Klondike heatsink sourcing

[evilscoop]

pm sent...

Ill be looking for around 100-200 too

[sensei]

What are we looking at for pricing on these?

[marto74]

The price for 200 pcs batch is 3.90 EUR
In 1000 pcs I can probably fit in 3.650 EUR

[KS]

The price for 200 pcs batch is 3.90 EUR
In 1000 pcs I can probably fit in 3.650 EUR

VAT?

[marto74]

excluded

[bizwoo]

The price for 200 pcs batch is 3.90 EUR
In 1000 pcs I can probably fit in 3.650 EUR

Nice job.

[KS]

excluded

 

[Bicknellski]

Might be good to consolidate all our various extra Klondike threads to one.

1. Casings
2. Controllers
3. PSUs and cabling
4. Firmware  / Mining Software
5. Miscellaneous
6. DIY Build information
7. Pricing and sourcing of PCB, BOM, etc.
8. Heat sinks and cooling

[KS]

subforum 

[Bicknellski]

subforum 

Beg and u still no receive subforum!

[evilscoop]

excluded

 

you and your vat....tsk

[steamboat]

The price for 200 pcs batch is 3.90 EUR
In 1000 pcs I can probably fit in 3.650 EUR

Glad the recess design worked out for you. I'll keep it in mind.

[marto74]

The price for 200 pcs batch is 3.90 EUR
In 1000 pcs I can probably fit in 3.650 EUR

Glad the recess design worked out for you. I'll keep it in mind.

Yes .
We are going to output 2 versions:
1. With M3 thread on the 55x62 and recess
2. With trough hole 4mm dia and 8 mm dia blind for spring type clamping , with cutout for PCI-e pins

[KS]

excluded

 

you and your vat....tsk

Wot?

I was kinda hoping for a 20% price reduction. A man can dream!

[Vigil]

This is my first attempt at a simplified model of the K16 I've made using only the Avalon chips. I have them generating 2W each. They are modeled as QFN chips with most of the details and majority of the dimensions correct. I have modeled the lands that go through the board but they may not be meshing correctly so I will continue to look at that. I can add other chips and more detail if I can get the measurements and power output. The more exact I make the model, the more realistic the results will be.

This model uses an aluminum heat-sink which covers the entire bottom surface, the fins and base are 2mm thick - it is based off the heat-sink posted about 20 pages ago. I can alter this to any type of design: change fin size and number, change to fingers, etc. Additionally, this model is cooling only from the heat-sink, i.e., there are no fans or any air movement except that from buoyant convection. It is actually a transient scenario but here I am only using a steady-state model, but I can look at transient.

The temps seem a little high to me, 148 C (300 F), but of course this is without any air movement. However, many GPUs can get to 120 C or more if heat-sinks aren't attached or no air. This was just a first shot and I am going try some other things and recheck this solution, etc.


Avalon chips wire-frame.


Simplified board model with heat-sink.


Heat-transfer analysis showing temps of chips with no forced convective flow air exchange. Temps of chips reach approx. 150 C while operating at 2W with this heat-sink.

[Vigil]

I have since run another model which is based directly from "Heat sink #4" posted by Bicknellski. The initial design above was based on it but I did not have the length of the fins correct. This model changes the overall height from 10mm to 32 mm. There is no airflow, just standing air with the heat-sink portion facing "up" so that the heat can rise away from the board and not get trapped. I accidentally took the picture rotated incorrectly, so please take that into account. The heat is rising not falling. Extending the fins has drastically improved the temperature, reducing it from 150C to 78C.


Heatsink #4 - Length 100.00 mm, Width 97.00 mm, Height 32.00 mm, Thickness taken to be 2mm.


Extending the fins by about 20 mm has reduced the temperature to 78C, approximately a 50% reduction in temperature. (Note: picture was taken upside down - I will update).

[Bicknellski]

The fins are slightly serrated as well or ribbed and there are two raised channels for holding fans or mounting, two fins in on either side.

But that is an amazing result. What is the heat compound simulated in the model?

Also the thermal vias will be filled with an epoxy, I think???, to prevent solder wicking... also the base of the heat sink is 5mm that is pictured pretty sure.

[Lollaskates]

Vigil, are you taking orders for your heatsink when you've perfected it to your liking? If not, could you recommend the best place in the US to get them manufactured? I'm looking for 16.

[Bicknellski]

Vigil, are you taking orders for your heatsink when you've perfected it to your liking? If not, could you recommend the best place in the US to get them manufactured? I'm looking for 16.

Note to everyone...

You are best to find a fabrication / extruder site near you. Shipping even 1 of these heat sinks any distance doubles the cost. Find something local. In terms of design you need to develop that. I am hoping we will have something recommended and posted by BKKCoins once he is testing that phase in the GitHub. Start sourcing a local fabricator NOW!

I sent 4 heat sinks of various sizes to BKKCoins and others have also sent heat sinks. Marto sent his heat sink with the holes drilled and notch cut out etc... so follow along in the BKKCOins thread at some point in about 2 weeks we will probably see a heat sink posted there. FANS are needed as passive cooling will likely be a too much especially for those with higher ambient temps.

[Bicknellski]

I am currently trying to get prices for heat sinks locally (Tangerang) and in Jakarta. These links will be helpful for those in Indonesia.

www.superexagraha.com/

www.aluminiumextrusionsatria.com/

www.katalogalumunium.com/consumer-application/AlumuniumHeat%20Sink.html

www.alumas.co.id/product.html

www.pt-alexindo.com/product-range.html

www.alkomandiri.com/about_profile.html