MinerEU.com 850USD THunderX3 80 USD Blizzard , 4*Blizzard @ 60 USD each

[JoostB]

920W power use though.

920W is wishful thinking, in practice it is more like 1150W.
I know some people with a GAW Falcon, and that is what they measure on average.

I know someone that has the 22 Mh/s versions runnign tha were supposed to run at 800watts and they are running at 760.... That someone is me btw...

The Falcon has 33% more chips, the power usage is also 33% higher, > 1KW.

[james42]

Yes the $2500 with $200 shipping, and $540 VAT (same across most of Europe) turns into $3240 quite quickly. I know that when it arrives in UK DHL or whoever will add on a £50 handling charge if not more. So lets say a landed in hand price of $3300. Power here costs me £0.13 a Kwh, so if it is using 1150w that'll be about $550 over 90 days. So all in all it'll be $3850 for 90 days.

The A2 using half the power comes slightly more expensive at $4125 over 90 days - but my current A2 is hashing at 30.44Mh/s stable.

So

A2 = $135 Mh/s
Zeus = $137.5 Mh/s

A2 is cheaper :-)

[JoostB]

Yes the $2500 with $200 shipping, and $540 VAT (same across most of Europe) turns into $3240 quite quickly. I know that when it arrives in UK DHL or whoever will add on a £50 handling charge if not more. So lets say a landed in hand price of $3300. Power here costs me £0.13 a Kwh, so if it is using 1150w that'll be about $550 over 90 days. So all in all it'll be $3850 for 90 days.

The A2 using half the power comes slightly more expensive at $4125 over 90 days - but my current A2 is hashing at 30.44Mh/s stable.

So

A2 = $135 Mh/s
Zeus = $137.5 Mh/s

A2 is cheaper :-)

That is exactly what I mean, over here the power costs even more (€0,22 per KW/h).
And you have to buy an additional 1200W power supply for the Zeus, that adds at least another €175,-

My A2 uses ~350W, that's about 1/3th of the Zeus miner.

[james42]

And MinerEU may not be very good at communication but the product at least does what it says on the tin. Power of course is higher. I have my 30g of Artic M2 now, so will be improving the cooling further tomorrow

[JoostB]

And MinerEU may not be very good at communication but the product at least does what it says on the tin. Power of course is higher. I have my 30g of Artic M2 now, so will be improving the cooling further tomorrow

Haha, allright yesterday I also got mine, a nice syringe 30g. 8 years durability!
I'm still a bit hesitant to disassemble the blades though.

[james42]

Not a problem. On the bottom of the case you will see 6 screws for each blade. Two per blade are in a keyhole, just loosen those and remove the other four.

Inside the case pull out the power and data connectors from the blade, if there is hot glue on the connectors just pull it off. Unscrew the small heatsink first, then unscrew the large one. Once unscrewed they are loose, not bonded or anything :-)

[emdje]

Let us know how much it improves. My fans will arrive in a couple of days and I will build a custom casing for it 

[JoostB]

Not a problem. On the bottom of the case you will see 6 screws for each blade. Two per blade are in a keyhole, just loosen those and remove the other four.

Inside the case pull out the power and data connectors from the blade, if there is hot glue on the connectors just pull it off. Unscrew the small heatsink first, then unscrew the large one. Once unscrewed they are loose, not bonded or anything :-)

Yes, I already saw how it is assembled. I have to be careful with static discharges, 28nm chips are very sensitive.
Also unclear is how much mechanical pressure you can put on the chips when reassembling without cracking them.
The Chinese like to use thermal glue everywhere, after heating it with a fohn it will peel off easily.

I can see that there is a thermal pad between the top heat sink and the chips.
I assume there is no pad between the PCB and the bottom heat sink? At least I don't see it.
Are all these big copper pads on the bottom of the PCB ground pads?

Edit: I looked more closely and see now that there is also a thermal pad on the bottom.
  
Maybe a good idea to put some MX-2 underneath the copper pads of the voltage regulators as well.  

[james42]

Yes ground pads everywhere under the big heatsink. There is a thermal pad on both sides.

A good custom housing would just be a tunnel with one blade and a fan at one end.

[JoostB]

Yes ground pads everywhere under the big heatsink. There is a thermal pad on both sides.

A good custom housing would just be a tunnel with one blade and a fan at one end.

If they are all ground pads a thermal pad on the bottom may not be needed, but I assume they wouldn't put it there if it isn't necessary.

[james42]

They are all copper. According to the spec sheet 70% of the heat comes out of the bottom of the chip and into these copper plates.

I'm going to leave the pad on put just add some MX2 to both sides

[JoostB]

Just looking with my IR thermometer at the voltage regulators and there is a big difference between the temperatures.
The PCB is very thin, it bends easily, and it looks like not all of them make good thermal contact.

Tomorrow morning I will try to improve the cooling, now I'm too tired, went up 6 o'clock this morning.

[emdje]

I downloaded the image that was posted here by MinerEU but I do not see the temperatures and the cores.

Downloaded the one from https://github.com/MinerEU/scripta_a2
and then it linked to chrome://mega/content/secure.html#!t91g2BRK!qW2P1EeVZ_1M8QTHPjuEQWAgq-nK3Tlfgskl9itAo7A

Now I am going to try the dropbox link image that was shared here.

Ow and I can't find this file called /var/www/run.sh to change the frequencies.

thnx

[JoostB]

I downloaded the image that was posted here by MinerEU but I do not see the temperatures and the cores.

Downloaded the one from https://github.com/MinerEU/scripta_a2
and then it linked to chrome://mega/content/secure.html#!t91g2BRK!qW2P1EeVZ_1M8QTHPjuEQWAgq-nK3Tlfgskl9itAo7A

Now I am going to try the dropbox link image that was shared here.

Ow and I can't find this file called /var/www/run.sh to change the frequencies.

thnx

I never tried the MinerEU image, in the Innosilicon image /var/www/run.sh should be there.
You don't have to change the frequencies by modifying run.sh, in the original image you can do it from the UI.

[james42]

In the minereu image you should just be able to change the frequencies on the settings page of the web interface

[JoostB]

I'm thinking about modifying the Gridseed CPUMiner for use with the A2 miner.
Unfortunately there is no driver source available, I wonder whether the driver for the A1 chip is compatible with the A2.
I have a strong feeling that the interface for both the A1 and A2 chips is exactly the same.

[james42]

I took a quick look at that. IIRC from the original Innosilicon literature it said the workflow and even the circuit board design was the same as the A1. Maybe it's worth compiling with A1 support and seeing what happens

[james42]

Well I ordered a second one today. Wonder when it will arrive

[JoostB]

Well I ordered a second one today. Wonder when it will arrive

Yesterday I almost ordered one.
The difficulty is going up faster than expected, I'm still in doubt.
Also sold all my BC last week, I'm waiting for a good moment to buy back in.
Maybe I just have to take the plunge.

[JoostB]

How much BTC they ask for it at the moment? I expect something like 6.2.
Stupid that you can't see this before you place your order.