but would like to do it on the correct one.

Ant specific guidance or diagrams on this?

Glad that you found humor in this thread. Sigs are cool, and a fact on this group

I do not think I compared MG thermal stuff with AS5.
All I did was remove one heatsink, took a pic, replaced the grease with AS5, screwed it back in.
The voltage on the said chip did not rise immediately to the intended level of 0.65V because the thermal gap did not close.
 Then I applied epoxy adhesive and put pressure of the heatsink until the epoxy cured. It closed the thermal gap and the chip worked fine at 0.65V. Just like it did before the heatsink was removed. What I can say is that most likely AS5 has equal thermal conductivity compared to the OEM grease. 8X thermal conductivity does not imply that temps will be reduced by 8X.
 (Final temps also depends on the temperature differential between chip and heatsink). I think it means that AS5 will conduct 8X the amount of heat than MG paste.

Some scientist you are...you should know that gravity is a constant  ...want an apple to race with?

Back to topic...what were your results from before and after with your "8x as conductive as MG grease" AS5 ...I am very curious to know your results as you actually went through all the trouble to remove 1 whole heatsink assembly...soooo what were the results from using your super duper AS5...was it 8x cooler? any numbers at all from your clearly extensive testing to back anything up or just another lame signature spam campaign hmmmm Im done ...thanks for the laugh

Not before you leap down that cliff and let us know the gravitation acceleration that was measured.  

systematic knowledge of the physical or material world gained through observation and experimentation. 
(What do you think systematic knowledge is buddy?)
Have you ever heard of experimental errors; nothing that one measures is totally accurate, there is a probability associated with every scientific observation.

we must have gone to different schools

science    
1.
a branch of knowledge or study dealing with a body of facts or truths systematically arranged and showing the operation of general laws:
the mathematical sciences.
2.
systematic knowledge of the physical or material world gained through observation and experimentation.
3.
any of the branches of natural or physical science.
4.
systematized knowledge in general.
5.
knowledge, as of facts or principles; knowledge gained by systematic study.
6.
a particular branch of knowledge.
7.
skill, especially reflecting a precise application of facts or principles; proficiency.

I guess your science is...if you cant convince them with facts, then baffle them with bullshit? Of course PRICE and composition have no bearing on anything...lets buy 150G worth of AS5 and re-do all our miners...NOT
Science..the art of bullshit?

Im still waiting for you to re-paste the other 7 chips on your SP20 and post the before and after results Mr Scientist

Science is the art of Likelyhood.

Well the start voltage is a good observation. It's possible that OP did not apply the epoxy adhesive to close the thermal gap between the chip, copper plate and the heatsink.

Thanks for introducing another irrelevant angle, one that of price. Lets compare their thermal conductivity. I think thermal conductivity of AS5 is ~8X that of MG grease.

The board schematics are not necessary since I am NOT pasting up the whole board, just the die.

Again here you go with your science of LIKELY which is by no means evidence lol
as you can see from his post his start volts are .67 which is much higher than the ones doing .5x hmmmm wonder why they aren't getting the proper volts...you should know that the start volts are within .005 of the setting in the gui... could there be a short somewhere  
He could have also damaged the boards taking the heatsinks off...so many variables but back on topic AS5 is not really the best choice to use based on price and composition

Arctic Silver 5 3.5G tube is $10
MG Chemicals non-conductive grease which gives the same result is $15 for 150g and how many grams does it take to re-do an entire machine hmmmm....

I am trying to make sense of evidence provided without being overtly opinionated. It's your ego that is getting bruised without a specific reason.
I donot see a plausible explanation as how AS5 can screw a SP20.

Now you are just talking shit.
u took 1 heatsink off and reapplied grease to it and call it safe without having the board schematics...try doing what the OP did and post your results ...have you re and re an entire machine to base your results on? I have... and the OP has fucked up his machine as you can clearly see from his results so please put your ego aside...or paste up an entire SP20 with AS5 and post your results like the OP

SAFE advice could be just an opinion without proper scientific evidence backing it up.  

The evidence points that the voltage for some chips are not at their desired levels. It is more likely that it's a SP20 voltage configuration settings or a  power supply issue.

0: DC2DC/1/:[vlt1:625 vlt2:629(DCl:794 Tl:629 Ul:688) 54W  87A  73c] ASIC:[110c (125c) 720hz(BL: 720)   91 (E:193) F:0 L:0]
 1: DC2DC/1/:[vlt1:572 vlt2:576(DCl:794 Tl:576 Ul:688) 32W  56A  75c] ASIC:[ 85c (125c) 490hz(BL: 490)   76 (E:193) F:0 L:0]
LOOP[1] ON TO:0 (w:139)
 2: DC2DC/1/:[vlt1:562 vlt2:565(DCl:794 Tl:565 Ul:688) 26W  47A  66c] ASIC:[ 85c (125c) 440hz(BL: 440)   58 (E:193) F:0 L:0]
 3: DC2DC/1/:[vlt1:603 vlt2:608(DCl:794 Tl:608 Ul:688) 34W  57A  61c] ASIC:[ 85c (125c) 490hz(BL: 490)   81 (E:191) F:0 L:0]
LOOP[2] ON TO:0 (w:226)
 4: DC2DC/1/:[vlt1:666 vlt2:672(DCl:794 Tl:672 Ul:688) 80W 119A  88c] ASIC:[120c (125c) 900hz(BL: 900)  116 (E:193) F:0 L:0]
 5: DC2DC/1/:[vlt1:625 vlt2:629(DCl:794 Tl:629 Ul:688) 59W  94A  90c] ASIC:[115c (125c) 770hz(BL: 770)  110 (E:193) F:0 L:0]
LOOP[3] ON TO:0 (w:195)
 6: DC2DC/1/:[vlt1:587 vlt2:592(DCl:794 Tl:592 Ul:688) 32W  55A  73c] ASIC:[100c (125c) 480hz(BL: 480)   94 (E:193) F:0 L:0]
 7: DC2DC/1/:[vlt1:646 vlt2:650(DCl:794 Tl:650 Ul:688) 66W 102A  76c] ASIC:[ 85c (125c) 820hz(BL: 820)  101 (E:192) F:0 L:0]

as scientific as "likely" ....cheers  
If we are to be scientists we should perhaps quote guy who said that epoxy is not necessary to re-secure the heatsinks as the glue was there to hold them in place during shipping but I digress...just trying to give SAFE advice to someone who clearly has no idea what they are doing (OP)

Nice scientific opinion here. thanks!

I just pulled that warning from the AS5 site...I don't know what the hype is all about with that anyways there are much better thermal compounds out now and cheaper than silver as well
I still don't think its a good idea to use AS5 on top of the ASIC, that could likely be the reason why they have other compounds which are not capacitive ...likely and maybe are just guessing that it wont screw anything up and better safe than sorry I always say...that warning is there for a reason, keeping in mind that not everyone knows how to even apply grease we could assume its likely though  

Ofcourse a thermal compound is thermally conductive, it's apparent in the definition.

Second holds true for almost all thermal compounds. Likely SP20  does not have high speed (GHz) data buses on the PCB, where a drop of AS5 can close the eye.

Not Electrically Conductive:
Arctic Silver 5 was formulated to conduct heat, not electricity.
(While much safer than electrically conductive silver and copper greases, Arctic Silver 5 should be kept away from electrical traces, pins, and leads. While it is not electrically conductive, the compound is very slightly capacitive and could potentially cause problems if it bridges two close-proximity electrical paths.)

Here is what it should look like after:


This is the mess that was before:

I repasted one of the chips, because I had pried open the heatsink to take a picture.
Arctic Silver 5 is not a conductive thermal compound so you are good.

 But I wonder how did you stick the heatsink back? Since a good amount of pressure and a strong epoxy is needed to make sure thermal conductivity is restored between the chip, the copper plate and the aluminum heatsink.

For starters, you should NOT have used anything with SILVER near ASIC and I think that is half of the problem...I also noticed that you are not running it in the enclosure it came in
You should only have a very small amount of grease on the top of the chip and nothing anywhere else...I see in the data you posted that the volts are very low on 3 of the chips

Use another form of thermal compound without metal in it like MX-4.
Keep in mind that due to the half-assed grease job there may be leftover grease in places it was never meant to be...at least on my miners it was everywhere..the sides of the heatsinks, between the chips, everywhere...very messy and the dust loves to stick to that grease too...
I used MG chemicals non conductive grease as it calls for quite a bit of it if you remove the grease between the copper shim and the aluminum during the process.
I re-did a couple of machines which were throttling at .62v prior to pasting and they run a lot better now...I have pics somewhere of the process will upload when I can..the original job was horrible 

Are these the same settings you had prior to re-pasting and you were getting around 1400GH/s before this?
Also since you are undervolting there is no reason to have such a spread from .67 start to .69 max unless you are in a hot location..if that is the case just drop the max voltage to .68
In the field "restart miner if rate below" ... what do you have in that field, and why do you have 272w for the max watts on all 4 loops when the realistic value you should have for that voltage is more like 230w per loop

Why did you take the boards out of the original case BTW...there is a reason the airflow is over the boards in the way they are laid out..you may be cooling the top of the board ok but the back with all the power components needs cooling as well
You have 22 hardware errors in half an hour...u definitely did something wrong in the process...did u get rid of the glue that was holding the heatsinks down? possibly damaging something in the process?