PSU missing 12v 4-pin connector 4 CPU power supply

[TJ Sackville-West]

Suggestions please to rig power for the square 4-pin 12v connection,
missing from the cabling from a CODEGEN 250X-1 250W PSU

Have an MSI KM3M-V mATX board which has the square JPW1 (4-pin 12v)
connector to power the CPU. 2x GND & 2x 12v pins showing.

I don't know why this ATX PSU unit which is only 4-5 years old doesn't
have the square pin for the CPU power supply. Maybe is too old and the
new generation of CPU need direct higher power supply that the 20-pin
socket can provide, but I'm only putting on a Sempron 2400 so I should
be able to tap off 12V from somewhere and run it in with the correct
male fitting.

Thanks
TJ

 

[Wes Newell]

Suggestions please to rig power for the square 4-pin 12v connection,
missing from the cabling from a CODEGEN 250X-1 250W PSU

Get an adapter cable from Molex to the 12v connector.

Have an MSI KM3M-V mATX board which has the square JPW1 (4-pin 12v)
connector to power the CPU. 2x GND & 2x 12v pins showing.

I don't know why this ATX PSU unit which is only 4-5 years old doesn't
have the square pin for the CPU power supply. Maybe is too old and the
new generation of CPU need direct higher power supply that the 20-pin
socket can provide, but I'm only putting on a Sempron 2400 so I should
be able to tap off 12V from somewhere and run it in with the correct
male fitting.

The 4 pin 12v connector was introduced with the P4, after your PSu was
built. BTW, AMD recommends a 300W PSU minimum for the K7 line. But I've
run a couple on 250W nits.

 

[Adam]

The 4 pin 12v connector was introduced with the P4, after your PSu was
built. BTW, AMD recommends a 300W PSU minimum for the K7 line. But I've
run a couple on 250W nits.

I was under the impression that the additional connector not only
provided more power but isolated power and ground planes for the CPU.

--adam

 

[Noozer]

Suggestions please to rig power for the square 4-pin 12v connection,
missing from the cabling from a CODEGEN 250X-1 250W PSU

I don't know why this ATX PSU unit which is only 4-5 years old doesn't

Mr Troll... 4-5 years makes it an antique as computer parts go.

If it is a 250watt PSU then it won't have enough juice to run the system
anyhow.

If you want a modern computer, bite the bullet and buy a modern PSU.

 

[kony]

I was under the impression that the additional connector not only
provided more power but isolated power and ground planes for the CPU.

--adam

I don't think it isolates ground and power might depend on
the board. Some past boards would potentially run, albeit
with the potential for instability, with only the 20-pin
connector attached. Other boards won't, definitely must
have 12 in at the 4 pin connector.

 

[kony]

Suggestions please to rig power for the square 4-pin 12v connection,
missing from the cabling from a CODEGEN 250X-1 250W PSU

Have an MSI KM3M-V mATX board which has the square JPW1 (4-pin 12v)
connector to power the CPU. 2x GND & 2x 12v pins showing.

I don't know why this ATX PSU unit which is only 4-5 years old doesn't
have the square pin for the CPU power supply. Maybe is too old and the
new generation of CPU need direct higher power supply that the 20-pin
socket can provide, but I'm only putting on a Sempron 2400 so I should
be able to tap off 12V from somewhere and run it in with the correct
male fitting.

Thanks
TJ

A 4-5 year old Codgen 250W isn't suited for this system.
Granted a Sempron 2400 isn't as demanding as some, but the
age of the PSU combined with it's generic low-quality
nature, lower capacity to begin with not even considering
that it may be optimized for amperage mostly from the 5V
rail, not 12V rail, might be too much for the old Codegen
which wasn't a very good PSU even when used in systems
contemporary at the time.

You can get an adapter that plugs into a 4 pin molex
connector but you'd be better off getting a new ~ 350W
name-brand power supply.

 

[Wes Newell]

I was under the impression that the additional connector not only
provided more power but isolated power and ground planes for the CPU.

What the board does with it depends on the board, but as far as the PSU is
concerned, it's just another 12v line coming from the same place as the
other 12v lines. Having the extra cinnector makes sure there's enough
copper for the load of the CPU.

 

[kony]

What the board does with it depends on the board, but as far as the PSU is
concerned, it's just another 12v line coming from the same place as the
other 12v lines. Having the extra cinnector makes sure there's enough
copper for the load of the CPU.

True it's often just another lead from the same 12V rail
(ignoring newer split-rail designs) BUT with the switch to
ATX 2.03 some may also have shifted to more 12V current
bias. In other words, typical 200-250W PSU bought today
might be much more suitable for powering a (12V based VRM
circuit) than an old PSU.

Granted the label is "supposed" to help guide on in these
choices but then we're back to the same timless argument
about whether one can trust the label on any particular
generic power supply.

 

[TJ]

Thanks for the advice.I bought a 400W PSU. Started up OK first time

- Tuff Test lite shows all VGA OK - only problem is Windows 98 won't
boot from the drive I had before.

Tried another HDD and that won't boot either.

Even tried booting from the CD ROM to install Sus Linux 9 and that
seemed to go into a void too

Is there some kind of a test probgam I can download to run from either
CD or floppie to check the board in DOS?

Thanks

TJ

 

[Trent©]

Thanks for the advice.I bought a 400W PSU. Started up OK first time

- Tuff Test lite shows all VGA OK - only problem is Windows 98 won't
boot from the drive I had before.

Tried another HDD and that won't boot either.

Even tried booting from the CD ROM to install Sus Linux 9 and that
seemed to go into a void too

Is there some kind of a test probgam I can download to run from either
CD or floppie to check the board in DOS?

Thanks

TJ

Did you try booting into the BIOS?...or a 98 rescue disk? Check your
boot options in the BIOS.


Have a nice one...

Trent©

Follow Joan Rivers' example --- get pre-embalmed!