I believe this member is either going to run off with the money, or is building trust and is going to increase the next asking loan to over 1 btc.

Denied.

No one will buy them since bitmain is giving them away for free.

Bingo!  This is why no one cares or is talking about it.  At this point, if you give your money to one of these companies on a pre order product that doesn't exist yet, we all know you're going to get ripped off.  It isn't news when it happens any more then the sun coming up tomorrow is news. 

Ladie and Gentlemen, here we go, the ball is starting! All aboard, those scammers are about to live in a nightmare....

https://www.cryptocoinsnews.com/magnus-daar-esq-knc-miner-hurts-swedens-reputation-business/

That's because no one has one. They are the same as an S3 though, so if they're running at 1TH/s they're probably clocked at 250MHz.

What are these chips clocked with to begin with?

cutting it REALLY close - good chance you'll have to underclock in order to run stable, especially if the coolant pump draws an extra ~20w. IMO get a 1000W PSU and youll be fine, and your efficiency will be a bit better (most gold PSUs are ~91% efficient at 80% load, but only ~85% efficient at 100% load)

oh hooray!!

yet another shoddy, overpriced rig from bitmain....

such surprise, etc

They not number I pulled, they're numbers I've personally tested on equipment I own.
For instance, this is a stock Hyper 212 Evo keeping a Habanero under 90C while dissipating ~180W through the chip.
https://bitcointalk.org/index.php?topic=519943.msg6714539#msg6714539
Using a 200+CFM server fan, I've pushed over 350W at the wall (closer to 300W at the chip) with the same cooler.
I have some Habaneros pushing 600W into the chip running a single H80i with a 240CFM fan.

I don't think dogie is totally wrong, you *can* find air cooling that handles 350W but as I showed above its often large, top-heavy monstrosities that cost as much as a liquid-cooling solution. That windforce one you mentioned is for GPU so doesnt make much sense in this regard.

IMO, dogie is 90% right - cluster the chips and place mounting holes for common CPU heatsinks. Let the buyer go and get a decent liquid-cooling system from thier local market and most of those can easily take 300-400W TDP for a fair price and small footprint. Additionally, they can be salvaged and used on other equipment in 12 months from now when the HEX4RB is no longer profitable. (or if the HEX4RB underclocks to ~200W TDP in 6mos from now it can be swapped for a more tame air cooler)

Coolers don't have a single parameter that defines how much power they can dissipate. I could dissipate 1000W from a stock Intel CPU cooler with a little airflow, depending on parameters. Most mining ASICs are designed to run pretty hot and acoustics are much less important than they are in a desktop computer. I can't speak from experience with the RB chips in particular, but with a flip chip package it's absolutely possible to dissipate 300W of heat using a relatively inexpensive air cooler like the Hyper 212 Evo and a high flow fan. I'd agree about using water cooling though; it does make things easier and isn't much more expensive in low volumes if you keep your eyes open. I just bought six H80i's from Newegg for CDN$284 (about US$255), and you can dissipate 550-600W at the chip (~800W at the wall) if using a high flow fan while keeping die temps at or under 100C.

Stupid, even if you somehow, get ROI in 6 months, you will have negative cash flow after that. Do you know what that means? (since you seems to understand ...... investments and all)

And if you count on BTC price, then buying BTC now with it in your hand.... you wont lose opportunity in case BTC price jumps in less than 6 months.



However, all of these is moot because you WILL NOT have ROI with S4s. We're talking about ROI btc here.

1.47 BTC for a Prisma ASICMINER 1.4Th/s+ miner.  Not so sure about that research