Reply 40 of 43, by pixelatedscraps
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The 30A on the 5V line is the needle in the eBaystack. I can find quite a few units with 20A on the 5V but nothing higher than that. I’ll keep an eye out for that combination of specs...
The 30A on the 5V line is the needle in the eBaystack. I can find quite a few units with 20A on the 5V but nothing higher than that. I’ll keep an eye out for that combination of specs...
pixelatedscraps wrote on 2021-03-21, 14:38:The 30A on the 5V line is the needle in the eBaystack. I can find quite a few units with 20A on the 5V but nothing higher than that. I’ll keep an eye out for that combination of specs...
My choice for my main Pentium 3 setup is a Corsair RM850x . It has 25A on the 5V rail, 25A on the 3.3V rail and a max load of 150W for those rails combined.
I don't think you would need 30A on the 5V rail for a Pentium 3 build, unless it's a dual CPU setup with an exceptional amount of add-in cards . I was worried too, initially, but everything has worked fine so far .
Here are my observations from this thread Any modern psu's that have large 5v rails that I have re-posted here and abridged for clarity .
darry wrote on 2020-05-20, 14:07:I currently have the following power-consuming parts: […]
I currently have the following power-consuming parts:
- Pentium 3 Tualatin-S @1400MHz with 512K L2 cache
- Ipox 3ETI23 industrial motherboard (815EP-based with 3 ISA slots and onboard Fast Ethernet)
- 512 MB (2x256) of PC133 SDRAM
- MSI AGP Nvidia FX 5900
- 3Dfx Voodoo 3 3000 (PCI)
- 500GB Samsung 860EVO + JMD330 IDE to SATA adapter or Promise PCI SATA controller (have yet to decide) .
- 5 and 1/4" floppy drive
- 3 and 1/2" floppy drive
- LG GSA-4167 DVD-ROM drive
- Gravis Ultrasound Ultralsound 3.73 with 1 MB RAM
- Creative AWE64 Value with 28MB RAM (thanks to SIMMCONN revival)
- Mediatrix Audiotrix 3DXG (OPL3SA) with Monster Sound (Dream 9733 4MB GS ROM) daughterboard
- 3 case fans (12V ones so not worried about those) .
- USB keyboard
- PS/2 mouse
darry wrote on 2020-05-20, 16:59:Oh, and I realized I have a Kill-a-watt type power meter . I ran Prime95 , then I ran 3DMARK 2001 at 1600x1200 . […]
Oh, and I realized I have a Kill-a-watt type power meter .
I ran Prime95 , then I ran 3DMARK 2001 at 1600x1200 .The highest load was when running 3DMARK 2001: at wall socket I got 160W using an old Enermax EG465P-VE (35A each on 3.3 and 5V and 200W combined). Assuming an
80%70% (optimistic) efficiency rating, I should be OK with the PSU providing about128W112W or less . I should be OK with the RM850x, except if I have the same issue as you do with the TX-650W ( I don't feel like throwing in more drives) .EDIT : My EG465P-VE variant (there are at least 3) has 70% efficiency at full load according to an old Bjorn3d review . https://bjorn3d.com/2003/07/enermax-eg465p-ve … c-power-supply/
darry wrote on 2020-05-24, 05:55:I installed my RM850x today and gave it spin in 3DMARK 2001 at 1600x1200 . It peaked at 146 Watts at the outlet with an average of about 130 Watts , all under load. When idle in DOS, I get about 90 Watts at the outlet . So, considering that represents less than 20% load, efficiency should be somewhere between 87 % and 90 % . That means peak power draw was, at most, about 131 Watts with an average of about 117 Watts under load .
Almost all of that is on 3.3V and 5V rails (main 12V user is probably my FX 5900 , other 12V "users" include 2 floppy drives and a DVD-ROM drive along with 3 case fans ) .
I feel I am cutting it a bit close, but I guess over-current protection will kick-in if ever things get too intense .
RM850x manual --> https://www.corsair.com/corsairmedia/sys_mast … 2018_Manual.pdf
darry wrote on 2021-03-21, 15:25:I don't think you would need 30A on the 5V rail for a Pentium 3 build, unless it's a dual CPU setup with an exceptional amount of add-in cards .
My Dual P-!!! takes a maximum of 18 amps so 25 amps is more than enough even for a Dual P-!!! system.
The PSU is a https://uk.thermaltake.com/smart-dps-g-650w-gold.html
I just managed to score a cleaned and tested FSP300-60 PLN with 180W on the 3.3V and 5V rails, and 30A just in the 5V. It wasn’t cheap at $40 and my fingers are crossed it arrives in good, working and clean condition.