Quote from: klondike_bar on September 28, 2014, 04:16:57 PM

Quote from: BitcoinRuinedMyLife on September 28, 2014, 12:56:12 AM

Quote from: klondike_bar on September 27, 2014, 01:48:32 PM

250W TDP at 26dB (huge, using 2 120mm fans) http://www.bequiet.com/en/cpucooler/482
350W TDP http://www.techpowerup.com/141811/zalman-announces-cnps11x-extreme-cpu-cooler.html

IMO the only fan/heatsink coolers that can handle such wattage are massive monstrosities that almost certainly cannot be shipped mounted or they will snap the PCB/mounts, and would require a big open case to offer the airflow. Closed-loop liquid cooling seems like the obvious winner

No point, the dogie guy will dodge this scenario as he insulted me while being delusional and pretending that I was incompetent for pointing out his failure.

Don't forget those are manufactured specs. An example is gigabytes windforce cooler which they claim can dissipate up to 600watts.

https://bitcointalk.org/index.php?topic=706302.msg8868719#msg8868719

He mentioned high end air cooler or basic 120mm watercooler. I pointed out a dual 120mm closed loop cooler could do up to 300w but would love to see his unicorn air cooler.. Somehow he thinks quoting me as If I can't read and chose to not post this unicorn cooler and insult me instead, of course because we all know typing 3 words is easier than 30

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)

I mentioned a GPU cooler to point out the principle that because a manufacturer lists a spec. Just like when you read the CFM and static pressure of fans.

Quote from: MrTeal on September 29, 2014, 07:41:51 PM

Quote from: BitcoinRuinedMyLife on September 28, 2014, 12:56:12 AM

No point, the dogie guy will dodge this scenario as he insulted me while being delusional and pretending that I was incompetent for pointing out his failure.

Don't forget those are manufactured specs. An example is gigabytes windforce cooler which they claim can dissipate up to 600watts.

https://bitcointalk.org/index.php?topic=706302.msg8868719#msg8868719

He mentioned high end air cooler or basic 120mm watercooler. I pointed out a dual 120mm closed loop cooler could do up to 300w but would love to see his unicorn air cooler.. Somehow he thinks quoting me as If I can't read and chose to not post this unicorn cooler and insult me instead, of course because we all know typing 3 words is easier than 30

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.

The parameters that define how much a heat a cooler can dissipate are the ambient room temperatures, amount of surface area on heatsink, the metals used, the type of contact of these metals, and the ability to move air through that cooler to dissipate the heat. There is a reason two coolers with the same surface area and different amount of heatpipes can perform different than each other.
Also, those numbers you pulled can easily be thrown away by searching for proper reviews done on the internet by credited and reputable people such as http://martinsliquidlab.org/