A few observations and a question from a new 2Pac owner. Will try to limit eye-rolling numbskullery in my first post. I've read perhaps 60% of this thread and will be embarrassed if I repeat an answered question.

I have a single 2Pac bought off ebay because I wanted to play with a single unit. Mining on slushpool for giggles, and have been running at various speeds and difficulties for a few days. Network latency has a noticeable effect on scoring hashrate for me, and the best I've managed to date it a ~5 hour sustained period of scoring hashrate of ~26 GH/s.

It's nice hardware, and I hope sidehack's proud.

Run overnight with minimum difficult 512 sustained ~20.5 GH/s scoring hashrate from my current high-latency network location. @375 MHz.

Bumping up to 425 MHz and difficulty 128 it's heading back up to ~24 GH/s At any clockspeed It's difficult sustaining WU/m > 320, but 375-425 MHz gets the highest scoring hashrate on this stick. (One half hour chunk of time @ 29 MH/s scoring hashrate. Think it'd be higher still if slushpool accepted difficulty < 128 and I was running in the low latency network.)

Running a USB hub with a hacked in buck converter I've limited to to 3 amps, and attached to a dirty great copper heatsink from an old Xeon server, I'm sitting at 35°C @ 425 MHz.

I have quite a few heatsinks from retired servers. The current style would fit 6 or 8 2Pacs and still be well under the TDP capacity of the heatsink. I have a small machining shop and will probably muck about with back side heatsink clamps to increase evenness and clamp force. Leftover watercooling and phase change will probably come into play at some point too, not because it's cost effective, but because it's amusing.

My particular stick has a 0.258 V difference between the two ASICs. N0 always has the lower voltage across the cap. Inrush current can be an issue when starting cgminer, and I'm contemplating some PCB mods for grossly oversized low ESR tantalum caps to see if this helps.

Questions for the delightful curmudgeon, or anyone else who's had at these with a soldering iron:

1) Is the voltage difference between the N0 and N1 ASIC something I can remedy with careful installation of a precision multiturn trimpot in parallel (or series, to avoid R=0 smokeletting) with an existing resistor? I appreciate the risk inherent in this.

2) I'm in Australia and local purchasing options are borked. I'd like to buy 10-20 2pac sticks, whatever quantity is worth sidehack's time. Never mind, found the email address in the [FOR SALE] post.
If I successfully purchase 20 I'll probably shift up to 10 units to desirous AU residents at slightly above total cost to me. Because I think it's funny and am curious about the imminent pod miner, I'll drop any small profit back in sidehack's development fund.

I can probably offer a few ex-server heatsinks drilled and tapped for 2pac to the local market as well, but I'm in this for fun and education. Oh, and recycling.


EDIT: Had it running at 500 MHz for a couple of hours with 0 HW err, but hash rate topped at 21 GH/s. 325 MHz seems to be the most productive speed @ 0.731V  36 GH/s.