[Beowulf] Re: Beowulf of bare motherboards

[Glen Gardner]

You might try turning on one node at a time if you can.

You ought to try to run two nodes at full throttle on the same psu. I 
suspect you will run into more problems.
Install an OS on each computer and run something like a heapsort 
benchmark or linpack on both at the same time and see if you get  a crash.




Andrew Piskorski wrote:

>At Mark Hahn's suggestion, I checked the rated amperage on the +3.3
>volt line is for each supply.  That didn't seem to correlate with
>anything though, so I've recorded all the amps here:
>
>     Rated Amps for each line:
>     Volts: +3.3, +5, +12,  -5, -12, +5 Sb
>Nodes, PSU  ----  --  ---  ---  ---  -----
>2,   TTake:   30, 40,  18, 0.3, 0.8, 2.0
>3,     MGE:   20, 45,  24, 0.6, 0.6, 2.0
>3, Enermax:   28, 30,  22, 1.0, 1  , 2.2
>4, Sparkle:   14, 25,   8, 0.8, 0.8, 0.8
>
>The ratings on the -5 V line seem to line up pretty closely with my
>"how many motherboards can this supply power up" metric, but, the 20
>pin ATX power connector on the motherboard doesn't even HAVE a -5 V
>line, right?  Any thoughts on what the driving factor here could be?
>
>ThermalTake Purepower HPC-420-302 DF, Active PFC, 420 W
>+3.3 V:  30 A
>  http://www.newegg.com/app/ViewProductDesc.asp?description=17-153-005
>  http://www.newegg.com/app/viewProductDesc.asp?description=17-153-005R
>  $53 +$7 from newegg.com
>2 nodes, 175 W, PF 0.98,  $34.25 per node
>3 nodes, would not boot, [$25.67 per node]
>4 nodes, would not boot, [$21.38 per node]
>
>MGE SuperCharger, 600W
>+3.3 V:  20 A
>  http://www.newegg.com/app/viewProductDesc.asp?description=17-167-010
>  $48 +$7 from newegg.com
>2 nodes, 175 W, PF 0.66,  $31.75 per node
>3 nodes, 255 W, PF 0.67,  $24.00 per node
>4 nodes, would not boot, [$20.13 per node]
>
>Enermax EG301P-VB, 300 W
>+3.3 V:  28 A
>  http://www.newegg.com/app/viewProductDesc.asp?description=17-103-423
>  $31.50 +$7 from newegg.com
>2 nodes, 155 W, PF 0.67,  $23.50 per node
>3 nodes, 226 W, PF 0.68,  $18.50 per node
>4 nodes, would not boot, [$16.00 per node]
>
>Sparkle FSP250-61GT, 250 W
>+3.3 V:  14 A
>  Ancient, used to power my old AMD K6-II 380 MHz dektop.
>2 nodes, 170 W, PF 0.64
>3 nodes, 241 W, PF 0.64
>4 nodes, 331 W, PF 0.65
>
>  
>

-- 
Glen E. Gardner, Jr.
AA8C
AMSAT MEMBER 10593
Glen.Gardner at verizon.net


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