Topic: GridSeed 5-chip USB miner voltage mod - page 61. (Read 156988 times)

Why do people pretty much LOVE artic silver 5? That is conductive but dissipate heat better? Thanks.

Also, I'm about to get a 1/8W %1 resistor.

http://www.digikey.ca/product-search/en?pv1=1062&FV=fff40001%2Cfff800e9%2Cc0001%2C400004&k=resisotr&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

thats the list, and I'm getting this one

http://www.digikey.ca/product-detail/en/CRCW040247K0FKEDHP/541-47.0KYCT-ND/2223047

Would this work. I've used resistors before but I never really cared much about the 1/4W or 1/8W (EE is just a hobby lol)

I am also pretty sure that your board will just burn or just turn off.



Like reggie0 said, only try to go lower.
With an 47kOhm 1%(the one percentage is important) and some thermal paste(non conductive only) i am pretty sure that you get stable 1150mhz on all devices.

With this mod, 7w only mode is using close to 40w? I'd guess that if you try running SHA256 Mode, might as well just toss it in the trash. 

Anyone check to see what affect this mod does to SHA mining?

You can use, but you will have extra power consumption and heat dissipation. Always use the smallest sufficient resistor(voltage) to achieve the highest efficiency at a selected frequency.

That blog is a joke. Even if it was "jamie", they didn't even cite her.

Also, Everyone is saying to use a 47kOhm resistor. Can I use a 56kOhm at 1100mhz? Does it need to be 1/4W or 1/8W? I mean, I know I can increase the mhz but will it be good at 1100mhz?

Thanks nemercry!

Oh man that blogs.
Copy pasted nearly the whole thread ,without naming anyone who helped developing it.
http://cryptomining-blog.com/1839-another-new-voltmod-update-for-the-gridseed-5-chip-btcltc-asic-miners/#comment-759

has anyone measured power draw with latest mod,
R52 resistor = 47k, but only 950 Mhz clock?

much higher than 1,25V bridge-mod on 400 kH?

Seen it, but other than the size of it it's the same as buying single gridseeds.

So you might be better of when you buy some miners off Ebay for a better price for example

Some news popping up for you guys...

https://bitcointalk.org/index.php?topic=554551.new#new

First thing i do with ALL my miner grid and bitcoin is to apply thernal grease  onto the hearsink. With the grid i also applied thrrmal pads ob top of the grease . Same surface area as the orignal pads but better quality just to be safe so the heatsink didnt csuse a short anywhere. Some for the componets are awfully close to the heatsink fudnt want to risk a short. I noticed thst when i applied the thrrmal grease to the gridseed chips thrrmsl via there was solder sticking out of so e of the vias. So i also reheated each chip and applied firm finger pressure - use gloves the chips are still very warm - just to make sure the contact was good. Then plenty of grease. As it gets warm/hit itll follow into the yhetmal vias. Thermal frease artic mx4.  Dont forget to cleanthe surface area before hand to remove any girgein grease etc - srtic thrtmsl removal us good to use

Thanks, Panda...

I will do this first too...when my next 20 Gridseeds get delivered...

Very nice. I will do this first, before attempting any over-volting

Thank you, buddy...Hope it's helpful for the mining community here...

Sorry for no pics...but my camera is broken...Need a new...and better one...

Very nice post,

next time make some pictures of the procedure so that the Noobs among us can also see the result in Image.

Like they say a picture is worth a thousand words

Speaking of HEAT...

I would like to address maybe a little overlooked so far details of the "overclocking quest":

THERMALS and COOLING...!

As a veteran "overclocker" (since the "glory" times of AMD/Intel 486-33 to 50/66 and Celerons) I believe that the proper cooling is very critical for successful overclocking. Looking at the current Gridseed cooling using so called "thermo pads" - full on the bottom, central for Gridseed chips only on the top, I was just wondering how a "quick and dirty" design decision this could be ?... Because it is BAD...so bad that fully deserve the term "afroChinese engineering"...

Why...because there are so MANY air pockets between the chips (and other components to be cooled) and the Heatsink surfaces...mainly on the bottom...5 GOLDEN pads of the chips, with numerous vias, etc.. that there is NO WAY to make a full contact with the thermo pad first, and second - the heatsink on the other side...

Avalon/Gridseed saved time or money on a very simple thing...THERMAL PASTE (grease)...!?!

So yesterday I reach for my tube of thermal paste(TP):

1. Apply a small drop of TP on each of the 5 "golden" pads on the back...spread evenly to cover all visible surface of the pad(s) and fill the small holes (vias)...don't make it thick...just thin as possible is good enough...I used the flat tip of the small screwdriver...
2. Apply a small "X" on the central metal surface of the bottom heatsink...and again spread in a very thin but even layer of TP towards the edge of the circular heatsink surface ...
3. Reassembly carefully back...center properly...tightening the metal studs just good enough...I used the force
of my fingers...DON'T FORCE - you could damage the main board with tiny electrical traces inside...
4. Same procedures apply for the top part of the chips and heatsink...

The final effect of this "mod' is ...Gridseed chips are running at LEAST 15-20 degrees C cooler...

I am following this tread very carefully and experimenting with different mods myself for the last week or so...notice that my test chips are running "burning" hot when over 1000+ MHz...I can not keep my finger for more than 1-2 sec...which is probably like 65-70 C...So I installed a cooper RAM heatsinks to prevent from burning without the top  heatsink during the tests...Still I could not keep my fingers any longer...

After the TP application they are just WARM to the touch...which probably about 45-50 C...

But the MAIN RESULT is - NO HARDWARE ERRORS for the last 24 hours run in the range of 1000-1025-1050MHz with 1.45-1.46V only for the Gridseeds...not even a single HW one...!

IMHO, I think that also could explain the "unstable" (I call them "slackers") chips in the same Gridseed device...performance differences, etc...

As usual...if you are not sure that you could follow these mods...don't do it...or do it at your own risk !

Many thanks for all the contributors of this tread ...and good luck !
  
ZiG


EDIT :

VERY IMPORTANT...!!!

The thermal paste HAS to be NON-CONDUCTIVE !!!...NO "Arctic Silver 5" or similar with metal (Aluminum) particles content...

ZiG

you mean the one i said WAY back. swap outy the reizsitor that corresponds to vid0 and vid1 being open. im still wainting on parts otherwise id have donw weeks ago.

Wow I just ordered 3 gridseeds and stumbled upon this thread I hope I can find someone near me who can mod them for me :-D

which mod are you still running them without fans?

perhaps make the mod and run them 850/875 clock during the summer and then run them 1100 in a cold garage during the winter?

of course alternative cooling is another option to cool 10 or 20 with less watts than a fan on each as well but then making up the price for said alternative cooling would smack ROI (cool designing it though)

What is the heat like with the 47kohm SMD resistor? Does double the power = double the heat?