1. ## choosing PSU

EDIT. thanks! but it doesn't change the fact that i can't type for ****...

while researching my possible PSU choices found this in the faq.
Opus Solutions 90w
12v rail = 2.5A (30w)
3.3v rail = 6A (19.8w)
5v rail = 6A (30w)
(Note that the Opus 90w PSU is no longer in production. It has been replaced by the 120w unit. I include the information on the 90w here because there are plenty of them around and can be purchased used.)

Opus Solutions 120w
12v rail = 3.5A (42w)
3.3v rail = 8A (26.4w)
5v rail = 8A (40w)

Opus Solutions 150w
12v rail = 5A (60w)
3.3v rail = 10A (33w)
5v rail = 10A (50w)

Mini-Box M1-ATX
12v = 2A (24w)
3.3v = 10A (33w)
5v = 10A (50w)

Mini-Box M2-ATX
12v rail = 8A (96w)
3.3v rail = 8A (26.4w)
5v rail = 8A (40w)

zootjeff's DSATX
12v rail = 12A (144w)
3.3v rail = 10A (33w)
5v rail = 12A (60w)
i plan to use gateway p3 system that i have sitting for some time. the specs on its factory PSU say
max output 110watt (thats funny , those online calculators suggesting i need 170 watt PSU to run this)
combined on 3.3 and 5 rail 80 watt max
12v - 2.5A
5v- 14A
5VSB - 1.5A (standby i assume)
3.3v - 4A

so it looks like no PSU will give me 14A on 5V rail, but somthing tells me that it doesn't need that much. if it turns out a problem the point of load 3A regulator (CNX-P5V 15 Watt +5V Regulator) sold here could help. other then looks like pretty much any PSU will do. i heard a lot of complains about M2 units and so far without going to much into details looks like i better avoid those. i think i'll get by with OPUS 120 watt (~ half the price of 150). will 1 extra amper on 12v rail be enough to run Lilliput screen of it too?

i plan to run P3 1Ghz system with onboard audio/video/NIC (might change to 667 celeron if absolutley needed), 2 sticks SDRAM 256 Mb, 3.5HDD ( would prefer 2 actually, to separate system and storage), CDROM (will disconnect after everything is built). planning to add GPS dongle, external slot loading DVD. IMO preformance would be adeqate for carputer purpose as it is running right now as media server for modded XBOX and torrent machine and i find it quite usable.

given this info and data on current AC PSU which unit would you get for this setup? will i get by with OPUS120 (and som point of ue regulators if needed?)

thanks

2. Originally Posted by Tankist
EDIT. you might ask me what the hell "chossing" means. well, it means i can't type for ****...
I edited the title to correct your typo. Funny, though.
At least we won't see you on the street corner holding a sign that says WILL TYPE FOR ****.
OK. I'm done now...

while researching my possible PSU choices found this in the faq.

i plan to use gateway p3 system that i have sitting for some time. the specs on its factory PSU say
max output 110watt (thats funny , those online calculators suggesting i need 170 watt PSU to run this)
combined on 3.3 and 5 rail 80 watt max
12v - 2.5A
5v- 14A
5VSB - 1.5A (standby i assume)
3.3v - 4A

so it looks like no PSU will give me 14A on 5V rail, but somthing tells me that it doesn't need that much. if it turns out a problem the point of load 3A regulator (CNX-P5V 15 Watt +5V Regulator) sold here could help. other then looks like pretty much any PSU will do. i heard a lot of complains about M2 units and so far without going to much into details looks like i better avoid those. i think i'll get by with OPUS 120 watt (~ half the price of 150). will 1 extra amper on 12v rail be enough to run Lilliput screen of it too?

i plan to run P3 1Ghz system with onboard audio/video/NIC (might change to 667 celeron if absolutley needed), 2 sticks SDRAM 256 Mb, 3.5HDD ( would prefer 2 actually, to separate system and storage), CDROM (will disconnect after everything is built). planning to add GPS dongle, external slot loading DVD. IMO preformance would be adeqate for carputer purpose as it is running right now as media server for modded XBOX and torrent machine and i find it quite usable.

given this info and data on current AC PSU which unit would you get for this setup? will i get by with OPUS120 (and som point of ue regulators if needed?)
Most power calculators use absolute max power draw for a product in that category to provide a "worst case scenario" so that estimated power draw will be above the actual power draw to allow some leeway in power supply selection.

You should be able to look at the power supply in the PC and it should specify the output on each of the three rails (12v, 5v & 3.3v). The two major concerns are 12v & 5v. If the Opus 120w that you're considering puts out the same or more than the stock PSU, then you should be golden.

Without digging into it, I'd guess that the Opus 120w would work just fine for your setup, consdiering the stock unit is rated at 110w.

Good luck.

3. i guess it got lost in long post... thats the info from AC PSU that is powering the unit right now
max output 110watt, max combined on 3.3 and 5 rail 80 watt
12v - 2.5A
5v- 14A
5VSB - 1.5A
3.3v - 4A

so if i'm getting OPUS 120 i'll get 1A extra on 12V rail (should be enough to power lilliput screen , right?) and 4A extra on 3.3 rail. on 5V rail however the OPUS going to be 6A less then the AC PSU rated. i understand these are maximum values but do you see it as a potential problem?

what PSU do/would you use to power your Pentum3 system?

4. Whoops. Yeah, I missed that. It's what I get for posting before I've finished with that first cup of coffee.

Just because the PSU puts out that much doesn't mean the CPU uses that much on the 12v rail. Keep in mind that the HDD and full-sized optical drive would also draw from teh 12v rail.
Using that logic, if you use a slim-line optical drive (or none at all) and power your Lilliput off the PSU, you should be good to go.

I think you, as a newbie to this hobby have done a fair amount of research and planning that has paid off.
Kudos!

5. ok, so it boils down to OPUS120 vs M2-ATX. while roughly the same \$ M2 has 4A more on 12V rail then opus. but i read a lot about the ammount of trouble people using the m2 go through and a bit sceptical of this unit. your thoughts on the matter?

6. I don't have an M2ATX, so I don't know.
There are at least as many people who are satisfied with their M2-ATX as there are people with problems. I'm convinced that a large percentage of the problems with the M2-ATX are user-preventable, as well.

7. Originally Posted by DarquePervert
I don't have an M2ATX, so I don't know.
There are at least as many people who are satisfied with their M2-ATX as there are people with problems. I'm convinced that a large percentage of the problems with the M2-ATX are user-preventable, as well.
Dude, so far it seems that noone besides you is reading this post!

8. Nah. I just have less of a life, so I'm checking the forums more than anyone else.

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