|
Bitmain has been declaring their miners at the purchase price for quite some time now.
If for some unknown reason customs charge more than the percentage for VAT based on the purchase price, you can get that additional money back.
However, do not forget that the carrier ie UPS charges around 10€ for the customs service on top.
|
|
|
|
just had a call from UPS.
Apparently of the 2 invoices bitmain supply they give 2 different values. 935 usd and 975 usd. they wanted to know which one I actually paid?
Tell them 935.... duh It should be accurate after the 7% discount. |
|
|
|
|
I have seen 480 GH, so that should be possible.
What would really be interesting is if somebody could measure the DCDC temperature at full load. We can then see whether it is limitated by temperature or other problems.
|
|
|
|
Not sure you would want to, but looks easy to swap out the fans for better ones (if these ones are poor quality)
It is easy, I did it with some Ant S1, but I mostly just installed a 2nd fan at the end to improve cooling. As this one already comes with 2 fans, there isn´t really too much reason to swap fans. Sure, these are server grade fans, but they work really well at moving lots of air. Maybe you could reduce noise by 20% by changing too some brand fans, but noise on the S3 is already quite low. |
|
|
|
|
Bitmain has 24/7 assembly as long as parts are ready.
What they cannot control (too much) is how ups schedules their pickups and plane flights.
|
|
|
|
If the fans are 140mm it would be a bit less noisy at the same cfm  Antminers were never noisy though, and work quite well even at high ambient temperatures. |
|
|
|
|
@Juan
Is that on stock speed or with overclocking?
Did you try overclocking?
|
|
|
|
How about Big-ass Bitcoin  Hardcore Hashing? Maximum Mining? Turnkey Technologies? That way you have your alliteration and a memorable name  |
|
|
|
Tracking number received for my Batch 1 order.
I was able to get confirmation from BitMain via email, that the S3's will be 441GH/s baseline for their entire production run.
That´s a bummer. They better figure out the S4 quickly then, as 0.8W/GH wont last too long in this fast-paced environment. |
|
|
|
Get a hot air extractor at the one side and a fan to push air in at the other. Just look at some growshop websites to get the idea, they have everything on hand needed for ventilating hot rooms . |
|
|
|
|
The chips DO NOT NEED to be that "cold".
If you calculate the cost of using 20-30% additional electricity and the cost of buying an AC, you will quickly discover that it is just not worth it for a small possible 5% performance increase.
You either already have very low ambient temperatures and can either settle with lower airflow or increased airflow and better performance, or you dont.
It is not economically viable to cool the air down in your mining room, if you can have enough airflow.
|
|
|
|
Yes, the quoted values are only valid for "cooling" your "Datacenter" room and the temperature difference is between intake and output temperature of the units (which is all that matters in this setting).
What do you mean it's all that matters in this setting? You could have a shitty heatsink or even no heatsink at all and still manage an in/out air dT of 11C with 150cfm. (assuming the chips don't explode at 500C) It is all that matters because you are only calculating the needed airflow for your mining room, not the unit. Those calculations are done by the engineers designing the unit and therefore irrelevant for the average miner. Spondoolies have done those and designed the unit accordingly. |
|
|
|
ups tracking
"A valid tax ID or deferment number is missing and is required for clearance. We are working to obtain this information. / Your package is at the clearing agency awaiting further release."
wtf???
They assume you are a commercial entity and think you might not want to pay VAT. Call them up and tell them it is a private order. |
|
|
|
|
Yes, the quoted values are only valid for "cooling" your "Datacenter" room and the temperature difference is between intake and output temperature of the units (which is all that matters in this setting).
Calculating the needed airflow for individual miners is much more complicated as you also have to take into account heatsink area aswell as various other factors.
It is also the responsibility of the engineers designing the miners and cannot be influenced (too much) by the customers.
|
|
|
|
|
The surcharge from UPS for handling customs aswell as lending your money so you can pay it with the UPS driver.
Really, you are paying for 900$ in mining gear and are complaining about a ~1% charge from UPS?
|
|
|
|
|
VAT is roughly £107 for both S3s.
This might not include the surcharge from UPS which should be around £10.
|
|
|
|
|
The sp30 should be less sensitive to higher temperatures due to the following reasons:
- 400cfm maximum airflow aka ~45% higher airflow per kW
- lower leakage increase on 28nm vs 40nm at higher chip temperatures
- roughly the same heatsink surface area per kW than sp10
As to the cooling questions, it is roughly q=wCpΔt which means:
→ 157 CFM are required to cool 1 kW, if the ΔT through IT equipment is 20°F (11°C)
→ 125 CFM are required to cool 1 kW, if the ΔT through IT equipment is 25°F (14°C)
→ 105 CFM are required to cool 1 kW, if the ΔT through IT equipment is 30°F (16,5°C)
So temperature is equally important than airflow, however increasing airflow is obviously much easier (and therefore cheaper) than lowering the temperature.
|
|
|
|
Track by reference does actually work! thanks for the info |
|
|
|
|
Show Posts
