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-   -   Intel Xeon PHI? (https://www.mersenneforum.org/showthread.php?t=25767)

ewmayer 2020-07-26 00:00

Mike just reminded me that Phi copros are passively cooled, so one would need some serious external-fan-air to cool them. Or, [url=https://www.allied-control.com/xeon-phi-immersion-cooling-concept/]one could go high-tech[/url]. :)

kruoli 2020-07-26 12:38

I bought a 31S1P four and a half years ago (52,21 €, including shipping and VAT, new). I do not know why it was so extremely cheap at that time. I'll might be able to get two more of them from former fellow students, which also bought some.

The Solution to the fan problem was a 3D printed adapter for fans on one end. The ones I used originally were to slow so upgraded them later on. The 3D model was taken from thingify without edits. A video of my build is visible on YouTube:
[YOUTUBE]9qpGcjhf7dM[/YOUTUBE]

VBCurtis 2020-07-26 14:58

[QUOTE=kruoli;551641]I bought a 31S1P four and a half years ago (52,21 €, including shipping and VAT, new). [/QUOTE]

What have you run on it?

kruoli 2020-07-26 15:26

For my student job at the university I was given the task to vectorize a given program that simulated diffraction. It was required to run best on CPUs and should run using OpenCL. I had some of that running on it, also, but without OpenCL. The only problem was that each thread required quite large amounts of memory when you were simulating longer time durations, so it was not well suited for that card.

Later on I implemented a generator for [URL="http://mathcs.clarku.edu/~djoyce/mpst/surprising/"]surprising strings[/URL] and tried multiple things to optimize my code on that. After two months or so I dismounted the machine and never used the card again, since.

Aside from minor things I never used the card nearly to its potential. So when I saw this thread, I liked the idea of reviving the card.

ewmayer 2020-07-26 22:01

1 Attachment(s)
[QUOTE=kruoli;551641]The Solution to the fan problem was a 3D printed adapter for fans on one end. The ones I used originally were to slow so upgraded them later on. The 3D model was taken from thingify without edits.[/QUOTE]

For my recent 3 x Radeon7 open test-frame build, once I housed the completed beast at back of my desk under an open-sided glass-top monitor stand (which I jury-rigged to double the original 4" max adjustable-leg height, even with free airflow from the front and sides the R7s were throttling big-time (and they were downclocked to the Linux/ROCm sclk = 3 setting, which translates to ~150W per card). My solution was to buy a compact corded (= serious airflow, none of this wimpy-ass USB-fan crap) desktop fan which I placed at left edge of monitor stand to blast air across the machine - see pic below. That gave good enough airflow that the GPU at the left end, the one closest to fan whose triple-air-intake gets air directly from the desktop fan, doesn't even need its own fans - even at the higher sclk=4 (200W) setting, its fan are basically idling. One could do a similar build with a Xeon Phi card in that location, except I don't know if the Phi's airflow needs would be met with the same kind of positioning - based on the PCI-bus location is eBay seller pics, replacing the leftmost R7 in my pic with a Phi would put the blue decorative top plate facing the fan - is that designed to dissipate processor heat or not? How about air hitting the circuit-board-revealing bottom face of the Phi at a right angle?

kriesel 2020-07-27 00:10

I have a large-room air purifier (HEPA filter) blowing its exhaust at my Radeons.

kruoli 2020-07-27 08:23

Unfortunately, the 31S1P is only open on the two smallest sides. Even my setup with the two 40mm fans (found the [URL="http://www.thingiverse.com/thing:997213"]link[/URL] again) was not enough for continuous full blast calculations. I have not tried to open up the metal housing, maybe one could cool it better that way. Now, since I'm out of warranty, I'll might try that.

kriesel 2020-07-27 15:42

[QUOTE=kruoli;551718]Unfortunately, the 31S1P is only open on the two smallest sides. Even my setup with the two 40mm fans (found the [URL="http://www.thingiverse.com/thing:997213"]link[/URL] again) was not enough for continuous full blast calculations. I have not tried to open up the metal housing, maybe one could cool it better that way. Now, since I'm out of warranty, I'll might try that.[/QUOTE]Either that or shop around for some high static pressure blowers.

ewmayer 2020-07-27 22:23

[QUOTE=kruoli;551718]Unfortunately, the 31S1P is only open on the two smallest sides. Even my setup with the two 40mm fans (found the [URL="http://www.thingiverse.com/thing:997213"]link[/URL] again) was not enough for continuous full blast calculations. I have not tried to open up the metal housing, maybe one could cool it better that way. Now, since I'm out of warranty, I'll might try that.[/QUOTE]

Re. open the housing - That was my next question. :) Looking at the eBay seller's pic, looks like you simply need to remove a couple easily-accessible screws at each corner to pull the blue-plate-special part of the housing off.

LaurV 2020-07-28 02:21

[QUOTE=kruoli;551641]I bought a 31S1P ...[/QUOTE]
We fixed your youtube tag, see the reason in the post.

kruoli 2020-07-28 08:19

[QUOTE=ewmayer;551748]Re. open the housing - That was my next question. :)[/QUOTE]

I'm going forward to do this this week and report on it here.

[QUOTE=LaurV;551763]We fixed your youtube tag, see the reason in the post.[/QUOTE]

Oops... Thank you! :smile:


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