Will 2-pin Molex work on ModMinerQuad?

SigurdDragonslayer

newbie

Activity: 41

Merit: 0

Quote from: ReCat on May 30, 2013, 12:41:59 PM

Isn't the ModMinerQuad a scam? I feel like these are fake questions posted by a fake user to try to give legitimacy to the existence of ModMinerQuad miners...

Don't know, I bought mine from a user on the arstechnica forums before I heard they were a scam. I could have easily been scammed too, since all I had was his email addy Cheesy

. Luckily he was above board and I got it two days after paying.
Here's my (temporary) jankity little set up:
http://imageshack.us/a/img689/9100/screenshot20130530at310.jpg

SigurdDragonslayer

newbie

Activity: 41

Merit: 0

Thanks everyone for your advice, I reckon it's worth a shot, I get my raspberry pi tomorrow. Right now I'm wasting a whole tower on this guy.

Quote from: Bogart on May 30, 2013, 01:35:20 PM

2 wires should be fine. All FPGA miners I've seen need only 12V supplied.

The only worry I'd have is that a 50W supply on a 40W board doesn't give you much headroom. It's gonna be working pretty hard most of the time to supply that load, which will go up as heat increases, or if you overclock.

Thanks, I'm a little worried about that too, would the power supply just fail, or could it destroy the fpgas? I'm not planning on overclocking, and I have a fan blowing on them that keeps them around 45-46ºC.

Bogart

legendary

Activity: 966

Merit: 1000

Quote from: SigurdDragonslayer on May 29, 2013, 01:24:18 PM

I bought a Molex power adapter with plans to switch my Mod Miner Quad to a raspberry pi rather than a full computer with PSU. Found one that does 12V, 4.15A, 50 Watts.
When I received it, I was surprised to find only two of the four molex holes have connectors. I disconnected my MMQ from my computer, and plugged in the 2-pin adapter, and all the LEDs came on, but I was too worried to actually try mining that way.
The MMQ says it needs 12V and 40 Watts, so I thought the adapter would be fine, but I'm worried that having 2 pins instead of 4 will cause a problem.
I'd really appreciate if someone could let me know if it won't be a problem, or if I just wasted $20. Obviously I'm an idiot when it comes to electricity.

2 wires should be fine. All FPGA miners I've seen need only 12V supplied.

The only worry I'd have is that a 50W supply on a 40W board doesn't give you much headroom. It's gonna be working pretty hard most of the time to supply that load, which will go up as heat increases, or if you overclock.

ReCat

sr. member

Activity: 406

Merit: 250

Isn't the ModMinerQuad a scam? I feel like these are fake questions posted by a fake user to try to give legitimacy to the existence of ModMinerQuad miners...

crazyates

legendary

Activity: 952

Merit: 1000

Quote from: th3joker on May 29, 2013, 05:46:51 PM

I run a pc PSU which cost about £15 ~ $22 and it runs fine, I switched it out for a higher rated one when I attached a Delta Fan to the bench to cool the quads down. Now that makes some NOISE :-)

When I run two modminer quads from a single strand with two molex's on it get's really warm so I guess they pull enough to do that combined.

Also I think the bricks are slightly less efficient than PC PSU's worth checking if you can measure the draw at the wall with something like a kill-a-watt.

I use a piece of earth wire from a twin and earth 2.5mm cable to short the pins on the PC PSU so it starts up when you plug it in.

LOL you realize that Delta fan is probably using more power than the MMQ? Those things only use like 10W each chip, so 40W total for each MMQ.

th3joker

sr. member

Activity: 319

Merit: 250

I run a pc PSU which cost about £15 ~ $22 and it runs fine, I switched it out for a higher rated one when I attached a Delta Fan to the bench to cool the quads down. Now that makes some NOISE :-)

When I run two modminer quads from a single strand with two molex's on it get's really warm so I guess they pull enough to do that combined.

Also I think the bricks are slightly less efficient than PC PSU's worth checking if you can measure the draw at the wall with something like a kill-a-watt.

I use a piece of earth wire from a twin and earth 2.5mm cable to short the pins on the PC PSU so it starts up when you plug it in.

ReCat

sr. member

Activity: 406

Merit: 250

Quote from: crazyates on May 29, 2013, 01:31:43 PM

Sounds like it's just missing the 5V wire, and one of the grounds. If the MMQ needs any 5V power at all, it will just crash. It can't harm anything, however, so might as well try it.

Not so sure. What if it uses both the 5V and 12V to distribute the current load, resulting in only 12v overloading the current somewhere and causing damage? Idk if such a design would ever be used. Your best bet is using a multimeter to determine if it actually is drawing power on the 5V line.

SigurdDragonslayer

newbie

Activity: 41

Merit: 0

Quote from: crazyates on May 29, 2013, 01:31:43 PM

Sounds like it's just missing the 5V wire, and one of the grounds. If the MMQ needs any 5V power at all, it will just crash. It can't harm anything, however, so might as well try it.

Great, thanks!

crazyates

legendary

Activity: 952

Merit: 1000

Sounds like it's just missing the 5V wire, and one of the grounds. If the MMQ needs any 5V power at all, it will just crash. It can't harm anything, however, so might as well try it.

SigurdDragonslayer

newbie

Activity: 41

Merit: 0

I bought a Molex power adapter with plans to switch my Mod Miner Quad to a raspberry pi rather than a full computer with PSU. Found one that does 12V, 4.15A, 50 Watts.
When I received it, I was surprised to find only two of the four molex holes have connectors. I disconnected my MMQ from my computer, and plugged in the 2-pin adapter, and all the LEDs came on, but I was too worried to actually try mining that way.
The MMQ says it needs 12V and 40 Watts, so I thought the adapter would be fine, but I'm worried that having 2 pins instead of 4 will cause a problem.
I'd really appreciate if someone could let me know if it won't be a problem, or if I just wasted $20. Obviously I'm an idiot when it comes to electricity.

Thanks!

http://imageshack.us/a/img94/7073/screenshot20130529at223.png

Topic: Will 2-pin Molex work on ModMinerQuad? (Read 1109 times)