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Dell power supply to standard atx mobo

B

batorok

Senior member
follow up question:
Anyone tried to get the dell power/reset/hdd led connector to work with a standard atx mobo?

Hi,
I searched and couldn't find anything, so here goes.
I have a dell 8250 2.4 p4 machine, with a nice c1 stepping cpu, and wanted to swap out the crap mobo and put in a ddr overclocking board. However, the power supply connector that looks like a standard atx connector has one pin that is not connected, it's pin 18, which is usually a +5volt lead.

Does anyone know how to put a +5v lead into one of these pins and get a standard board to work? I realize I'll lose the useless front usb and sound port, but the idea of getting my 2.4 up to 3.0 ghz or so, and getting rid of the rdram for some much cheaper ddr is very appealing...

comparing dell to a standard atx connector:
PIN Dell ATX
1 +3.3 +3.3
2 +3.3 +3.3
3 com gnd
4 +5.0 +5.0
5 com gnd
6 +5.0 +5.0
7 com gnd
8 powerok powerok
9 +5 vfp +5vsb **************************
10 +12 +12
11 +3.3 sense connecor/+3.3 ************************
12 +-12v -12v
13 com gnd
14 ps on ps on
15 com gmd
16 com gnd
17 com gnd
18 N/C +5v *******************************
19 +5v +5v
20 +5v +5v

the ************* are differences, I think only in terminology except pin 18.

Anyone who's put in a new mobo with this connector please pm me. I"m guessing I can just pull a +5v connector from a drive lead and plug it in lead 18, but I'm also wondering if I could splice one of the otehr 5v leads into lead 18. (This may be totally stupid, I can't recall my basic circuitry).

THANKS! for any help in advance

EDIT: SEE MY POST FOR A LINK TO THE LATEST ATX 1.2 SPEC, its the same as my dell, dude! rambus out, ddr in!
 
I suggest getting a new standard-ATX case and power supply, such as an Antec Plus660AMG (nice dark-charcoal color, should work well with your drives) to go with your new motherboard.
 
Also be aware that you'll probably have to rewire your connector for the HD/PWR lights and PWR/reset switches if you stick with the Dell case.....
 
good point about the power button, I could care less about the leds.
I'm not too excited about dumping another 100$ for a new case/ps, especially when the dell one is so slick to work on and QUIET! And the rewire seems pretty simple, just wanted to see if someone else had done it...

 
If you do re-wire, may I suggest testing your work with the hard drive(s) and other drives disconnected from the PSU and motherboard, the first time.
 
Originally posted by: batorok
good point about the power button, I could care less about the leds.
I'm not too excited about dumping another 100$ for a new case/ps, especially when the dell one is so slick to work on and QUIET! And the rewire seems pretty simple, just wanted to see if someone else had done it...
Click to expand...

then dont dump it. 8250 has a 850E board and you're gonna be hardpressed to find a better performing unless you got Canterwood.
 
I think an 845pe ddr board overclocking my cpu to 3ghz will be faster than the stock 2.4 speed on the 850e, plus I can actually afford more than the 256mb of ram I currently have if I go with ddr, and the 865 board are available now at newegg which I'm guessing will be at least as fast as the 850e. We'll see soon, I hope, from anand..
 
Pin 18 is for -5v, negative 5v, and is optional on the latest atx spec. You won't need it on any late model board. Check it out at www.formfactors. org.

Dell has used non-standard wiring at times in the past, although the color coding has been the same, iirc. You seem to confirm the rumor that p4 dells use a standard atx plug, a good thing.
 
I suspect that you could trace the wires, then split the plug into single or paired wires as required, or just tease the terminal sockets out of the plug using a pin, maybe cover the bare metal with some heatshrink before plugging onto the board.
 
I'll try to post what's there to remove/splice this weekend, I'm at work now. I recall only 5 wires going into the motherboard, and dell seems to use only one switch for power/reset/standby. I'm not sure how I would get the five leads from the dell into the power/reset/hdd leads on a standard atx board, maybe it's just all one ground and 4 wires for power/reset/hdd and? speaker? , I guess I need to dig out my multimeter and see what i can learn...
 
In all likelihood, your dell has a standard intel mobo. Look for the numbers on the board near the i/o panel, chase it down at the intel site, and you'll know the function of each wire...
 
I would be suprised if it's standard intel motherboard, but I can't check as I'm at work. The reason I'm doubtful is the USB 2.0 chips are via chips, I don't think intel would integrate those given they just recently settled the p4 bus licensing issue...

 
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