Depends on how many amps it has on +5V line (i can't see clearly on the photo). I looked up the specs and it shows 12 amps. IMO 3,5" HDD and CD-ROM may be a bit too much, but it would be best to use a power consumption meter ("kill-a-watt" style) and see how many watts it takes from the wall. If it is below 60W then you should be safe, if it's more, then you may be pushing it to the limits.
With CF card used for storage it should be definitely safer.

adalbert wrote on 2021-01-16, 14:27:

Depends on how many amps it has on +5V line (i can't see clearly on the photo). I looked up the specs and it shows 12 amps. IMO 3,5" HDD and CD-ROM may be a bit too much, but it would be best to use a power consumption meter ("kill-a-watt" style) and see how many watts it takes from the wall. If it is below 60W then you should be safe, if it's more, then you may be pushing it to the limits.
With CF card used for storage it should be definitely safer.

MAIN OUTPUT
+5V 12A
+12V 2A (3,5A 10sec)
+3,3V 8A (10A 200ms)
-12V 0,4A
AUX +5V 2A MAX
MAX output power 80W
COMBINED +5V & 3,3V
LOADING 70W MAX

Look on your CD drive and HDD label and see if there is specified how many amps it takes. I guess it should be something around 1,5A on +5V and 1A on +12V for each.

P233MMX is around 4A from +5V line (20 watts)
HDD 1,5A +5V (7,5W), 1A +12V (12W)
CD 1,5A +5V (7,5W), 1A +12V (12W)
other components - ? let's say 2A on +5V on each (mainboard, video, sound) = 6A (30w)

so you may have around 65W on +5V and 24W on +12V. That coud exceed the limit a bit. But maybe in reality it doesn't take so much power. HDD and CD consumes most of power only when spinning up. Anyway, if you would use CF card, or laptop 2,5" drive, instead of 3,5" HDD it should definitely help with decreasing the power consumption.

I'd start by setting it up with a 120W or greater PSU, and see how much it draws from the wall to be sure. The earliest ATI card that the power draw is known for is the Radeon VE and 7000, at 23W. Don't know any more than others here about other parts.

adalbert wrote on 2021-01-16, 14:46:

Look on your CD drive and HDD label and see if there is specified how many amps it takes. I guess it should be something around […]
Show full quote

Look on your CD drive and HDD label and see if there is specified how many amps it takes. I guess it should be something around 1,5A on +5V and 1A on +12V for each.

P233MMX is around 4A from +5V line (20 watts)
HDD 1,5A +5V (7,5W), 1A +12V (12W)
CD 1,5A +5V (7,5W), 1A +12V (12W)
other components - ? let's say 2A on +5V on each (mainboard, video, sound) = 6A (30w)

so you may have around 65W on +5V and 24W on +12V. That coud exceed the limit a bit. But maybe in reality it doesn't take so much power. HDD and CD consumes most of power only when spinning up. Anyway, if you would use CF card, or laptop 2,5" drive, instead of 3,5" HDD it should definitely help with decreasing the power consumption.

I'm considering: both 4GB CF IDE or CF (for DOS/Windows 95) and laptop 2.5" IDE drive (I have IBM Travelstar 4,86GB with 5V 500mA). Ultimately i drop CD-ROM (my mainboard has one USB 1.0 port so I can plug-in external usb CD-ROM with own ac adapter).

It should be enough, if Compaq Deskpro SFF with PII 350 Deschutes, slim CD-ROM, 2x128 MB SDRAM, 80 GB HDD, 3,5" FDD, onboard 4-8 MB ATI Rage and ESS Audiodrive has 90W PSU. And work fine even with PIII 550 Katmai and Voodoo3 2k PCI.

In general if you consider the total amount of heat that a system makes you have an idea about how much power it’s drawing. Knowing that, many pentiums were able to be passively cooled. I would say you have a pretty decent chance of powering it it with 80w but it it may be kinda close. You would improve your chances with a ssd or cf card to ide adapter and no disk drives. 🤷‍♂️Try and see.

I myself was considering running my k6 build on a 150w pico psu.

I'd personally play it safe. You wouldn't want the system to periodically shut down due to exceeding the power the PSU can handle. I'd go for 120W personally.

Sphere478 wrote on 2021-01-17, 21:22:

In general if you consider the total amount of heat that a system makes you have an idea about how much power it’s drawing. Knowing that, many pentiums were able to be passively cooled. I would say you have a pretty decent chance of powering it it with 80w but it it may be kinda close. You would improve your chances with a ssd or cf card to ide adapter and no disk drives. 🤷‍♂️Try and see.

I myself was considering running my k6 build on a 150w pico psu.

I used cheap pico psu with Zida BX98 AT mainboard with Celeron 466 and Riva TNT M64. Except ISA sound card not running (lack of negative voltage in my pico psu) system was stable. Powered with Dell laptop AC adapter.

My Pentium MMX has custom, bigger radiator. Planning to use only one 120mm 0,18A fan for whole build. I design my own computer case (cube like), in future i share some photos from build vlog. Availability decent AT computer case in good shape is very low here where i live. Thats why i consider building my own "retro cube".
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RetroLaptopy wrote on 2021-01-18, 22:35:

I used cheap pico psu with Zida BX98 AT mainboard with Celeron 466 and Riva TNT M64. Except ISA sound card not running (lack of […]
Show full quote

Sphere478 wrote on 2021-01-17, 21:22:

In general if you consider the total amount of heat that a system makes you have an idea about how much power it’s drawing. Knowing that, many pentiums were able to be passively cooled. I would say you have a pretty decent chance of powering it it with 80w but it it may be kinda close. You would improve your chances with a ssd or cf card to ide adapter and no disk drives. 🤷‍♂️Try and see.

I myself was considering running my k6 build on a 150w pico psu.

I used cheap pico psu with Zida BX98 AT mainboard with Celeron 466 and Riva TNT M64. Except ISA sound card not running (lack of negative voltage in my pico psu) system was stable. Powered with Dell laptop AC adapter.

My Pentium MMX has custom, bigger radiator. Planning to use only one 120mm 0,18A fan for whole build. I design my own computer case (cube like), in future i share some photos from build vlog. Availability decent AT computer case in good shape is very low here where i live. Thats why i consider building my own "retro cube".
I have expirience with similar build called "Minecraft PC" so efficient cooling etc are my strong points. Here are some photos.

Haha that case is awesome 🤣!! Very nice!!

Man, I hadn’t even thought about the lack of negative voltage. Good catch! That may have caused problems for me. Lucked out.

Nice build, anyway - it´s paper box? Good job!
Passive only cooling had not only P200MMX in my former Compaq Deskpro 2000, but PII 350 in Deskpro SFF EN above mentioned. Even PIII 550 from this has big radiator with only small (probably 2") fan. Of course, air stream is supplied by PSU fan.

Ydee wrote on 2021-01-19, 11:27:

Nice build, anyway - it´s paper box? Good job!
Passive only cooling had not only P200MMX in my former Compaq Deskpro 2000, but PII 350 in Deskpro SFF EN above mentioned. Even PIII 550 from this has big radiator with only small (probably 2") fan. Of course, air stream is supplied by PSU fan.

It's medium-density fibreboard (MDF) - with laser printed sticker. I drilled some wenting holes on the bottom side. I made two computers like this. One has Pentium G2020 second one Core i3, Radeon HD6770, SSD 120GB and 320GB WD HDD. Working decent back in the days (2015).

Nice. Thanks for share.