Re: [Beowulf] AMD Roadrunner open compute motherboard

2013-01-18 Thread Greg Lindahl
On Fri, Jan 18, 2013 at 03:00:11PM -0500, Mark Hahn wrote: > > As in contradiction to what Mark Hahn says - it needs active cooling. > > if anyone cares: a dimm dissipates roughly 2W, depending on generation, > whether it's LV, number of devices, etc. one of those duplex 14krpm fans > is typical

Re: [Beowulf] AMD Roadrunner open compute motherboard

2013-01-18 Thread Greg Lindahl
On Fri, Jan 18, 2013 at 11:39:23PM +, Lux, Jim (337C) wrote: > they're putting them next to power plants so power costs are low and near > toxic waste dumps or swamps or something where land is cheap). In the Silicon Valley, we build office parks and apartments on waste dumps and swamps, and

Re: [Beowulf] AMD Roadrunner open compute motherboard

2013-01-18 Thread Lux, Jim (337C)
What's interesting is how much power the fan consumes.. Sunon SG4028 is a 40x40mm fan 28 mm long (single fan). The 16.8 CFM flavor spins at 13krpm and consumes 2.6 watts. The PF4056 which is a stack of two fans 40x0mm, at 15-18krpm consumes almost 11W to push 27 CFM ( at zero back pressure..)

Re: [Beowulf] AMD Roadrunner open compute motherboard

2013-01-18 Thread Lux, Jim (337C)
I think the idea behind OCP is to be pretty conventional and pedestrian.. They weld the "rack" enclosure out of 2" square steel tubing. Their model isn't to get the highest performance in the densest area, but rather, the lowest cost per performance. The kind of thing where you can hand the fa

Re: [Beowulf] AMD Roadrunner open compute motherboard

2013-01-18 Thread Mark Hahn
> As in contradiction to what Mark Hahn says - it needs active cooling. if anyone cares: a dimm dissipates roughly 2W, depending on generation, whether it's LV, number of devices, etc. one of those duplex 14krpm fans is typically rated at about 12W. in a mainstream server, each CPU will dissipa

Re: [Beowulf] AMD Roadrunner open compute motherboard

2013-01-18 Thread Vincent Diepeveen
Yes i wondered about that inch or so between it. So it spreads the air also to the dimms. That's very good :) As in contradiction to what Mark Hahn says - it needs active cooling. Could you sell some of them? I wouldn't be interested in a 2 socket AMD except when it's for a price you sure do

Re: [Beowulf] AMD Roadrunner open compute motherboard

2013-01-18 Thread Arend Dittmer
> > Are the 12 dimms on the right side of the picture getting any cooling at > all? Yes, they are. There are baffles between the fans and the motherboard to shift air to flow through the memory DIMM's. The fans are shifted to the side so that there is room to mount a RAID controller battery in