Well, these two units are currently running approximately one (1) inch away from each other, so the environment is pretty constant. The difference between the two is the difference between an average DC-DC temp of
ASIC slot Temperature DC/DC avg temp Clock Type
1 --- --- --- OFF
2 32.5 ℃ 47.4 ℃ 225 MHz TI
3 --- --- --- OFF
4 --- --- --- OFF
5 --- --- --- OFF
6 41 ℃ 62.0 ℃ 275 MHz TI
Which is pretty big for that extra 10mh.
You mentioned that your power supply cables melted at least once, and I just saw a picture of a guy's power supply that basically started to set fire to his house. Glad his house did not burn down, but the problem was the same, power supply cables melted. Fixing melted units that blow the PCB connectors is a real bear and I just got a Neptune in that had a blown power cable that led to a short on pin 6 (this time to the .7 line which allows it to work, but very weird) which proves board burns can damage other Neptunes and Titans due to the lack of signal isolation on the controllers and/or the units.
Perhaps a good code release would be a "do not pull more than X watts from the supply lines" so people could put in 180 to be nice and comfortable up to 260+ if they really want to see things go foom or something. As always I stand by to fix the blown cubes, but it would be better if they didn't blow in the first place.
That may be doable, but it requires extremely accurate testing of the DCDC power draw under a bunch of different settings & temperatures. Gathering that data would be the challenge.
Also, way more power gets drawn through these connectors than 180 or even 260w ... @ 325mhz w/ slightly than lower factory voltages ... about 330w is drawn through that poor 6pin connector on Titan side =(
Thats why they went with the Y adapters so each 6 wire cable was at about 150-170w.
I suspect many PSU's breakout panels for their modular connectors arent rated for that type of current @ 12v ... which is where my PSU's cables started discoloring and getting real hot and eventually melting the PSU breakout panel connectors.
I suspect a non modular PSU would fair better. But cant find high effeciency nonmodular high watt ATX PSU's anymore it seems =/
Thats why I was contemplating going w/ the server PSU's w/ the breakout boards made by users on this forum... they are probably much better quality than the breakout boards on modular PSU's.
I bet, making the Y connectors into 3 way Y connectors would definitely drop the strain on the ATX cables =)
That would drop the watts per cable down to about 110w.