I joined the 5 gigahash club

[mdude77]

It's been a bumpy ride but I'm there.  5x7970 and 4x5870.  The 7970s are at 1125/975, and the 5870s are at 900/300.  The 7970s get minimum 655 a piece, and 5870s get minimum 425 a piece.

Things I learned:

- The above config on the same 15A circuit will tend to trip the breaker when using the above settings.  Lowering them to 1100/950 and 800/300 will work as a stop gap measure while you're at your "day" job.

- The above config makes one surge protector's plug a little too warm for my liking.

- Separating the loads into two 15A circuits works great when both surge protectors are decent quality.  But when one is cheap, even if it says it's rated for 15A, well, isn't guaranteed to work.

- This is about all the heat I can properly dissipate without doing some serious ventilation work.

M

[1715054587]

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[1715054587]

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[rjk]

Note that technically a "15 amp" circuit should be derated to 80% load for continuous applications in order to remain within code spec and to give yourself a safe margin. Same with 20 amp circuits. If any cords or such things are getting warm, that is not a good thing.

[mdude77]

Note that technically a "15 amp" circuit should be derated to 80% load for continuous applications in order to remain within code spec ad to give yourself a safe margin. Same with 20 amp circuits. If any cords or such things are getting warm, that is not a good thing.

Noted.  I'm within margin now. 

It's been a learning experience to say the least.

Next upgrade will be a FPGA.  And it'll be a while...

M

[bitlane]

Something about this seems shady.... definitely shady.
Are you using your hashing power for 'shady' ventures ?
(or are you still pissed off that your invite has not been approved yet ?)

[mdude77]

Something about this seems shady.... definitely shady.
Are you using your hashing power for 'shady' ventures ?
(or are you still pissed off that your invite has not been approved yet ?)

I appreciate your concern.  Just ozcoin though, no worries!  Thanks!

 

M

[bitlane]

Something about this seems shady.... definitely shady.
Are you using your hashing power for 'shady' ventures ?
(or are you still pissed off that your invite has not been approved yet ?)

I appreciate your concern.  Just ozcoin though, no worries!  Thanks!

 

M

Thanks for not getting pissed at my terrible sense of humor....LOL
I had to make a tleast a couple references to 'shady' after reading your anti-GPUMAX posts....
Happy Mining !

[bitlane]

As a side note....

Like you, I too am part of the '2x 15A circuit split miners' with my 3x 5-card 7970 rigs.

On each 15A circuit, I have an APC XS 1300.
I am still testing efficiency/overclocking etc....so right now, 15 cards all running 1.025V / 975mhz GPU / 850mhz MEM.

Looks like this...

[Dexter770221]

Good and operational breaker at nominal current (in this case 15 amps) should break after 6 hours in normal conditions (25C ambient). That is normal operation. For 24/7 it should be loded with 80% of nominal current or less...

[mdude77]

That's a nice setup.  I have three 750 power supplies and a 630 powering mine, with two 5870s and two 7970s going to each circuit.  No UPSs yet.  I did some brief looking at them and didn't see any that looked to be reasonably priced that would handle the load I would be putting on them.  If your UPS is at 1300VA, that means you're right around peak for it, so you'd get what, 5 minutes, if that, backup?

M

As a side note....

Like you, I too am part of the '2x 15A circuit split miners' with my 3x 5-card 7970 rigs.

On each 15A circuit, I have an APC XS 1300.
I am still testing efficiency/overclocking etc....so right now, 15 cards all running 1.025V / 975mhz GPU / 850mhz MEM.

Looks like this...

[bitlane]

The UPS's batteries are dead....no power/battery backup.
I have a few of them that I got from a client who invested in rackmount gear and these were given to me for nothing.

I use them for power/line conditioning, stats display/monitoring and overall power distribution. Just a pair of glorified power-bars with LCD read-outs

[mdude77]

The UPS's batteries are dead....no power/battery backup.
I have a few of them that I got from a client who invested in rackmount gear and these were given to me for nothing.

I use them for power/line conditioning, stats display/monitoring and overall power distribution. Just a pair of glorified power-bars with LCD read-outs

I've got a bunch of 1250AVs sitting around like that.  I might put one in line and install the software to see what type of power I'm pulling.  Heck, the rig is more valuable than the computers they are on now, I'll put two there and see.  Good idea, thanks!!

M

[bitlane]

Even though I am running all Windows-based Rigs, I don't have any UPS software installed or a management/info connection to the UPS' themselves.
Just power-IN...and power-OUT.

My main purpose was load display (glorified power-bar and kill-a-watt combined...lol), to help avoid breaker tripping and fine tuning of my undervolting/overclocking.

Of course, if the units that you have do not have an LCD display, the software and management/console/USB cable would definitely be required for revealing running conditions/stats etc.

[mdude77]

Even though I am running all Windows-based Rigs, I don't have any UPS software installed or a management/info connection to the UPS' themselves.
Just power-IN...and power-OUT.

My main purpose was load display (glorified power-bar and kill-a-watt combined...lol), to help avoid breaker tripping and fine tuning of my undervolting/overclocking.

Of course, if the units that you have do not have an LCD display, the software and management/console/USB cable would definitely be required for revealing running conditions/stats etc.

These are very old, no visual outputs. 

M

[Aseras]

As a side note....

Like you, I too am part of the '2x 15A circuit split miners' with my 3x 5-card 7970 rigs.

On each 15A circuit, I have an APC XS 1300.
I am still testing efficiency/overclocking etc....so right now, 15 cards all running 1.025V / 975mhz GPU / 850mhz MEM.

Looks like this...

Check your sockets on those apc. I used the same for my miners and it was slowly melting them. They use very low temp plastic. I switched to smart ups XL with proper plugs and have t had an issues.

[CMyers]

OP:  I'm right where you are, 5-6 Gh/s on two 15A circuits, and 90% of it in one small room.  My mother-in-law tripped one of the breakers once by plugging in a vacuum cleaner in the next room - that was fun to explain.   

I'm running a 100W exhaust fan and another open window with a filter on it.  Not sure how well that's going to work when the ambient temp starts peaking at 100F in a month or two.  The room's already unpleasant enough to keep me from entering until late evening.

I guess if it was easy, everyone would be doing it...

[foggyb]

Not sure how well that's going to work when the ambient temp starts peaking at 100F in a month or two.  

Not well. Prepare for hardware overheating problems. Lower clocks, etc. Add more cooling and/or airflow. I learned this last summer & only had 4GH.