Voltage fluctuations....

[Shimmishim]

What is the allowable fluctuations in voltage...

I'm currently running an 8rda+
Tbred B 2100+
300W PSU Antec

here are the voltage readings...

Vcore: set to 1.8V between: 1.808V to 1.824V
Vdimm: set to 2.77V shows as: 2.720V
+5 line 4.838V
+12 line 12.038-12.099
-12 line -12.034V
-5 line -4.998V

the +5 line seems a little low to me...

what do y'all think?

 

[techfuzz]

They're all within 10%, they're ok.

techfuzz

 

[ChampionAtTufshop]

when/if you overclock, that +5v will give you a problem probably

otherwise its ok

(you dont evenhave to pay attn to the negative voltages nowadays ...just an fyi )

 

[Duvie]

I agree start at low on 5v and you can very well be limited on ocing...however I seen some mobos with some strange voltage reporting....With Athlons it is nice to have a very tight +5v...The lower +5v goes in line with the vdimm being low as well...this could be mobo related though.

Actually I believe the allowable is +/- 5%...And you still are within that range....

 

[Shimmishim]

I read that you need a minimum of 220W for the newer xp and p4 systems for the +3.3V and +5V lines... and i have 160W total...

hmm... maybe i should get a new PSU...

 

[mechBgon]

Yeah, probably a good idea. I was looking at your rig specs and see that you have one of those Thermaltake SmartFan II's coming? Thermaltake's site says this fan draws 8W of power at full throttle, so don't power it from a motherboard header. That's more power drain than most 120mm high-output fans. And it's also 8W that's not available to power your CPU.

 

[Shimmishim]

thanks for the heads up... i already have my smart fan 2 installed ... i guess that's causing problems drawing 8W of power out of my available 160W... but which line is it drawing from... my 3.3, 5, or 12V line?

 

[mechBgon]

12V line.

 

[Shimmishim]

it's already running on my mobo...

i've decided to get an antec smart power 300W solution series psu... it provides 220W to the 3.3V and 5V line combined and max of 280W with the 12V line...

i've read in multiple posts that the minimum for newer xp and p4 systems is 220W for the 3.3V and 5V lines combined...

hope this fixes my problem

 

[mechBgon]

Originally posted by: Shimmishim
it's already running on my mobo...

i've decided to get an antec smart power 300W solution series psu... it provides 220W to the 3.3V and 5V line combined and max of 280W with the 12V line...

i've read in multiple posts that the minimum for newer xp and p4 systems is 220W for the 3.3V and 5V lines combined...

hope this fixes my problem

After seeing this guy fry his mobo header, I'd be powering that fan off the PSU directly if it were me

 

[Shimmishim]

thanks for the heads up!!! however, my cpu temp doesn't go beyond 45C and the fan only hits about 3000 prm's... according to the USDM i'm using with my 8RDA+.....

if i were to power it directly from the PSU and not the mobo, how could i monitor the fan speed? could i still leave it still attached to the mobo header AND the PSU directly? or one or the other?

 

[mechBgon]

If you want to monitor the RPM, you can use their multiplexer which has one wire going to a three-pin plug. That sends the RPM signal to the mobo while drawing power/ground from the PSU. Much safer IMHO. :Q In this photo, it's the one right above the set of screws.

 

[Shimmishim]

link broken

 

[mechBgon]

Darn, hate it when I do that Fixed linkie

 

[Shimmishim]

ahh gotcha, use the plug that's right next to the fan... .... but the thing is that i don't want this beast to run at full speed ALL the time... i'm using the thermocouple right now so that the speed will vary with temp... and it's been working so far...

it goes down from 2500 rpms at 39C up to 3000 rpms at 44C

maybe i should just use the manual speed control...