power connectors for mainboards

[ron minnich]

I have four K7SEMs which I would like to run from one PC power supply.

Does anyone know if there are off-the-shelf cables available to do this 
type of thing? Essentially a "Y" connector for the mainboard power 
connector.

ron

[Vincent Touquet]

On Fri, Jun 20, 2003 at 08:40:18AM -0600, ron minnich wrote:
> I have four K7SEMs which I would like to run from one PC power supply. 
> Does anyone know if there are off-the-shelf cables available to do this 
> type of thing? Essentially a "Y" connector for the mainboard power 
> connector.

I don't think the power supply can handle four  K7SEMs,
they are designed for one ...

I would advise against doing this.
I wouldn't know where to get an Y connector like that.

v

[ron minnich]

On Fri, 20 Jun 2003, Vincent Touquet wrote:
> I would advise against doing this.
> I wouldn't know where to get an Y connector like that.

ok, that's good to know.

Now I need to find four cheap, compact power supplies :-)

no disk in this system, no cdrom, no nothing save for motherboards. I'm 
looking for small, cheap, good supplies. Probably don't exist but anybody 
know for sure?

ron

[Vincent Touquet]

On Fri, Jun 20, 2003 at 09:06:07AM -0600, ron minnich wrote:
> ok, that's good to know. 
> Now I need to find four cheap, compact power supplies :-)

:)
> no disk in this system, no cdrom, no nothing save for motherboards. I'm 
> looking for small, cheap, good supplies. Probably don't exist but anybody 
> know for sure?

I don't know for sure what the requirements are for the K7SEM,
but I think any 350W supply would do. Don't think you can go
any lower than that (if it were an MP board, you would need
a 450 W supply).

Shop around :)

v

[Vincent Touquet]

On Fri, Jun 20, 2003 at 05:10:01PM +0200, Vincent Touquet wrote:
> > looking for small, cheap, good supplies. Probably don't exist but anybody 
> > know for sure?
>
> but I think any 350W supply would do. Don't think you can go

Any is an over statement of course, make sure the connectors match :)
Sometimes the connectors even change during the life cycle of one
and the same boardname.

v

[Steve Gehlbach]

ron minnich wrote:
> Now I need to find four cheap, compact power supplies :-)

Maybe buy.com:

http://www.buy.com/retail/product.asp?sku=10254765&hdwt=0&loc=101

I would carefully check the mobo current requirements; you might get 
away with one of the tiny ones:

http://www.buy.com/retail/product.asp?sku=10272555&hdwt=0&loc=101

But it would be necessary to compare specs, startech web site says
DC OUTPUT:
     * +3.3(8A)
     * +5V(14A)
     * +12V(5.5A)
     * -12V(0.3A)
     * +5VSB(1A)

But the bottom line sometimes is you have to try it, since surge 
currents on startup can cause the supply to trip even though it can 
handle the steady load.

-Steve

[Adam Sulmicki]

> > I would advise against doing this.
> > I wouldn't know where to get an Y connector like that.
>
> ok, that's good to know.
>
> Now I need to find four cheap, compact power supplies :-)
>
> no disk in this system, no cdrom, no nothing save for motherboards. I'm
> looking for small, cheap, good supplies. Probably don't exist but anybody
> know for sure?

Maybe try one of those 1U power supplies.
Similar to the one I had with me during USENIX
Something like:

http://www.gtweb.net/ps-1u.html

and the power supply in action:

http://www.eax.com/usenix03/image/101_0138.JPG

http://www.eax.com/usenix03/

It should be fairly easy to stack 4 of them side by side and tie together.

[Brian G. Rhodes]

Ron,

How about 4 of these...

http://www.seanm.ca/eden/psu.html

Or if that's not enough power for the processor, sparkle (great name)
makes some 150W powersupplies which are 1U and smaller than average 1U
power supplies.

FSP150-50PL is the model I have been using for pIII rackmount systems.

Their website is www.sparklepower.com.

Brian G Rhodes
[e-mail]
[e-mail]
[phone]

On Fri, 20 Jun 2003, Adam Sulmicki wrote:
> > > I would advise against doing this.
> > > I wouldn't know where to get an Y connector like that.
> >
> > ok, that's good to know.
> >
> > Now I need to find four cheap, compact power supplies :-)
> >
> > no disk in this system, no cdrom, no nothing save for motherboards. I'm
> > looking for small, cheap, good supplies. Probably don't exist but anybody
> > know for sure?
>
> Maybe try one of those 1U power supplies.
> Similar to the one I had with me during USENIX
> Something like:
>
> http://www.gtweb.net/ps-1u.html
>
> and the power supply in action:
>
> http://www.eax.com/usenix03/image/101_0138.JPG
>
> http://www.eax.com/usenix03/
>
> It should be fairly easy to stack 4 of them side by side and tie together.
>
> Linuxbios mailing list
> [e-mail]
> http://www.clustermatic.org/mailman/listinfo/linuxbios

[ron minnich]

I need something that comes in at ca. $25 ...

ron

[Jeremy Jackson]

ron minnich wrote:
> I need something that comes in at ca. $25 ...

Perhaps a high end 450W power supply (cost divided by 4) with a custom 
"Y" cable from a cable maker.  In quantity the cables might be cheap 
enough.  Someone will have to calculate a power budget for each voltage. 
  It would be best to also measure an actual system's current draw on 
each rail, under  full load to verify.  You would probably require 
several hundred (4 board) systems to justify the initial design costs.

Jeremy

[Richard Smith]

ron minnich wrote:
> > I would advise against doing this.
> > I wouldn't know where to get an Y connector like that.

Ditto.  Just a couple of days ago we had this new nifty 2Ghz Athlon 
motherboard that wouldn't boot beacuse the 350W powersupply we had 
connected to it didn't have enough juice on the 3.3V rail.  AMD white 
paper claims that the power supply must be able to provide peak CPU draw 
  for 10 seconds at boot.  These new processors need lots of juice when 
they startup.  You would need a pretty hoss supply to boot 4 cpus at once.
> Now I need to find four cheap, compact power supplies :-)
> no disk in this system, no cdrom, no nothing save for motherboards. I'm

What CPU is it and how much current does it need on the rails?  You 
might be able to get by with some of those Mini-ATX supplys.  They are 
small and cheap but pretty thin on wattage.

[ron minnich]

On Fri, 20 Jun 2003, Richard Smith wrote:
> What CPU is it and how much current does it need on the rails?

Duron 1300

The one supply I found from Sparkle was $155!

ron

[Adam Agnew]

These appear to be some small, dirt cheap supplies. Not 100% sure a
FlexATX power supply uses the same standard ATX power connector, but i
suspect it does.

http://www.aaronix.com/catalog/default.php/cPath/131_132

On Fri, 20 Jun 2003, ron minnich wrote:
> On Fri, 20 Jun 2003, Richard Smith wrote:
> > What CPU is it and how much current does it need on the rails?
>
> Duron 1300
>
> The one supply I found from Sparkle was $155!
>
> ron
>
> Linuxbios mailing list
> [e-mail]
> http://www.clustermatic.org/mailman/listinfo/linuxbios

[Bari Ari]

ron minnich wrote:
> The one supply I found from Sparkle was $155!

$9 - $16  350W - 550W
http://www.str8buy.com/powersupplyups.html

250W Sparkle  $11, 350W Powmax $15
http://3btech.net/cases2.html

-Bari

[Richard Smith]

ron minnich wrote:
> > What CPU is it and how much current does it need on the rails?
> Duron 1300

Looks like a 1300 needs a little over 60 watts peak.  So if one of those 
  70 watt micro ATX supplys can do 19 amps on the 3.3V rail it might 
work.  Depnds on how much juice the northbridge needs.

[Bari Ari]

ron minnich wrote:
> Now I need to find four cheap, compact power supplies :-)
>
> no disk in this system, no cdrom, no nothing save for motherboards. I'm 
> looking for small, cheap, good supplies. Probably don't exist but anybody 
> know for sure?

Take a look at

http://www.sparklepower.com/

They tend to run in the $10 -$15 ea range.

-Bari

Re[2]: power connectors for mainboards

[Alexander Amelkin]

Hello Ron!

Friday, June 20, 2003, 7:06:07 PM, you wrote:

rm> Now I need to find four cheap, compact power supplies :-)

rm> no disk in this system, no cdrom, no nothing save for motherboards. I'm 
rm> looking for small, cheap, good supplies. Probably don't exist but anybody 
rm> know for sure?

I'd go for In-Win (Powerman) power supplies. They go for about US$15-20
here in Russia. The best supplies and the best cases too, IMHO. Check
your local In-Win dealer for availability and prices. See
http://www.in-win.com.tw/home/english/power_supply.htm or just
www.in-win.com

With best regards,
Alexander  mailto:[e-mail]

[Bari Ari]

ron minnich wrote:
> I have four K7SEMs which I would like to run from one PC power supply.
>
> Does anyone know if there are off-the-shelf cables available to do this 
> type of thing? Essentially a "Y" connector for the mainboard power 
> connector.

I've never seen any for ATX power supplies since you'd have to deal with 
a couple control signals.

ATX supply has a PWR_OK ouput and also PS_ON# input.

"PWR_OK is a “power good” signal. It should be asserted high by the 
power supply to
indicate that the +12 VDC, +5VDC, and +3.3VDC outputs are above the 
undervoltage
thresholds. Conversely, PWR_OK should be de-asserted
to a low state when any of the +12 VDC, +5 VDC, or +3.3 VDC output voltages
falls below its undervoltage threshold, or when mains power has been 
removed for a time
sufficiently long such that power supply operation cannot be guaranteed 
beyond the power-down
warning time."

"PS_ON# is an active-low, TTL-compatible signal that allows a 
motherboard to remotely
control the power supply in conjunction with features such as soft 
on/off, Wake on LAN † ,
or wake-on-modem. When PS_ON# is pulled to TTL low, the power supply 
should turn on
the five main DC output rails: +12VDC, +5VDC, +3.3VDC, -5VDC, and 
-12VDC. When
PS_ON# is pulled to TTL high or open-circuited, the DC output rails 
should not deliver
current and should be held at zero potential with respect to ground. 
PS_ON# has no effect
on the +5VSB output, which is always enabled whenever the AC power is 
present.
The power supply shall provide an internal pull-up to TTL high. The 
power supply shall
also provide debounce circuitry on PS_ON# to prevent it from oscillating 
on/off at startup
when activated by a mechanical switch. The DC output enable circuitry 
must be SELV-compliant.
The power supply shall not latch into a shutdown state when PS_ON# is 
driven active by
pulses between 10ms to 100ms during the decay of the power rails."

PS_ON# could just be pulled low with a jumper or switch to ground if you 
didn't care about power control by the motherboard since the ATX supply 
would be always on.

-Bari

[Justin Cormack]

On Fri, 2003-06-20 at 15:40, ron minnich wrote:
> I have four K7SEMs which I would like to run from one PC power supply.
>
> Does anyone know if there are off-the-shelf cables available to do this 
> type of thing? Essentially a "Y" connector for the mainboard power 
> connector.

Sun Power (www.sunpower.com) will make up power supplies with custom
connectors (extremely quickly). You could ask them to make one up with 4
ATX connectors on (modulo sorting out the power on lines). Their PSUs
are pretty good, I reckon you might get away with 600W for 4 Durons,
maybe a little more.

Justin

[ron minnich]

On 22 Jun 2003, Justin Cormack wrote:
> Sun Power (www.sunpower.com) will make up power supplies with custom

I think that's the wrong URL? get's me some technology company with 
refrigeration or something.

ron

[ron minnich]

On 22 Jun 2003, Justin Cormack wrote:
> Sun Power (www.sunpower.com) will make up power supplies with custom

ah.

sunpower.com.tw

ron