Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: Quick question about my PSU.

27 Dec 2010   #1
Teekz

Windows 7 Ultimate (x64) Service Pack 1
 
 
Quick question about my PSU.

Hello, all.

Right, I only have a 400W PSU at the minute, and I fear this is not enough to properly power my machine. I intend to buy a new one at 750W some time soon, but I wonder if there is a way to determine if my current PSU is a little too weak for my system?

I have attached a snip of SpeedFan's power section, in case that could be an indicator.

Cheers,
Tom.




Attached Images
Quick question about my PSU.-power.jpg 
My System SpecsSystem Spec
.
27 Dec 2010   #2
Dwarf

Windows 8.1 Pro RTM x64
 
 

Those voltages don't look right. The +5V lines are well out of spec. What figures do you get on the appropriate page in the BIOS?

The voltages should lie within the following ranges (we can ignore the negative rails, as these are not used any more):

Loose Tolerance -10%/+8%:

3.3V 2.97V / 3.63V
5.0V 4.5V / 5.4V
12.0V 10.8V / 12.9V

Tight Tolerance -5%/+5%

3.3V 3.135V / 3.465V
5.0V 4.75V / 5.25V
12.0V 11.4V / 12.6V

Your +5V line is reporting a deviation from the nominal level of +37% in the first column and -28% in the second, both figures are well out of the tolerance ranges.
My System SpecsSystem Spec
27 Dec 2010   #3
Ivan the SoSo

windows 10 pro 64 bit
 
 

the 5 volts out of spec but here it is...eXtreme Power Supply Calculator
I use 996 watts....
My System SpecsSystem Spec
.

27 Dec 2010   #4
Teekz

Windows 7 Ultimate (x64) Service Pack 1
 
 

Well, assuming I entered everything correctly, I got "Minimum PSU Wattage: 385W", and "Recommended PSU Wattage: 435W", but I added 40% aging to be safe, since my machine is on a lot. Based on this, I think my new 750W should do the trick, once I actually buy it.

A few questions, if you don't mind.

- Is it possible to damage my system by installing a PSU that is too powerful, or is it regulated somehow?
- What does it mean that my tolerance ranges are out by quite a bit? Should I be concerned?

I'll reboot and check the BIOS power values now, and report back with them in a moment.
My System SpecsSystem Spec
27 Dec 2010   #5
Teekz

Windows 7 Ultimate (x64) Service Pack 1
 
 

I have the BIOS values.

Vcore = 1.326V
DDR2 1.8V = 1.856V
+3.3V = 3.392V
+12V = 12.302V
My System SpecsSystem Spec
27 Dec 2010   #6
Ivan the SoSo

windows 10 pro 64 bit
 
 

No.... I'm running 1260 watts with dual PSU's

The voltage has a range that is acceptable... ie... +/-10% of 5.00 volts is .5 volts so 4.5-5.5 volts is good...your running 3.60-6.85 way out of range

Yes...one your at the limit of the power supply...two the 5 volts unstable....
My System SpecsSystem Spec
27 Dec 2010   #7
Teekz

Windows 7 Ultimate (x64) Service Pack 1
 
 

I shall make it a priority to upgrade my PSU as soon as possible, then. I plan to buy a 750W one, made by my local computer shop, is there any chance you could verify that it will be suitable for the job?

I intend to buy this.
My System SpecsSystem Spec
27 Dec 2010   #8
Dwarf

Windows 8.1 Pro RTM x64
 
 

Quote   Quote: Originally Posted by Teekz View Post
Well, assuming I entered everything correctly, I got "Minimum PSU Wattage: 385W", and "Recommended PSU Wattage: 435W", but I added 40% aging to be safe, since my machine is on a lot. Based on this, I think my new 750W should do the trick, once I actually buy it.

A few questions, if you don't mind.

- Is it possible to damage my system by installing a PSU that is too powerful, or is it regulated somehow?
- What does it mean that my tolerance ranges are out by quite a bit? Should I be concerned?

I'll reboot and check the BIOS power values now, and report back with them in a moment.
You cannot damage a system by installing a PSU with greater capacity than your system requires, and this will also give room for further expansion as well as running cooler/more efficiently.

Voltage tolerances are very important, because dropping below the limits can cause malfunctioning and exceeding the limits can actually damage your hardware.
Quote   Quote: Originally Posted by Teekz View Post
I have the BIOS values.

Vcore = 1.326V
DDR2 1.8V = 1.856V
+3.3V = 3.392V
+12V = 12.302V
Those figures look fine, but what about the +5V rail as this is the one that is out of spec?

It could well be that there is nothing wrong with the +5V rail, other than the value being incorrectly reported by SpeedFan. I think that is probably the case, since a +5V rail that far out of spec will prevent your system from running at all.
My System SpecsSystem Spec
27 Dec 2010   #9
Ivan the SoSo

windows 10 pro 64 bit
 
 

Quote   Quote: Originally Posted by Teekz View Post
I shall make it a priority to upgrade my PSU as soon as possible, then. I plan to buy a 750W one, made by my local computer shop, is there any chance you could verify that it will be suitable for the job?

I intend to buy this.
It should be, but I can't vouch for the company....
My System SpecsSystem Spec
27 Dec 2010   #10
Teekz

Windows 7 Ultimate (x64) Service Pack 1
 
 

Quote   Quote: Originally Posted by Dwarf View Post
Those figures look fine, but what about the +5V rail as this is the one that is out of spec?

It could well be that there is nothing wrong with the +5V rail, other than the value being incorrectly reported by SpeedFan. I think that is probably the case, since a +5V rail that far out of spec will prevent your system from running at all.
There was no +5V value in my BIOS, I was slightly confused, as I expected one.

Still, I think this one will do, until I buy my new one. I think the store re-opens on January 4th, so I'll probably buy one around that time.

Thanks for the help.
My System SpecsSystem Spec
Reply

 Quick question about my PSU.




Thread Tools




Similar help and support threads
Thread Forum
Just a quick question
Can a system hang and give memory dump BSOD if the power supply has gone bad but it's still in a working condition?
Performance & Maintenance
Quick Question...
I'm converting a bunch of DVD files to MKV and expect it to take quite a bit of time. My 8yr old daughter has her own user account, and uses the computer a lot for school and games, and obviously I don't want her to accidentally disturb the running task.. If I switch from my user account to hers,...
General Discussion
Quick Question?
Does this laptop have a dual core processor? (im an intel fanboy) :D Newegg.com - TOSHIBA Satellite L505D-LS5002 NoteBook AMD Sempron M100(2.0GHz) 15.6" 2GB Memory DDR2 800 250GB HDD 5400rpm DVD Super Multi ATI Radeon 4100
General Discussion
Quick Quick Question :D
ok. i have win7 ultimate 64bit RC. now if i buy win7 ultimate 64bit will i have to format my drive in the process? or would i be able to keep everything i have installed? thanks people.
Installation & Setup
Quick question
whats the command to open "About Windows" were it tells you how long windows is activated for..ect Thanks
General Discussion


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 14:01.
Twitter Facebook Google+ Seven Forums iOS App Seven Forums Android App