Yes, that's normal. The S4's power switch isn't a regular toggle switch like ATX PSUs. You'd need to rig something to keep the button depressed all the time. I know of a way, but I won't post it because it might not be safe considering the sometimes spectacular fashion these PSUs die. I don't want to be responsible for a fire.

How much of an issue is it really anyways? Does your power go out every week or something?

The best mod you can do on the S4 is replacing the PSU which is a ticking time bomb, 4 out of 7 of mine failed, and the only reason I still have 3 working PSUs is because I pulled them and replaced them with proper server grade PSUS before they died. (IBM DPS2000 [2000w] and IBM H-2880 [2880w])

The fan mod isn't dangerous IMO, and bitmain adding the feature officially (via --bitmain-homemode toggle) seems to support that. If you don't care about noise, then no need to run that way except perhaps to prolong fan life. Yes, the fans fail often also. I brought 2x S4s into my house to run in the basement to provide heat during the past winter, and slowing the fans down made that possible in my case. Don't think my woman would have tolerated the noise else-wise. You aren;t actually slowing the fans down, rather pushing back the temperature at which they ramp up. Seems to cause a ~5c increase in temps, which is fine and a good tradeoff IMO.

I was told lower double digits when I PMed him.

Suggest you look into different hardware that isn't intentionally gimped by bitmain.

Good luck either way.

Forget about undervolting, bitmain has disabled voltage control starting with firmware released on Jan 29th. If you want to undervolt and underclock, you'll have to use firmware from Oct. 16th.

The S4 should run on either 120v or 240v. You shouldn't be blowing fuses.

Hmm, looks like I'll have to dig. Thanks for the tip.

Difficulty should be handled this way: No lower than user's set difficulty but can increase if set too low.

Is there no way to force the difficulty setting? I received an Alcheminer 256MH/s today, and it needs 50000+ diff to work properly. Setting d=50000 (or any difficulty on any rig, really) on nice/westhash only starts the difficulty at that diff, then it gets adjusted up or down by the server. What's the point of being able to specify a difficulty if in reality it will get set automatically by vardif?

Voltage control is still locked down. Thanks, Bitmain. 

Yes, 10 AWG is what is needed for 30A, you're fine at 35'. Your PDU is likely also 30A, but derated (80%) to 24A. I've run my PDUs at 30A without issue, but try to keep them at a max of 27A.

How are you liking the switch to 240v from 120v? 

Ok, re-imaged the SD card and the update worked this time. Firmware seems to run a few GH/s faster, and minerlink has been added.

Now to bust out the DMM to see if the voltage is "fixed".

Great, just flashed the new firmware to test it and it fucked up the SD card. 

That's way too hot for such a low ambient temp. Check for dead fans, dust, etc. I had a unit that reported much higher temps than normal, I had to change the hashboards to keep the fans from running all out. It was a good 20c higher than an S4 sitting next to it at the same settings. You can also use --bitmain-homemode to reduce fan speeds.

I guarantee that if you have 4 working fans and it isn't clogged with dust, at least 1 of your boards are reporting incorrect temps.

Can you read? I said once they are released, no one will want a Titan. That's in the near future, not today. Titan's still have a dwindling value today.

Anti-DDOS function?   What the fuck!?

How about fixing voltage control and the J7 hashboard which is constantly overvolted to 0765 and completely uncontrollable??? That hashboard increases power usage by a lot, costing each and every S4 owner more electricity than a properly working S4 would and killing potential profits!

BitmainWarranty, can you please get us more details other than something something DDOS and improved minerlink? How is something improved that wasn't there in the first place, BTW? Guessing this FW adds it.

Yep. Titans are going to take a serious hit in price, no one will want KNC's junk when sfards rolls out.

You have to be a fool to mine here.

I've been having the same issue for the past 6 hours or so. Can't load bitcointalk without my VPN being enabled.

I can vouch for the A2 as well, I've had a 60MH and a 90MH unit since ~end of April 2014 and they just work. Very good hardware! I just ordered an Alchemist 256 since it's on sale. Figured why not? I have cheap power. Tom from Alchemist went out of his way to help me, great guy and great service. I'll have the miner Thursday, looking forward to getting it.

Emdje, Tom may be interested in providing you with a very discounted (maybe even free?) unit if you provide software support for his machines. They have no plans on updating the miners anymore, and from what I can see they could use some loving. PM me if you want his email to drop him a line.

I'm possibly picking up a used bonus Neptune, and my understanding is they were shipped without the VRM heat transfer pads that were factory installed on the original Neptunes and Titans. Has anyone found a suitable replacement for them? I assume they're needed for stable operation at 3~3.3 TH/s?

I also need to RMA a Titan cube that has 2 dead dies. Also have another cube with 1 dead die, but KNC won't RMA that one since I can overclock my cubes to reach 300MH/s anyways.  What kind of turn around times have you guys experienced lately with Titan cube RMAs?

Looking forward to details on availability and power consumption at the wall!