Topic: Antminer L3+ OVERCLOCKED !!! HOT !!! full review with LOTs of pics (Read 24363 times)

To much OC. My L3+ runs with 580mh @ 820w and the other one with 620mh @ 920w and fan lowered to 40%

https://imgur.com/Iaz9Qrx


my l3+ run solid everyday with 1-2hw/min at 640+ and about 3 rejects in 16hrs // stable around 60°c on 85% maunal fan 1088w apw7 on 120



one of my L3+ has a lazy board that wants to work when it feels like it... loose contact somewhere... i quit messing with it... EVEN THAT one hashes around 490,mh/s ON 3 boards...

https://imgur.com/dbzC7wg

https://imgur.com/qCLciw5

HW Errors are specific to each Hashboard.

If they rise significantly with OC that´s a bad sign.

I have had mine at 412Mhz for 3 hours and am getting around 540Mhs, so far I have 4 HW errors on one of the boards and 0 on the others. Temps are 44 PCB and 51 Chip, Fan 1  3,630 Fan 2  3,540 . What is an acceptable amount of HW errors to be getting?

Good Morning,

actually my new L3+ (with N-Boards) are running with 425 MHz (that´s around 555 MHs).
They are doing well and HW-Error rate is very low.

I heard from other Miners that they can handle 450 MHz also.
But in my humble Opinion it´s a Lottery with the new Boards.

Anyone here with December and January Batch ?

It would be interesting to know when Bitmain changed the Boards.

Thank you for the info about the board types, I have the newer (worse) type in my L3+.

Would this mean that using the OC of 412M is "pushing" the OC to the limit for this board type and therefore may/will compromise the chips etc in the long term?

Anyone have experience OCing the newer board type and had it running for the past few months?

Hi there if you are using the new PCB i wont use more than 412M.
Thats around 540 MHash.

Hi Sakl,
I do have L3+ miners delivered in Feb 18 and was about to play with one when I stumbled on this post.

Miners are in a hosting centre so will have to wait for me to check which version hasboards they have but has anyone tried to overclock the Hashboard L3+ (N) and if so what speeds was achieved?

Wow, bastards took out nice polymer caps for aluminum ones. That is saving them like 25 bucks per board.

Be aware there a two different Hashboards actually.

https://support.bitmain.com/hc/en-us/articles/360002072833-L3-Different-Version-Comparison

Hashboard L3+ (S) is the old PCB and could handle Overclocking up to 600 MHs
Hashboard L3+ (N) is the new PCB and is very poor in Terms of Overclocking (around 540 Mhs only)

So be aware when overclocking newer L3+ they have changed the Boards somewhere in early 2018.

With blissh mode 504mh at 700w.
You guys talk about overclocking. Temps etc what about HW errors tho? What's acceptable level per day per board?

That's a cool admin/management tool you have there.  What system that?

I have 4 L3+`s and i have been mixing the hashboard between them to end up with 2 that have been running stable at 500 Mhz for 4 months now, 1 that is set to 487 Mhz stable for same period and the last one at 481 Mhz stable for same period. There is no problem overclocking these units quite much. Those at 500 Mhz is using about 970w at wall with 94% eff. psu. Temps are about 55c to 68c, with fans @ 80%.

Been running for like half a year or so like this.


I would NOT recommend overclocking any other Bitmain product like this, only L3 can do this primary because its not as much a prosessor heavy algo but more memory hard.

I have been running my puppy on 438 MHz for 2 months now at 570 Mhs. inlet temp is 25 C and hottest chip is 63 C. Fan 1 @ 3,594 RPM / Fan 2 @ 2,076 RPM
I think it's a sweet spot for me. I measured the power draw but I forgot. It was a tad higher than stock.
More hash gain then power draw. If any1 wants I could pull the plug and place my meter.

I have overclocked to 450M and chip temps are  60-65.

What temperatures do your chips have and how do you cool them?  Mine are in a data center with 18°C cold air but my chips run as hot as 65-70°C with only 450M and 580MH

I run my own L3+ using APW3++ (1600W) on 220v supply. With these I find the best results with the following settings:
475M 100% manual fan speed - 620Mhash
462M 100% manual fan speed - 600Mhash

Some miners get higher hardware errors above an acceptable level at 475M so they are set at 462M. We are able to run all miners at these two settings and have consistently low hardware errors (max 0.2% and usually less than 0.1%). We have not had hardware failures over many months on these settings.

I have had my L3+ for several months now, all running at 419 MH/z frequency, hashing at ~550 MH/s. I have three 240V receptacles installed specifically for my miners. I use a 240V PDU (power distribution unit) made by TrippLite, each gives me 8 C13 and 2 C19 outlets which are capable of distributing a total of 20 Amps (de-rated to ~18 Amps) each. I always keep spare/backup parts on hand, including several HP Platinum 1200W and 1500W PSU's which I have accumulated over time. In addition to my backups, I discovered 2 HP 1500W Platinum PSU's in a box a few days ago and decided to use them on 2 Antminer L3+ miners (which were using HP 1200W Platinum PSU's). I have observed them for ~72 hours now, and the results have been phenomenal!

The L3+'s that are using the 1500W PSU's have been running a few about 2 degrees cooler than the others (which are right next to one another), have seen very little (HW) hardware errors (very minimal comparatively), and so I've decided to overclock them a bit more, and came across this thread while doing some research to see what frequencies others have been successfully using.

I have decided on starting with 475MH/z and will closely observe for a day or two. I will also report back with the results afterwards. In regards to anyone wondering what the best PSU might be for an L3+, I would most definitely spend an extra few dollars to purchase an HP 1500W Common Slot Platinum PSU as opposed to the 1200W ones in the same HP line! Keep in mind that the 1500W PSU's can ONLY run on 240V lines, and you will also need a quality breakout board that can safely handle the power (according to the meters on my PDU's, the L3+ miners are drawing ~3.5 Amps each).