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- Dec 20, 2001
What are the minium and I mean minium power requirments for an AMD system.
T-Bird 1.4, CD-Rom, NIC, HDD, SDRAM, AGP video
T-Bird 1.4, CD-Rom, NIC, HDD, SDRAM, AGP video
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{PMS}fishy said:Come on guys you are killing me. I have that same set up going on 200w right now. It needs to be as small as possible, as I am cramming it into one of those little IBM netvista cases. 4"x12"x13" I have 2 90w PSUs that I might try to hook together.
{PMS}fishy said:What are the minium and I mean minium power requirments for an AMD system.
T-Bird 1.4, CD-Rom, NIC, HDD, SDRAM, AGP video
The Coolest said:
You may just be squessing every last drop out of that PSU, and it just might die on you and in the worst scenario take some hardware with it, I strongly suggest you upgrade the PSU. It might seem its running ok, and it will untill the PSU just simply dies. I read many times of 250watters dieing when using on AMD chips...
PCphreak said:
Aside from AMD recommended requirements, let's look at what your system is roughly asking for.
With a PSU, there are two ratings you want to look at. One rating being most important: Combined 3.3 & 5v wattage. The 12v wattage is second in importance. Again, *combined* 3.3 & 5v wattage is most important. The 'combined rating' for the 3.3v & 5v rails should only be looked at regardless of their actual individual rating. The reason is because the 3.3v and 5v rails are on the same regulation circuit. This means you can't draw the max amps simultaneously on both lines, but must keep the total combined draw between the two at the 'combined rating'.
You'll see why the combined rating for the 3.3 & 5v is most important when you look at how much power really gets drawn from it.
Here's a very basic list of max amp draw on 5v rail:
Mobo - 5a
CPU T-bird 1.4- max 40a
PCI - 2a each slot
Drive Logic (IDE & Floppy) - .5a to 1a each drive
AGP can draw up to a max of 110 watts...newer 4x cards signal using 1.5 volts instead of 3.3v- but are still powered off the 3.3v rail. Average your probably looking at 50 watts or less for a typical AGP card.
I'm not sure how much max power SDRAM will draw, but maximum your current setup will require a maximum of 49 amps on the 5v without the RAM....would this ever occur?....very very unlikely, because generally components never draw anywhere close to the max spec.
I would guess your pulling 100 watts or less on the 5v and 3.3 v rails with your system- based also on using an old/slow AGP card. With moderate use, your T-bird will cause a bit more of a load.
I'm not going to get into 12v power usage, because it's really negligable. Most fans draw about .1a and HDD motors draw about 1a after spin-up.
So W I T H O U T heavy usage, you could probably pull it off with a decent 250 watt PSU. A decent power supply will have a strong 3.3 & 5v combined rating.
-PC
PCphreak said:
..
Here's a very basic list of max amp draw on 5v rail:
Mobo - 5a
CPU T-bird 1.4- max 40a
PCI - 2a each slot
Drive Logic (IDE & Floppy) - .5a to 1a each drive
.....
With moderate use, your T-bird will cause a bit more of a load.
I'm not going to get into 12v power usage, because it's really negligable. Most fans draw about .1a and HDD motors draw about 1a after spin-up.
-PC
papounet said:dear PCphreak,
I am afraid that the CPU is fed from the 12V line
papounet said:
I beg to differ nonetheless, as I based my remark on AMD processor using 12V converted down by VRM on the table 2 page 11 of Builders Guide for Desktop/Tower Systems http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26003.pdf