Has anyone discovered how to clock these to 375 ?
nope, scratching my head. also emailed ktzhan, waiting for a reply. Any inputs would be welcome. #option 'freq_value' '0780' #400M
#option 'freq_value' '4e81' #375M
#option 'freq_value' '4d81' #350M
#option 'freq_value' '4c81' #325M
#option 'freq_value' '0580' #300M
#option 'freq_value' '0981' #250M
#option 'freq_value' '4f02' #190M
Simple pattern matching suggests that for 375 the last 2 hex digits probably would be 0x..81 |
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Somewhat related, one of the boards I needed RMA'd made a really subtle and creepy electrical whining sound. In fact, I think I'll record the sound of it and add it to my library for use in an upcoming project... Yup, it's coil whine  |
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Just debugged a board with 4 dead chips! a) replace chip 1 with chip2, no fish, frustration level 1 b) replace chip 1 with chip3, no fish, frustration level 10 c) replace chip 1 with chip4, no fish!, scratch head, solder external power supply, frustration level 1000+ d) finally replace chip 1 with chip5, and the chip worked! 4 dead chips in a row, starting from chip1.  |
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What is do is the following
a) set voltage to 0.9v using cgminer
b) set clock to 700
c) set memory to 1200
works a charm with 7990.
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My little celebration   |
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Eh? How would disabling lowmem decrease CPU usage?
It decreases the amount of time the system needs to spent to hassle with memory swapping and moving. hmm, disabling lowmem should increase the number of shares that are cached in the RAM. It should not have a huge effect on CPU usage unless caching less shares leads to higher cpu usage which i doubt. --lowmem Minimise caching of shares for low memory applications
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picked mine up from UPS today (driver falt out lied about coming to my house yesterday, since i had a note on the door with simple instructions, and there wasnt even a delivery attempt sticker left behind *furious*), and havent plugged it in yet.
build quality is fantastic and shipping package excells (the metal frame tore small holes in the static bag, but thats the only 'damage'. Better than asicminer and bitfury in both regards
Glad that you finally received your gear, happy mining. Up and running. heres my brief review: packaging: A+ build quality: A (pci-e sockets would be nice, and the fan/heatsink setup could use some tweaks) ease of setup: B+ (fairly simple, but it could be made easier, such as the default gateway being 192.168.1.1 like 75% of people use) operation: A+ (stable running, 177GH average right now) NOISE: C- this unit is VERY loud. loud enough i am reconsidering my desire to buy another. The fan cools half the heatsink effectively, but the further half of the heatsink is simply having warm air blown across it. the exhaust air is warm-bordering-hot. I am sure that a slightly revised design with 2 fans blowing from above or both sides and being channelled outwards more effectively would allow a much quieter design. overall: B+ Bitmain delivered a working product and did a quality job of it. however, the cooling system leaves a lot to be worked on, and i hope some forum users post hacks or mods soon such as push/pull configurations or different orientations of the device. the mining status looks a bit odd though, am i correct to read this as a LOT of hardware errors and rejects? Elapsed GH/S(5s) GH/S(avg) FoundBlocks Getworks Accepted Rejected HW Utility Discarded Stale LocalWork WU DiffA DiffR DiffS BestShare 35m 2s 173.76 177.54 0 62 165 1 353 4 116 0 105,626 2,480 84,480 512 0 63,729 What are your temps and fan speed? My unit starts becoming loud at >4Krpm, but everyone has different noise tolerances, and mine's a bit high due to constantly working in server rooms and in HPC system rooms. |
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I boot up and the last lines read:
/dev/mmcblk0p2 contains a file system with errors, check forced
/dev/mmcblk0p2: Resize inode not valid.
/dev/mmcblk0p2: UNEXPECTED INCONSISTENCY; run fsck MANUALLY.
fsck died with exit status 4
failed (code 4)
[warn] the root filesystem is currently mounted in read-only mode. a maintenance shell will be started
give root password to log in:
your FS messup that why you cant boot up. f--k. figured as much. time to reload an image (i should back up my sd more often) back up and running, minus a few miner tweaks and a chainminer update If you have an SD card reader / or a digital camera connected to a Linux box, you can try to run fsck on /dev/sd |
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something has happened.
the webUI is not accessible at 192.168.1.249
SSH times out trying to communicate
Ive tried with a second SD card to no avail, and the first 4 leds on the RPI are lit (ACT is not)
Do you have a micro USB phone charger, spare hdmi cable? YOu could use that to test your rPI with a HDTV / Monitor |
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How do you like that power supply otherwise?
Do you guys think the energy savings between gold and platinum is worth the price difference?
I have bought quite a few PSUs for GPU / ASIC mining, including Gold, Platinum, Bronze and vanilla 80PLUS (Antec, Rosewill, Seasonic, Sparkle). IMO cheaper Platinum (Rosewill, etc.) are kind of like the best Gold PSUs (Seasonic Gold). I have regularly overloaded drawn ~10% more than rated power on Gold PSUs and they are very accommodating in that sense. Voltage stability is a hit / miss even among Gold / Platinum rated PSUs. I have a Sparkle Platinum PSU which has very poor voltage regulation, 11.55V on the 12V even at moderate loads. Seasonic Gold have excellent voltage regulation. My rule of thumb is 80Plus Gold or higher. 80Plus vanilla and Bronze are a strict no-no unless you want an additional heat source, get free electricity or got the PSU for free. They donot take kindly to overloading as well. The difference between Gold and Bronze / 80PLus is remarkable. |
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Excellent thanks! Also can you please instruct us how to decipher the clock frequency from the 4 hex values for e.g. how does 400MHz correspond to 0x0780? Thanks a lot. |
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picked mine up from UPS today (driver falt out lied about coming to my house yesterday, since i had a note on the door with simple instructions, and there wasnt even a delivery attempt sticker left behind *furious*), and havent plugged it in yet.
build quality is fantastic and shipping package excells (the metal frame tore small holes in the static bag, but thats the only 'damage'. Better than asicminer and bitfury in both regards
Glad that you finally received your gear, happy mining. |
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Up and running, 130 Gh/s  BTW some seasonics donot turn on the fan when the PSU is cold. |
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Any idea how we can change up the CGMiner parameters ? Would like to play around with removing --lowmem as I've read that can cut down on CPU useage.
I have one miner with lowmem and another without, donot see any difference in hashrates though. Are others seeing significant differences? Thanks |
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Many thanks Goxed, you have put my fears about the hardware to rest with the shot of your pool stats Cool |
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as i cant edit
for example i guess your worker diff is 128
13841*128=1771648
then its mean u got 3%hw errors
63253/1771648
My diff is 256 fixed. Thanks |
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So the miner fan and the PSU fan are working against each other ?! Why do you think so? It's a push-pull not push-push  ! |
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Mining doesn't use a lot of bandwidth so you should be fine. I did it on my GPU mining rig for a week.
Same here did for a few days when DSL line stops working. Worked a charm. Also played Battlefield online with 4G |
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Did anyone see any improvements after flashing bitburner fury firmware ? Thanks a lot
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