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Which components use which rails?

M

metagroboliser

n00b
Joined
Jan 28, 2005
Messages
48
Here's what I'm guessing so far:

- A64 CPU: +12v (Older cpu: +5v?)
- HDD/Optical: +12v
- Graphics Card: ????
- Memory: +3v
- USB devices: ????
- Case/HS fans: +12v
- Other: ????


Please correct/complete.

cheers.
 
metagroboliser said:
Please correct/complete.
Click to expand...


http://takaman.jp/D/index.html?english
not listed PCI-E = +12V2
to the tune of about 75Watts\6.25A (soon 150W\12.5A) per vid card


templarknightx said:
All I can add is that CPU uses 12v2
Click to expand...

vice versa
CPU is on the +12V1
following the EPS12V example but limited to only 2 rails on the ATX12V v2.01 spec

EPS12V 6.1.1 12V Power Rail Configuration

There are two types of 12V rail configurations for systems: 'Common plane' and "Split plane' processor power delivery. The 'commob plane' system has both processors powered from a single 12V rail (+12V1) from the power supply. The 'split plane' system has both processors powered by seperate 12V rails (+12V1 and +12V2) one dedicated to each processor. The system in both cases, has an additional 12V rail to power the rest of the baseboard +12V loads and dc/dc converters. +12V1, +12V2 and +12V3 should not be connected together on the baseboard to ensure that 240VA protection circuits in the power supply operate properly

Table 6: 12V Rail Summary
........................................................................................................................................................................................
Common Plane System........................................................Split Plane System
+12V1........Processors.........................................................+12V1........Processor 1
+12V2........Baseboard components other than processors.......+12V2........Processor 2
+12V3........Drives and peripherals..........................................+12V3........Baseboards and components other than processors
...........................................................................................+12V4........Drives and peripherals
Click to expand...
 
I was suprised to learn from the pinout diagram for my new Enermax NT 701ax that the sata power connectors are not on the same +12v rail as the regular 4-pin molex connectors.

Is what devices are powered by which of the two 12v rails an absolute standard, or do the psu manufacturers have some discretion around the edges?
 
they always have discretion
and often dont specify whats what :p


not familiar with the NT701AX
sure its not EG701AX Coolergiant?

placing the SATAs on the same rail as the CPU doesnt make alot of sense to me
unless they figure that rail can take a certain amount of dynamic load from just a limited number of HDDs (which while not truely static, arent all that variable once they have spun up)
it runs counter to the EPS12V thinking shown above, and all drives are very dynamic when they spinup
 
Ice Czar said:
they always have discretion
and often dont specify whats what :p


not familiar with the NT701AX
sure its not EG701AX Coolergiant?

placing the SATAs on the same rail as the CPU doesnt make alot of sense to me
unless they figure that rail can take a certain amount of dynamic load from just a limited number of HDDs (which while not truely static, arent all that variable once they have spun up)
it runs counter to the EPS12V thinking shown above, and all drives are very dynamic when they spinup
Click to expand...

Sorry, NT was just quicker to type than "Noisetaker", It's this chappy here: http://www.coolergiant.com/products/power_supplies/EG701AXVE.html

*EDIT*Wow, I've just noticed that even on the main page the specs differ from what's printed on the label on the PSU itself, the page says 18/17 for the +12v rails, while the sticker says 18/18!

Obviously the site is coolergiant, but the branding on my one is Enermax Noisetaker.
(I have a coolergiant eg485ax as well, but it was too noisy so I'm swapping it out).

I've found Enermax/Coolergiants documentation to be be somewhat inconsistent, with minor differences between printed and online info and actual specs. It's possible that the pinout diagram in the printed manual is simply wrong (the 4-pin molexs are on +12v2 and the sata connectors are listed as being on +12v1), it didn't make much sense to me either.
The manual on the site may say something different, but I can't tell because too much detail is lost when I zoom it.

It's not something I'm desperately worried about right now because I deliberately overspecced the PSU considerably so it'd be well within my requirements either way, and my sata drives have 4-pin connectors as well anyway so I can just use those to be beyond doubt.
It is something to watch out for though.
 
LOL well had it been in front of the Enermax instead of next to the 701AX I might have figured that out :p

they have so many damned model numbers and rely on them nearly as much as FSP does
at least they have started to introduce names, but I wonder why they havent come up with one for the 565 series supplies.

Ive noted inconsistencies before as well
might have something to do with the difference between Enermax
and Maxpoint the US distributor
 
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