Topic: [GAUGING INTEREST] H-Card Mini Group fab (Read 7984 times)
BFY 0bg thru 0bm are the 7 chip board
Any news Taugeran?
I've got a 7 chip board up and working sub optimally, using a lower Vcore of 0.754V but producing terribly high error rates will post a pic in a few
Any news Taugeran?
Could be i didnt give BFG alot of time to stabilise.
But there is some odd behaviour with R2 chips, R1 chips would go from 30W or so to about 10W when you turn BFG off but R2 chips would go from 30W to just 20...25, i dont think BFG knows to shut down all the cores.
Chainminer doesnt even turn them off.
But there is some odd behaviour with R2 chips, R1 chips would go from 30W or so to about 10W when you turn BFG off but R2 chips would go from 30W to just 20...25, i dont think BFG knows to shut down all the cores.
Chainminer doesnt even turn them off.
From experimenting and a Voltcraft 3000 power logger
R1 chips do 27~31W at the wall with a 3.9k resitor(12 chips/board) 29~32 gh/s
R2 chips do 29~31W at the wall with a 3.9k resitor(12 chips/board) 29~30 gh/s
Just my 2 cents
R1 chips do 27~31W at the wall with a 3.9k resitor(12 chips/board) 29~32 gh/s
R2 chips do 29~31W at the wall with a 3.9k resitor(12 chips/board) 29~30 gh/s
Just my 2 cents
that can't be correct - by all accounts the R2 chips are presumably about 15% more efficient, so i thought you would see more like 32-35GH
From experimenting and a Voltcraft 3000 power logger
R1 chips do 32~37W at the wall with a 5.6k resitor(12 chips/board) 30~35 gh/s
R1 chips do 27~31W at the wall with a 3.9k resitor(12 chips/board) 29~32 gh/s
R2 chips do 29~31W at the wall with a 3.9k resitor(12 chips/board) 29~30 gh/s
R2 chips do 39~47W at the wall with a 3.9k resitor(16 chips/board) 37~40 gh/s - never kept i going as it will damage the powerbuck
R2 chips do 30~35W at the wall with a 2.7k resitor(16 chips/board) 32~35 gh/s - current setup
Just my 2 cents
R1 chips do 32~37W at the wall with a 5.6k resitor(12 chips/board) 30~35 gh/s
R1 chips do 27~31W at the wall with a 3.9k resitor(12 chips/board) 29~32 gh/s
R2 chips do 29~31W at the wall with a 3.9k resitor(12 chips/board) 29~30 gh/s
R2 chips do 39~47W at the wall with a 3.9k resitor(16 chips/board) 37~40 gh/s - never kept i going as it will damage the powerbuck
R2 chips do 30~35W at the wall with a 2.7k resitor(16 chips/board) 32~35 gh/s - current setup
Just my 2 cents
Any news?
I figured it would help settle some nerves to see working product, so a minuscule prototype board order was placed yesterday. Eta on boards is ~may 14.
Most likely no major news in that time frame
Cool. Thanks!
Any news?
I figured it would help settle some nerves to see working product, so a minuscule prototype board order was placed yesterday. Eta on boards is ~may 14.
Most likely no major news in that time frame
Any news?
Taugeran,
I'm very interested. Sent you a PM about maybe doing a full vacuum pack production run.
H@shKraker
I'm very interested. Sent you a PM about maybe doing a full vacuum pack production run.
H@shKraker
I can get you a quote for pcb and assembly from a US (South FL) facility. We already quoted someone from my first group buy for these, but he just needed a few and the price breaks are at 100-500-1000 units.
I also have 600-800 R2 chips and 100 R1 chips if anyone will be be needing them for this. They will likely be the last bitfury chips that I get, and there are some NF6 group buys that may be needing them, first come first served. You can still buy them from bitfurystrikes back but they have higher prices for smaller quantities, and you are limited to 32 chips for small orders of less than a tray.
I also have 600-800 R2 chips and 100 R1 chips if anyone will be be needing them for this. They will likely be the last bitfury chips that I get, and there are some NF6 group buys that may be needing them, first come first served. You can still buy them from bitfurystrikes back but they have higher prices for smaller quantities, and you are limited to 32 chips for small orders of less than a tray.
I don't quite understand why 16 chips won't reach 50GH/s. How is this not scalable?
If you double the powersupply and use active cooler too get rid of the heat you could reach 50GH/s right?
If you double the powersupply and use active cooler too get rid of the heat you could reach 50GH/s right?
My experience with The rev1 chips on v1.2 H-boards was that with a good board you could get up to 25-30GH/s stock.
With a small pencil mod AND either decent airflow OR heatsinks 30-34GH/s was achievable.
With a moderate pencil mod AND decent airflow AND some heatsinks on the backside 35-38GH was achievable.
With all the above plus a bit of luck, or some very dedicated tuning, 38-42GH was achievable. At this stage the VRM is about 150% its maximum amperage specs but could handle it.
The rev2 chips are about 15% more powerful at the same wattage presumably.
I recently had a 38GH board (3rd slot) stop hashing and fail to show up in .stat.log. my assumption is that either the TPS53355 burnt out or the inductor burnt out. Haven't made much headway on the diagnostic process
I don't quite understand why 16 chips won't reach 50GH/s. How is this not scalable?
If you double the powersupply and use active cooler too get rid of the heat you could reach 50GH/s right?
yes doubling the power supply to 60A would allow 16 chips to achieve 50 Gh. But TI doesn't have a pin compatible regulator capable of 60A to replace the TPS53355 If you double the powersupply and use active cooler too get rid of the heat you could reach 50GH/s right?
I would be interested in a few. I just had two h-cards die on one of my rigs, and it looks like another card is hashing ridiculously poorly on a different rig so it's probably going to kick the bucket soon. I just hope that they will hash roughly equivalent to the 16 chip cards. I'd be happy with 25 GH. The thing is, they'd have to be pretty cheap to justify reinvesting in bitfury hardware rather than just saying screw it and go buy a bitmain or A1 based product.
I've come to the conclusion that v1.2 cards are just too poorly built to run 24/7.
I've come to the conclusion that v1.2 cards are just too poorly built to run 24/7.
If I might inquire how were the chips on the two dead cards doing before communication death?
To be honest I'm not sure as I was not monitoring them actively before. But I do remember them hashing at around 25 GH or so. Another card died just the same. I ended up giving the card away to some dude in the UK. He found out that "16 Capacitor mising and 1or 2 Resistor blowup." I hope you use robust resistors and caps.
I don't quite understand why 16 chips won't reach 50GH/s. How is this not scalable?
If you double the powersupply and use active cooler too get rid of the heat you could reach 50GH/s right?
If you double the powersupply and use active cooler too get rid of the heat you could reach 50GH/s right?
After some back and forth last night with the very enlightening vs3 has given me some insigh and ideas on how the BOM can be lowered further. Though this will require maybe 1-2 evenings reworking capacitor pads and quantities.
Summary:
Since these cards are based off one of the first production designs which itself was heavily over-engineered particularly the decoupling capacitor arrays around each chip and the groups of 8 through out Vcore power plane
Summary:
Since these cards are based off one of the first production designs which itself was heavily over-engineered particularly the decoupling capacitor arrays around each chip and the groups of 8 through out Vcore power plane
The better method would be to make 16-chip boards by the official spec, and using the newer revision of chip that should allow each 16-chip board to push ~50GH.
The 8-chip board just results in more slots on the m-board being filled which is an issue if you don't sell m-boards to go with it. just my 2c
The 8-chip board just results in more slots on the m-board being filled which is an issue if you don't sell m-boards to go with it. just my 2c
Hash rate is very dependent on amperage an voltage and with positive correlations to both.
A rev.2 16 chip board wouldn't reach 50 easily with out some serious heat extraction and over clocking
It would be no problem at all if another 30A power phase was added to the board. But then you have 70+ watts to pull out of a board
That's some of the rationale I used when deciding 8 vs 16
I'm wanting to get the max out of these chips and and doubling the amp ration they each get is one way to do so.
If I knew that 16 could crunch along at 50 It would be a no brainer decision. But in most real life situations a rev2 16 ASIC card with heatsinking on the vrm and each ASIC
OV'ed to 0.833 would probably pull ~35-40 maybe 43
TL;DR: a 16 chip card won't run at the same per chip hashrate as an 8 chip card using the same 30A power supply.
This is because of thermal and electrical constraints
I was talking about this rev2 chip: http://www.bitfurystrikesback.com/product/bitfury-55nm-rev2-samples/
864 cores instead of 756 (14% more) and presumably the same or slightly lower power usage. All my 1.2 h-boards can be overclocked to ~32GH without heatsinks and up to 38GH with heatsinks. 14% more means you could get 36-45GH per card if overclocked. (which at current pricing and considering a 3week production, will only be able to sell for ~$75 each or possibly less)
Ah I gotcha now
I have 6 open slots on my v1.0 board. Would like to fill out, merely for OCD purposes. My v3 board will only take 12 cards, so hopefully the v1 board will take all 6.
The better method would be to make 16-chip boards by the official spec, and using the newer revision of chip that should allow each 16-chip board to push ~50GH.
The 8-chip board just results in more slots on the m-board being filled which is an issue if you don't sell m-boards to go with it. just my 2c
The 8-chip board just results in more slots on the m-board being filled which is an issue if you don't sell m-boards to go with it. just my 2c
Hash rate is very dependent on amperage an voltage and with positive correlations to both.
A rev.2 16 chip board wouldn't reach 50 easily with out some serious heat extraction and over clocking
It would be no problem at all if another 30A power phase was added to the board. But then you have 70+ watts to pull out of a board
That's some of the rationale I used when deciding 8 vs 16
I'm wanting to get the max out of these chips and and doubling the amp ration they each get is one way to do so.
If I knew that 16 could crunch along at 50 It would be a no brainer decision. But in most real life situations a rev2 16 ASIC card with heatsinking on the vrm and each ASIC
OV'ed to 0.833 would probably pull ~35-40 maybe 43
TL;DR: a 16 chip card won't run at the same per chip hashrate as an 8 chip card using the same 30A power supply.
This is because of thermal and electrical constraints
I was talking about this rev2 chip: http://www.bitfurystrikesback.com/product/bitfury-55nm-rev2-samples/
864 cores instead of 756 (14% more) and presumably the same or slightly lower power usage. All my 1.2 h-boards can be overclocked to ~32GH without heatsinks and up to 38GH with heatsinks. 14% more means you could get 36-45GH per card if overclocked. (which at current pricing and considering a 3week production, will only be able to sell for ~$75 each or possibly less)
Sent pm
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