RE: PC PSUs...

[Stuart Poulton <swp@xxxxxxx>]

Hi Guy's

If you're looking at more than 4 disks and an Athlon then you will
certainly need 550W, worse case is if you've got 8 disks in RAID 5,
because data has to be written to ALL 8 disks at once.

Hope this explains things.

Cheers

Stuart


On Mon, 2002-04-22 at 11:29, Timothy Morris wrote:
> Dunno Phil. I use an Enermax 430W in my PC. This is what was
suggested
> by the boys at overclockers.co.uk. (over and above your bog
standard
> 300W) Apparantly modern AMD and Intel CPUs *can* get upset by
lower
> rated PSUs. You certainly need a new PSU with P4 mobos as they have
a
> new connector on them so you might as well chuck in an extra couple
of
> quid and get a higher rated one. Why you'd need 550W is anybody's
guess.
> 
> Tim.
> 
> -----Original Message-----
> From: Phil Harris [mailto:phil@xxxxxxx] 
> Sent: 21 April 2002 00:48
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] PC PSUs...
> 
> 
> I have just been looking at PC PSU's (Ken is making me do it) as I
have
> an Althlon machine built into an old mini tower case which has a
fairly
> small PSU - certainly not Athlon or P4 approved!
> 
> Anyway, I assume the PSU is a tad underrated as sometimes when
powering
> up the Athlon machine the thing doesn't reach post and hangs but in
my
> other case with my other PSU works perfectly every time. OK ... So
the
> solution is a replacement PSU and I thought I'd look at chucking a
meaty
> one into the server and moving the current server one over to the
> Athlon.
> 
> Looking around for meaty PSUs to power the server I see that Enermax
do
> a 550w unit which has the following ratings:
>  
> DC O/P     Output current rating
> Voltage          MIN /
MAX
> 
>
3.3V             
0A / 40A 
>
+5V             
11A / 46A 
>
+12V             
4A / 24A 
>
-5V              
0A / 1A 
>
-12V             
0A / 1A 
>
+5Vsb            
0A / 1.8A 
>  
> 3.3V & +5V        300W 
>  
> TOTAL O/P         551W 
> 
> Do modern mobo's *REALLY* pull up to 40A at 3.3v?
> 
> I want a meaty PSU to enable me to power more drives reliably but
are
> these 3.3v ratings just unrealistic in respect of the requirements of
a
> modern PC? I mean the 3.3 and 5v rails make up most of the rating of
the
> PSU but surely hard drives and CD Writers drain large 12v loads
too?
> 
> Does anyone really know what current drains at each voltage PCs
draw
> these days?
> 
> Phil
> 
>



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