P4S533-MXL in a case w/o the ATX12V connector ?

[Arifi Koseoglu]

Hello again, people.

I wonder whether it would be possible to install the P4S533-MXL in an
older ATX case without an extra 12V ATX 4-pin connector. Currently
this case is housing a P4B without any problems (the P4B does not need
the extra 12V connctor since ASUS cleverly put a regular HDD-style
connector on it to which I connected one of the 12V power lines
available in the case). I have to switch boxes due to some noise
problems.

I am thinking that using a proper cable adapter I can connect one of
the 12V lines to the ATX12V connector on the P4S533 using the same
logic as in P4B. Actually would this none be true for any motherboard?

The CPU will be a Celeron 2000 and RAM type is PC-133 SDRAM.

I have read on the HwB
(http://www.hwb.acc.umu.se/connector/power/atx12v.html) that one of
the pins is actually 3.3V. If this is the case and that 3.3V is really
used, than how is ASUS' solution on the P4B working which only sports
12Vs?

Thanks in advance,
Arifi

 

[Paul]

Hello again, people.

I wonder whether it would be possible to install the P4S533-MXL in an
older ATX case without an extra 12V ATX 4-pin connector. Currently
this case is housing a P4B without any problems (the P4B does not need
the extra 12V connctor since ASUS cleverly put a regular HDD-style
connector on it to which I connected one of the 12V power lines
available in the case). I have to switch boxes due to some noise
problems.

I am thinking that using a proper cable adapter I can connect one of
the 12V lines to the ATX12V connector on the P4S533 using the same
logic as in P4B. Actually would this none be true for any motherboard?

The CPU will be a Celeron 2000 and RAM type is PC-133 SDRAM.

I have read on the HwB
(http://www.hwb.acc.umu.se/connector/power/atx12v.html) that one of
the pins is actually 3.3V. If this is the case and that 3.3V is really
used, than how is ASUS' solution on the P4B working which only sports
12Vs?

Thanks in advance,
Arifi

This Celeron is listed as 52.8 Watts

http://processorfinder.intel.com/sc...Fam=49&PkgType=ALL&SysBusSpd=5095&CorSpd=5900

Doing the math, 52.8W/12V * (1.25 Vcore conversion efficiency) = 5.5 amps

The single 12V pin on the ATX20 pin connector is rated for 6 amps max.
The power for the fans and any other +12V circuitry is also coming
through that single pin. So, I would say you would be close to the
acceptable limit by using only the ATX20 pin connector.

This is a DIY solution I posted a while back - the 2x2 connector and
pins can be found on the digikey.com site.

**********
http://www.formfactors.org/developer/specs/atx/atx2_1.pdf (pg.19)

says the part that plugs into the motherboard is Molex 39-01-2040.

You will need four female pins to go with it. Molex 39-00-0039 tin
plated female pins (WM2501-ND) are available 10 for $0.90 at
Digikey.com (Tin plated to match the tin plated pins on the
motherboard.)

Next, buy yourself two of those disk drive Y-shaped splitter cables.
This will give you two connectors that can go to a disk drive plugs
on the power supply, plus it already has some wire on it.

The disk drive cable has +12,Gnd,Gnd,+5. You only want the +12 and
adjacent GND wire from the drive cable. The standard color scheme
is +12V is yellow, GND is black, and +5 is red.

Strip the end of the yellow and one black wire from each drive
connector. Crimp the end of the Molex pin over each wire. Then,
push the Molex pin and wire into the plastic 39-01-2040 body.

+12v (yellow)----------------------
GND (black) -------------- |
GND (black) | |
+5V (red) GND +12 <--- 39-01-2040 + 4*39-00-0039
GND +12
| |
+5V (red) | |
GND (black) | |
GND (black)--------------- |
+12v (yellow)----------------------|

Plug the two drive connectors into two separate and unused disk drive
power cables. Voila - instant ATX12V.

**********

Buying a new power supply would be so much easier

HTH,
Paul

 

[Arifi Koseoglu]

Strip the end of the yellow and one black wire from each drive
connector. Crimp the end of the Molex pin over each wire. Then,
push the Molex pin and wire into the plastic 39-01-2040 body.

+12v (yellow)----------------------
GND (black) -------------- |
GND (black) | |
+5V (red) GND +12 <--- 39-01-2040 + 4*39-00-0039
GND +12
| |
+5V (red) | |
GND (black) | |
GND (black)--------------- |
+12v (yellow)----------------------|

Plug the two drive connectors into two separate and unused disk drive
power cables. Voila - instant ATX12V.

Dear Paul,

First of all many thanks for the great info! One question:

Plug the two drive connectors into two separate and unused disk drive
power cables. Voila - instant ATX12V.

Do I have to use *two* HDD power lines? would one not suffice if I
"splitted" one 12V and ground li obtaning:

+12v (yellow)----------------------
GND (black) -------------- |
GND (black) | |
+5V (red) ---GND +12 --- | |
---GND +12 ---

Best,
Arifi

 

[Paul]

(e-mail address removed) (Paul) wrote in message

[snip snip]

Strip the end of the yellow and one black wire from each drive
connector. Crimp the end of the Molex pin over each wire. Then,
push the Molex pin and wire into the plastic 39-01-2040 body.

+12v (yellow)----------------------
GND (black) -------------- |
GND (black) | |
+5V (red) GND +12 <--- 39-01-2040 + 4*39-00-0039
GND +12
| |
+5V (red) | |
GND (black) | |
GND (black)--------------- |
+12v (yellow)----------------------|

Plug the two drive connectors into two separate and unused disk drive
power cables. Voila - instant ATX12V.

Dear Paul,

First of all many thanks for the great info! One question:

Plug the two drive connectors into two separate and unused disk drive
power cables. Voila - instant ATX12V.

Do I have to use *two* HDD power lines? would one not suffice if I
"splitted" one 12V and ground li obtaning:

+12v (yellow)----------------------
GND (black) -------------- |
GND (black) | |
+5V (red) ---GND +12 --- | |
---GND +12 ---

Best,
Arifi

I drew the solution that way, to preserve the amperage ratings of all
the pins on the new cable adapter (i.e. one disk drive power pin feeds
one pin on the 2x2 connector). Your solution would be the equivalent
of the Asus EZplug, so I wouldn't expect any problems in most cases.

I have a theory that there are some motherboards that draw all the
processor power from the 2x2 connector, in which case using two
disk drive leads as a source of power would be a good idea. This
observation is based on some people saying their system won't POST
unless the 2x2 is connected. By drawing the solution the way I did,
I am covering the possibility of all processor power coming through
this adapter.

Paul