Ummmm....thanks?.  You made my brains hurt!  Is that even....I don't know.  Apparently I've got some studying to do.  I better just read the manual from the beginning.  I'll see what I can figure out.

I'm sorry if this was already covered...so Ill keep it brief.  I have an AntMiner S3 that's a rockstar.  I overclocked it to 250 MHz, and it was hashing right along at 505-506 GH/s, even after 2-3 hours.  Temps were great 39C-41C, absolutely no X's on my chips.  This morning, I wake up...take a quick peek before heading off to work and it was sitting at 490GH/s, and it was still sitting at 490GH/s (rock steady) when I got home from work 10 hours later.  After work I calculated the HW errors and i'm sitting at 0.21%(pretty good unless I missed the boat).  Now I know that's nothing to complain about...and I'm not trying to.  I'm just wondering if anyone else has experienced a similar situation and has any kind of explanation or trick to get it back above 500.  Thanks.

JakeTri -- I would like to thank you for your work, I know the request wasn't mine, but I was wondering about this the same as la7eralus.  I'm interested in how you calculated those Reg. values.  I would like to break this down one more level and be able to find the nitch between 250 and 243.75.  I looked at the Reg. values and attempted to convert from HEX...but that didn't look even close to right.  So...i'm interested in how you calculated them.  If you could explain, or point me to some documentation that explains it...i would be grateful.  I have done a few Google searches...but found zip.  Any direction you could give would be appreciated.

PSUs are less efficient and will burn out sooner if you run them at full load.  My advise is to get yourself a gold or platinum certified PSU around 1000-1200w.  Overclocked at full tilt (350 MHz) you will pull apx 400w from the wall per miner...so your looking at ~800w for the pair. The conversion from 120V AC to 12V DC isn't perfectly efficient, so some energy is lost as heat(why PSUs have fans).  If you have a decent gold/plat PSU your looking at 87-92% efficient...so if your pulling 800w from the wall your miners are only consuming 696-736w...the other 104-64w are lost as heat. The less efficient PSUs (uncertified, bronze, silver) put out more heat, as the conversion is less efficient.  You also want to have some headroom on the PSU so your not pushing it at the max 24/7( = burnout & replacement costs).  I only use gold/platinum certified Corsair PSUs (wish I got $ for the free advertising) because they are pretty much tanks.  I'm running 4 Corsair RM1000 PSUs (gold cert.) and they have a 5 year warranty if I remember correctly.  They worked great on the S1s (I had 6 S1s overclocked on 3 PSUs...2 each), and the S3s.  You can do your own research, and this isn't exact ,but 80% of the rated load is normally approaching the point where efficiency starts to decline because of the heavy load/heat buildup.  You could also run an additional single blade(half an S3) if your not overclocking any of them...overclocked that would be using 1000w and would be incredably hard on any PSU.  My advise is pay the extra for a reliable strong PSU.  You also pay a little more for fully modular, but if you have alot of gear, it keeps clutter to a minimum....may not make a difference to you if your only going to ever have 2 miners, then modular doesn't matter so much.  Just remember...additional cables in the way reduces airflow and increases temps...maybe not to the point of making an impact...the rule holds true to life (ie...computer case cable management).  Good luck and happy mining.

The overall misunderstanding is in how an AC system works.  The AC unit is not pulling the hot air from inside the room to the outside.  What it is doing is a fan is pulling ambient temp air from inside your room,  and moving that air across a coil that is cooler than the ambient air. The colder coil absorbes some of the heat energy and removes some of the moisture via the beer can affect.  The ambient temp room air that has gone through the coil gives up some of it's heat into the coil, and left some of it's moisture condensed on the coil and is returned to the room drier and 8-15 degrees cooler than it started.  That particular AC is a closed system and doesn't move any air from inside the room to the outdoors, or from the outdoors to the inside of the room.  The hot air you feel coming out of the AC on the outside is the "heat energy" collected from the inside air through the cooling coil.  On the outside, another fan blows the outside ambient temp air across the now hot coil, pulling some of the heat from the coil then recirculates the reduced temp coolant back to the inside to soak up more heat energy from the ambient inside air.  I found a good video that illustrates how it works on youtube.      http://www.youtube.com/watch?v=6OU7WHgJ_cY

Air from inside the room is blown across the cooling coil, then back into the room, this keeps the pressure of the room static or unchanged. 

Now with the miners doing what they do, how you currently have them configured, is attempting to pull cooler air from inside the room through the heat sinks, picking up heat energy, and exhausting that warmer air outside the sealed room.  With no air being let into the room (not through the AC as previously assumed) and all of those miners trying to pull air out of the room...creates a vacuum or negative pressure zone, that's why the door slams shut since it opens to the outside of the room which is now a positive pressure area relative to the lower pressure inside the room.  If that door was hinged on the other side of the jam and swung into the room, the miners would be sucking the door open when pulling air into the room.  Your concept is pretty good, however, you should try sealing the miners inside the room entirely.  Seal off all the exhaust holes, and mount the miners vertically so they are sucking cooler air up from the floor since colder air sinks, and exhausts out the top as hot hair naturally wants to rise away from cooler air.  Then your room will be back to a static pressure area, where the cooler air coming out of the AC unit sinks to the floor, gets pulled up through the miners heat sinks and the warmer air naturally wants to rise out of the miners.  In this fashion, your using the miners fans to help the already natural convection current, of cooler air down, and warmer air up.  I have my miners running in a small room, the ambient temp of the room about waist/chest high is 78-80F.  I have my miners mounted vertically, pulling in the air from down by the floor ~74F, (2-3 degrees cooler than midzone), when it comes out of the miners, its much warmer ~94F(warmer than midzone) and rises to the ceiling where it's apx. ~82F.  If you mount 3 digital thermometers in your room, you see the thermocline, or temp difference between the floor, mid, and ceiling height.  Give it a shot...your miners will never run cooler unless you put em in a freezer.

I got in on the B2 batch of Antminer S3,  below is info from Bitmain website.  Below that, is the info from UPS order tracking w/ time stamps.

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Info from Bitmain Website

Order Placed
DATE:
2014-07-01 20:31:24

Payment Confirmed:
Date   2014-07-01 21:15:06

Shipped:
Date   2014-07-19 10:08:26

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Info from UPS Tracking:

Scheduled Delivery:
Tuesday, 07/22/2014, By End of Day -- Minnesota USA Local time which is CDT

Location   Date   Local Time   Activity
Shenzhen, China    07/19/2014    11:22 P.M.   Origin Scan
                          07/19/2014    5:02 P.M.   Pickup Scan
China                    07/19/2014    4:08 A.M.   Order Processed: Ready for UPS

I'm having a hard time getting this to work.  I followed giletto's instructions, and did end up getting balance mining to work between multiple mining pools but I would like to have the increased control that adding quotas provides.  I have tried leaving the "balance" mod in place while adding n4spd mod...didn't work.  I also removed the "balance" mod and then tried this "quota" mod...again no luck.  Any idea, or does someone have a link to the entire instructions starting from stock?  Thanks in advance for any help provided.