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Vcore fluctuation

M

monster64

Banned
I cant overclock my cpu too much, because of vcore flux. Lets say at 2700 mhz it needs a minimum of 1.55 v to work. No matter what vcore setting I set in the bios, the vcore always drops to atleast 1.53 v. So in the bios if I set it anywhere from 1.535 to 1.65, the vcore will always drop to 1.53 for an instant no matter what, and thats when my computer crashes. Is there any way to prevent this? My motherboard, asus a8n-sli has a vcore mod to raise the voltage, I think it can only give 1.6 v max and it raises it to 1.66, but not a v droop mod like some mobos do. Is it my psu or mobo thats causing this? Is it fixable?
 
Cool and Quiet is disabled, My PSU is Fortron 530W 3.3v-28A, 5v-40A, 12v-18A.
EDIT: Im pretty sure its my mobo, but is there anything I can do?
 
It only has 18A on the 12v rail? Is it by any chance a dual rail model? If not, you probably need to get a more powerful psu.

EDIT: By more powerful, I mean with more amperage on the 12V rail. Something around 25A @ 12V should be fine.
 
Is it my psu or mobo thats causing this? Is it fixable?
Click to expand...

If you can find some free proggie to install that will keep a log of the PSU voltage rails you can help determine which it is. Motherboard Monitor 5 does it, but I don't think it will "auto setup" on that new board as the guy running the show quit a year or so ago.

If the PSU rails are holding up steady, I'd look elsewhere for the culprit.

Might check into whether this is a common problem for that mobo and if newer BIOS have been released to help with the problem.

Fern
 
It's only a single rail PSU, and it only has 18A on the 12V rail. I would look to that as the source of your problem. Does the voltage fluctuate as much if you don't overclock?
 
18A for a 530W? thats weak. My 400Watt Antec has 20A. With an OC'd rig, SLi, etc. You're probably overtaxing your PSU. Time to upgrade...
 
yeah, 12V@18A is just not good enough for today's hardware, esp. SLI.

get a new PSU with 25A minimum on the 12V line, and you'll prob be fine.
 
My setup:
Asus a8n-sli
XFX 6800 GT @ 410/1120
3500+ venice @2700, 1.58 vcore
2 dimms (giel 512x2 ddr500 @drr 490 2.5-3-3-6 @2.9 v)
Audigy 2 value
Maxtor 160 GB IDE 7200 rpm
floppy & dvd/cd burner

So 25A on the 12v should be fine? If im looking to a second video card sometime in the future, would 25A still be fine? Anyone have any recommendations? Trying to stay under $50.


 
Originally posted by: monster64
My setup:
Asus a8n-sli
XFX 6800 GT @ 410/1120
3500+ venice @2700, 1.58 vcore
2 dimms (giel 512x2 ddr500 @drr 490 2.5-3-3-6 @2.9 v)
Audigy 2 value
Maxtor 160 GB IDE 7200 rpm
floppy & dvd/cd burner

So 25A on the 12v should be fine? If im looking to a second video card sometime in the future, would 25A still be fine? Anyone have any recommendations? Trying to stay under $50.
Click to expand...

you will hear this from EVERYONE on this forum: do NOT cheap out on your PSU. if you buy a cheap one, there is a good chance that it will

1. die
2. die and take out some of your computer with it
3. just not provide enough juice for good (stable) operation

stick with quality namebrands ONLY (you can look around these forums/google, there's a somewhat agreed upon list of good PSU brands), or you could very well end up regretting it.

as for how many amps, 12V@25A is enough for one video card and your setup. however, for two (power hungry nvidia) video cards, it might not be enough. i think i remember reading that for your mobo, the 12V rail needs >~17A for one vid card and >~25A for two vid cards. if you overclock, your power requirements will be even higher.

you might want to look into dual (or quad) +12V rail PSUs for an SLI setup. also, get a PSU that supports ATX 2.0 and has the 24 pin connector (rather than 20 pin). spend the extra $25-$50 on the PSU - there's lots of dependable ones in the $75 range - it'll definitely be worth it.
 
Originally posted by: NINaudio
It's only a single rail PSU, and it only has 18A on the 12V rail. I would look to that as the source of your problem. Does the voltage fluctuate as much if you don't overclock?
Click to expand...

I'm having trouble beleiving that a Fortron @ 530w has only 18a on the 12v rail. These are very good PSU's

Here's a quote from another review site:

One favorite feature of the Fortron 530W was the adjustable potentiometers. I checked around and was able to find the adjustable pots inside the power supply. There were four altogether, one for each rail. Because there are two independent 12v rails, the adjustable pots for those are separate.
Click to expand...

This indicates it is indeed a "Dual Rail" PSU

I'll look for more confirmation

Fern
 
Originally posted by: Fern
Originally posted by: NINaudio
It's only a single rail PSU, and it only has 18A on the 12V rail. I would look to that as the source of your problem. Does the voltage fluctuate as much if you don't overclock?
Click to expand...

I'm having trouble beleiving that a Fortron @ 530w has only 18a on the 12v rail. These are very good PSU's

Here's a quote from another review site:

One favorite feature of the Fortron 530W was the adjustable potentiometers. I checked around and was able to find the adjustable pots inside the power supply. There were four altogether, one for each rail. Because there are two independent 12v rails, the adjustable pots for those are separate.
Click to expand...

This indicates it is indeed a "Dual Rail" PSU

I'll look for more confirmation

Fern
Click to expand...

if that's true, then your PSU would suffice. fortron is a good brand, so i suppose it could be dual rail.
 
Well, I was just gonna edit my post. But it'll be overlooked. You guys are QUICK!

Anyway google gives me mixed data. Might be a good idea for the OP to post the specific PSU (ex. "FSP530-60GNA")

From reading some reviews it MAY be that he an "older" type PSU. Used to be that the 5v rail was the important one. And this thing has 40amps on that rail according to some sites I checked. So, it's possible that this Fortron COULD only have 18amps on the 12v rail.

Somebody around here can do the math (add up the amps on the various rails and determine the watts etc.)

I just find it odd, cuz the Fortron 350-400w units have about 18amps on the 12v rail. Normally, you'd expect a lot more on 530watter

Fern
 
Well, according to OP, he bought the model in the link he posted. If so, it is only single rail and does only have 18A on the 12V rail.

OP:

I would look at some of these models:

Antec Smart Power: 450W, 12V1@ 15A, 12V2 @ 17A

Antec True Power: 480W, 12V1 @ 18A, 12v2 @ 18A

Enermax Whisper: 460W, 12V @ 33A

Fortron Blue Storm: 500W, 12V1 @ 15A, 12V2 @ 15A

Those are just a few I pulled freom Newegg. You should stick with brands like Antec, Fortron, Enermax, OCZ, etc. Especially since you're OC'ing.
 
Also, if I put my computer into standby mode then resume, the vcore wont go more than 1.53, which will surely crash, so if I put it into standby I have to restart my computer before runing cpu intensive applictions. Is this also PSU related? The model number for my PSU is FSP530-60GNA. In a review it said that the 5v rail is a big deal for AMDs. Is this true for skt 939 too, since the review was from march 2003? I saw my PSU on Newegg, the same model number, however it seemed like it was different since it only had one fan and had 16/28A on the 12v rail. Its selling for $80, but I doubt thats the one I have. Would fortron make a newer version of the same psu without changing the model number?
 
Originally posted by: monster64
Also, if I put my computer into standby mode then resume, the vcore wont go more than 1.53, which will surely crash, so if I put it into standby I have to restart my computer before runing cpu intensive applictions. Is this also PSU related? The model number for my PSU is FSP530-60GNA. In a review it said that the 5v rail is a big deal for AMDs. Is this true for skt 939 too, since the review was from march 2003? I saw my PSU on Newegg, the same model number, however it seemed like it was different since it only had one fan and had 16/28A on the 12v rail. Its selling for $80, but I doubt thats the one I have. Would fortron make a newer version of the same psu without changing the model number?
Click to expand...

the 12V rail is definitely the most important one for modern day CPU & video. back in 2003, maybe 5v was more important, i'm not sure, but a lot changes in 2 years 🙂

the easiest way to tell how many amps are on the 12V line of your PSU... is to look at it! it should have a big sticker on it, that lists all the lines and the amps they can support. From the model number and google, it looks like your PSU has a single 12V line that can only do 18A. this is just not good enough, esp. for SLI.

if that's the case, check the links in the above post for some good PSUs. also, you might want to read this:

http://www.computerforum.com/showthread.php?t=10764
 
Yes it has 18a, and yes it has dual rails. Contrary to popular belief and the ATX 2.0 spec that everyone is using for SLI boards, dual rail PS's SUCK for overclocking and SLI systems they are server and workstation PS's. Get a single rail PS with a strong 12v rail. I can't tell you how many times I've seen this in the last 6 months.
 
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