ATX to AT power adapter converter review with -5V
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- čas přidán 22. 08. 2024
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I remember using that type of adapter for my old 486/Pentium MMX PC when my AT PSU died on me, and I had a spare 520W ATX PSU on me, and the adapter was the key for me (saved a trip and money getting a new AT PSU). My Pentium PC has both an ATX and AT connections, and still powers on with the ATX PSU connected to it since the board detects the type of PSU without manually setting jumpers.
I used a Seasonic 450W fully modular PSU and a ATX to AT adapter with -5v and the dummy load to replace the old AT PSU that wanted to die on me on my 486 PC.
Any updated links to selling these? ebay ones are dead.
Same. Looking for one with the converter to get a -5v rail. Plenty of others without it on Aliexpress though.
It just occured to me that if your PSU does not have the -5v rail, you could get a simple DC to DC converter like this one : aliexpress.com/item/33034117996.html (pick the -5v "colour"). The only problem would be that these converters only output between 0.2A and 0.3A depending on the input voltage so it might not be enougth.
Are any of the ATX to AT adapters currently on ebay worth getting?
I am restoring my childhood 386sx system and am at this point considering one of these adapters, as the original psu is only delivering 10v on the 12v rail (5v rail is just fine) and I don't really have any knowledge of power supplies.
Since I cannot find the adaptor with the -5v stepdown converter (I think it takes -12v and steps that down) I am now considering the voltageblaster from you and NecroWare.
In case you are interested, it's a Highscreen Colani flat model.
Do you actually need -5V?
I have original exbox im trying to hook up to tax PC power supply does your adapt work with that
The ebay links don't work anymore.
An ATX PSU needs a load, the first adapter doesnt need to dummy load because the PSU is off until you press the button, the 2nd the PSU is live all the time its putting out power to the ATX 20 connector pins at all times so it needs a load.
There are a lot of videos on here about it all, please dont try and do this on the cheap it will kill your PSU and might take some of your old hardware with it... Just for the sake of a few extra pounds.
If you cant afford to buy these wait until you can afford them they are the best way to do it guys
Can you please expand a bit on this. I'm not sure I understand the dangers?
Im not sure how to expand on it.
The adapter cables do the same thing but in different ways. The second one pretends to be attach a modern motherboard to the PSU, the first one doesnt. it just outputs the current to the ATX 20 connector by jumping the signal with its push switch.
If you are going to get one of these adapters get the second one with the dummy load block on it, your PSU will last longer and output what you need (ie -5V rail)
Thanks for taking the time to answer!
I do understand the physical differences between them, but why is the dummy load good to have? What exactly is it accomplishing, and why will it make my PSU last longer?
jiddro33 - I've had power supply that won't turn on without load. But does turn on loaded.
Thank you man
Hello since the cable with the positive to negative voltage converter and load resistor are no longer available could you list the actual parts numbers ? -Thanks
The -5V are in the pin 2 of P8 right?
I have seen some datasheets that differes with that, some have n/c, others have +5V and others have -5V, i'm not quite sure and i dont want to burn my 486
Also i think the 20pin atx connector actually has -5V so there is no need for a dc/dc converter
The -5v rail was phased out of the ATX standard back around 2002, so now PSUs have nothing attached to that pin, hence the need for the converter.
I have an old ATX PSU that shows a -5v rail on the label, but when I measure it through my ATX-to-AT adapter (which does not have a voltage converter), it shows +5v on the -5 rail. Does this indicate a fault w/ the PSU or adapter? I assume it's not safe to use in this configuration, either way....?
The adapter without the voltage converter, just passes through voltages. Do you have the polarity correct, with the black cable going to GND and red cable going to 5 or -5?
@@philscomputerlab Thanks for the reply. Yes, I'm quite sure I had the polarity correct, since I was able to measure the -12v rail just fine, but both +5 and -5 show positive voltage. It's a Rosewill brand, so it could just be junk from the factory and why the only thing I've hooked up to it so far is a multimeter lol... Cheers.
Hey Phill.I have an IBM aptiva from 1995 and the old powersupply have 4 those old white pin connectors and those cables from ebay have only 2 for power.But i need one more into the board witch is in main motherboard.Can you maybe help or make a video?
I wish you had included the listing names in the description because trying to search for the version with -5v on ebay today is a nightmare. I had no idea what the convention is for naming these since -5v will remove the term 5v from your search instead of searching correctly.
Yea I don't think these adapters exist anymore...
@@philscomputerlab That would be very unfortunate. I wish there were more projects around to reintroduce -5v other than the voltage blaster. As nice as it is taking up a full ISA slot on a computer with just 2 ISA slots is a bit of an issue.
we need vogons or ppl outthere to create a project, so we can avoid old psu @@philscomputerlab
Great video...question though. I have a modern atx psu with no -5v. I want to use it on my asus pentium iI mobo that takes atx. However, the asus mobo wants -5v for the isa slots. How do you use a new atx psu with no -5v rail on a older atx mobo that needs -5v.
You might want to watch the video since it answers your question
@@jonas-fr time stamp please?
@@jonas-fr It seems you didn´t get his question right... some old _atx_ boards want -5V too (white cable in the atx wire harness) www.smpspowersupply.com/connector_atx_pinout.GIF
My Asus MB has the same issue, but i can switch the error message to "ignore" in the bios. You can always buy a step down converter and connect it to the white cable... (you need more details before actually doing it)
@@logipilot thanks! Your advice was exactly what I was looking for.
Hey Phil, I got myself a nice 386 board that was said to be working. I got an ISA VGA card and this adapter with a switch. When I press the switch, my power supply turns on but I dont have any display. I made sure to put the AT cables black to black like you said. I obviously don't have any spare parts to test. Do you have any thoughts on how I could narrow down the issue if it is the mother board or the video card? No fan headers or anything on the board that I can figure out to test to see if there is at least power going through the board.
Hmm that's a worry. Connect a PC speaker and maybe you hear any beeps? Cleaning the ISA connectors can sometimes help, but a 386 is pretty much set and forget in terms of setting it up, unlike 486, they can have a ton of jumpers to configure.
PhilsComputerLab Thanks, I will try the PC speaker. I did leave it on for a while and the IC’s on the board and the video card all got warm/hot so I think power is going through it. I did realize I have an old pentium board I can use to test the ISA card as well. (Assuming that board works, but I have lots of PCI cards to test the pentium board)
Where can I buy ATX to AT adapter with -5V support now? Ebay and Aliexpress shows no results.
AliExpress you havé to write atx to at
how do you choose ur atx powersupply instead?
old motherboards are +5v heavy while newer ones are +12v heavy. is it safe to use a 12v one with older boards? its just about the maximum amperage on each line?
Why are people actually afraid of using AT-PSUs? Because of their age or are they supposed to be of lower quality generally? In my 20+ years experience with PC hardware I never personally had an AT-PSU fail on me while I did with ATX-PSUs (powering ATX-hardware only).
+armorgeddon On Vogons many users had AT PSUs blow up and sometimes take other hardware with them and knock them out. Why risk it?
+philscomputerlab Don't get me wrong, I don't think it's bad in any way to use ATX-PSUs, I just wondered if those blown AT-PSUs had heavy mileage on them or if their bare age was enough to make them die?
True, but why risk it? One might have the experience to load test old PSUs, but I don't. I also don't have the skill to repair old PSUs, which is another option.
However StarTech still sells a new AT power supply: www.startech.com/Computer-Parts/PSUs/AT-Power-Supplies/
@@philscomputerlab any pc psu can blow up, regardless of age, usually when/if caps go bad (seen lots of atx psus with bulging/leaking caps!), any psu can usually be 'serviced'/'upgraded' ,, although i have one bitch of an at psu that just wont run to full output volts, cant find anything obviously wrong with it!
@@philscomputerlab unfortunately Startech discontinued their AT power supply. on amazon it says Currently Unavailable. We don't know if or when it will be back in stock. but the ATX version is still in stock, and it has -5v.
do you know where to find this -5v ones? looks like they are gone.
Its kind of weird that this simple thing sold out on ebay and the person that did these disappeared. Im sure there is a lot of demand for something like this, did you keep the contact of the seller? maybe he died?
Would any toggle switch work or do I need a special on/off switch with it? The one I bought didn't come with any power button.
Replying to my own comment - yes a cheap toggle switch works. i.ebayimg.com/images/g/-XEAAOSwhspcDEdj/s-l1600.jpg this is the one I got.
@ch282 heya, I just use a testbench unfortunately, so the switch is just dangling not attached to anywhere :)
If I use an older ATX PSU (one that provides -5v) I guess I can just use the cheaper adapter, right?? And it will still provide the proper -5v to the motherboard for ISA cards??
+Lvlaukwitz Yes, that is correct!
I found that some of the adapters have the -5V wires physically removed. In that case, you have to make the connections yourself. Otherwise, the -5V supply still won't reach your motherboard...
Is there anything else the -5 would be used for? Trying to get an old CNC machine running and can’t get an old AT supply fast enough
awe64 gold need -5v. isa sound card need it
Is there any reason to have a -5v on a 20 pin atx motherboard that doesn’t have any isa slots? I have an asus p3c-d dual pentium 3 motherboard rig I’m building and it has a 6 pin at aux connector the manual states 3 grounds, 2 +3v and one +5 volt on the 6 pin. I was going to get those from a sata connector. And on the 20 pin connector it shows -5v on the Pinout for the 20p connector. The board does use RDRAM too so idk if the ram possibly Utilizes the -5v. Bunch of parts currently in the mail still my plan was to just try it without a -5v and see if there are any issues. If there seem to be issues I’ll go ahead and try splicing in that dongle portion off the adapter with the -5v add on.
Yea I doubt you'll have any issue with a modern PSU with that board.
Phil we need your help! I can't seem to find one of these with the -5v anymore. Have you run into any issues running isa sound cards without -5v?
Only a few sound cards are affected. What card are you going to use?
Question: Does the YAMAHA YMF719E-S OPL3 16BIT ISA Sound Audio Card that you recommend need the -5V?
No it does not.
Hi I have a broken packard Bell Pentium 1 power suply no longer working if i used a corsair 450 watt modular power supply with one of those adaptors would it fix the computer, thanks
I doubt you care anymore seen as this is a year old but providing the voltage to the cpu rail is enough it should work fine.
I have a se-i440bx-2 with some kind of ISA modem with a speaker in it. Can I use a corsair CX500 on it?
If the board is ATX, then yes, any ATX PSU will work :)
Does a normal Sound Blaster 16 require -5V from the power supply?
No it does not. Cards affected are the Sound Blaster 2.0, Roland LAPC-I and Mediavision Pro Audio Spectrum 16.
PhilsComputerLab It's a good news...
I'm still suspecting whether the -5v has something to do with my abnormal K6-2...
How can I have -5v without a converter?
Older ATX 20pin power supplys have it. See ATX Power supply Pinout
where to find pin out ?
www.smpspowersupply.com/connector_atx_pinout.GIF
I decided to build one myself, by using a $1.5 chip...
Have you made it?
I think its not acceptable a computer uses more than 100w these days. that's why I don't have desktops anymore.
how do you choose ur atx powersupply instead?
old motherboards are +5v heavy while newer ones are +12v heavy. is it safe to use a 12v one with older boards? its just about the maximum amperage on each line?
For some of the faster Athlon XP you might want to look at around 30-35A on the 5V rail to be sure, some 750+ W PSUs got enough there (despite the system hardly using 350W)
For something like a 486 with adapter anything decent should bring enough.
how do you choose ur atx powersupply instead?
old motherboards are +5v heavy while newer ones are +12v heavy. is it safe to use a 12v one with older boards? its just about the maximum amperage on each line?
+SpaceMarineITA It is safe up to the rated power draw. A 486 consumes bugger all power.
+philscomputerlab "A 486 consumes bugger all power." What does that mean?
Very very little.
+philscomputerlab Thanks, I learned something :-)