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April 20th, 2004, 12:13 PM
#1
Power supply. does wattage matter?
Hi
My friends desktop computer power supply has a problem?
I told him he has to buy a new power supply.I also told him he has to buy a power supply with same wattage and amps.am i correct?
does it have to be same wattage? what happens if it is lesser than the original power box wattage? is there a particular minimum and maximum wattage for a particular hardware configuration?
Thanks
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April 20th, 2004, 12:28 PM
#2
hmmm...
Not necessarily, although you should never go DOWN in wattage from the original, anything bigger should be fine. And yes, there are some general guidelines for reasonable expectations. If you can provide specific system specs, we'll try to advise you more specifically, but in general, 350 watts or more for a modern PC is normal. If you have two hard drives, two optical drives, and some additional case fans or USB devices, 400 watts or bigger would be a good idea.
Cost aside, you can't have too much power.
Various Windows and Linux platforms...
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April 20th, 2004, 12:28 PM
#3
Yes it does matter.
Depending on what hardware he has then obviously the more he has the more power is required from the PSU.
On a typical system, personally i wouldnt go under 350w.
Also if a new PSU required, dont get a cheap one.
If you get a cheap one it wont last long and will cause you problems.
I would go with Enermax or Antec PSU's
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April 20th, 2004, 12:58 PM
#4
Thank You Gentlemen.It makes sense.What would happen if the wattage is less? Some devices won't come on?
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April 20th, 2004, 01:02 PM
#5
You will find that if there isnt enough power to go around then yes thing wont work, and can actually be harmful, and you will notice more and more reboots without warning.
Who are you? Introduce yourself here
P3-450 powered by
Intel Core 2 Duo E6600
Gigabyte 965P DQ6
4 Gig Crucial Ballistix PC6400
Gainward Nvidia Geforce 7950GT
2X Western Digital Caviar 320GB SATA2
Soundblaster X-Fi XtremeMusic
Samsung SH-D162C DVD Rom
Lite-On SHM-165P6S DVDRW
Samsung 20" LCD Syncmaster 206BW
Thermaltake Kandalf VA9000SWA Tower
Tagan Dual Engine 700W PSU
XP PRO SP3/Windows 7 64-bit
--------------
Samsung NC10 2GB Ram
Windows 7 32-bit
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April 20th, 2004, 01:02 PM
#6
Unpredictable, unreliable, virtually undiagnosticable problems. Simply don't do it.
Various Windows and Linux platforms...
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April 20th, 2004, 01:03 PM
#7
Heh, heh beat you to it this time Shiva
Who are you? Introduce yourself here
P3-450 powered by
Intel Core 2 Duo E6600
Gigabyte 965P DQ6
4 Gig Crucial Ballistix PC6400
Gainward Nvidia Geforce 7950GT
2X Western Digital Caviar 320GB SATA2
Soundblaster X-Fi XtremeMusic
Samsung SH-D162C DVD Rom
Lite-On SHM-165P6S DVDRW
Samsung 20" LCD Syncmaster 206BW
Thermaltake Kandalf VA9000SWA Tower
Tagan Dual Engine 700W PSU
XP PRO SP3/Windows 7 64-bit
--------------
Samsung NC10 2GB Ram
Windows 7 32-bit
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April 20th, 2004, 01:15 PM
#8
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April 20th, 2004, 02:01 PM
#9
Allright.Now i have enough to enlighten the hardware store guy who said voltage doesn't matter.
Thank You once again,all.
It was fun.
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April 22nd, 2004, 10:56 AM
#10
Here's some Tech Info on Power Supplies:
Power =E x I
Power in Watts
E is the Voltage
I is the Current
Most good power supplies list the voltages and the max current.
So if you measure all Voltages and Currents in your system,use the above Formula, add them up, you'll then be able calculate the Total Power of the Unit you need.
An added side note: If current Increases and voltage stays the same, the Power Increases and Heat Increases also. What this means is that most P/S have decent Voltage regulators, and the load increase or decrease is what causes the current to increase or decrease, therefore the power does the same.
Last edited by irdreed; April 22nd, 2004 at 11:03 AM.
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April 22nd, 2004, 11:16 AM
#11
A minor point for sure, but realize that psu's also have minimum load requirements. In other words, they have to have a certain amount of power being drawn from them for it to regulate properly...some will refuse to turn on. This oftens throws some people off when they disconnect a lot of components in order to test another. The4 psu doesn't turn on, so they think they fried it.....add another component onto it and it works.
Desktop: Intel i7 960 CPU @ 4.0GHz, EVGA Classified 4-Way SLI mobo, 12GB Corsair Dominator-GT 2000 DDR3 RAM, Crucial RealSSD C300 256GB Solid State Drive, Two WD 2TB SATA drives, 2x EVGA GTX 570 Superclocked graphics cards in SLI, Coolermaster HAF X full tower case, OCZ ZX 1250w PSU, Corsair H100 CPU Cooler
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April 22nd, 2004, 11:50 AM
#12
Bistro, I understand the concept, but have never heard this before. Is this minimum generally posoed on the label of those PSU's that require a minimum load to run?
If life was simple then it would be no fun.
Regards, Mike
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April 22nd, 2004, 04:13 PM
#13
You will sometimes find it on the specs label; if not, it may be on the specs sheet inside the box or on the box itself. The good quality psu's will just shut down completely if the power draw drops below minimum load; poor quality psu's can actually be damaged if that happens, believe it or not.
I can't count on all my fingers and toes and ears how many folks I've helped in the past who went out and bought a bunch of super whiz-bang components, but then bought some psu with a name like "BurnOut Industries Finest", "HongKong Back Alley Special", "The People's Power Supply", "Maybe or MaybeNot", etc. and ended up ruining their computers. A good power supply should be right up there with the same consideration as one would give the processor.
Last edited by bistro; April 22nd, 2004 at 04:16 PM.
Desktop: Intel i7 960 CPU @ 4.0GHz, EVGA Classified 4-Way SLI mobo, 12GB Corsair Dominator-GT 2000 DDR3 RAM, Crucial RealSSD C300 256GB Solid State Drive, Two WD 2TB SATA drives, 2x EVGA GTX 570 Superclocked graphics cards in SLI, Coolermaster HAF X full tower case, OCZ ZX 1250w PSU, Corsair H100 CPU Cooler
Laptop: MSI GT60-004US, 2x Seagate Momentus XT 750GB SSD Hybrid drives in RAID 0, 16GB DDR3 1600 RAM, GeForce 670M 3GB graphics card, Networks 'Killer' N-1103 WLAN card
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April 22nd, 2004, 04:30 PM
#14
I have a great appreciation for good quality power in sufficient quantities as I replaced the 250w PSU that came with my computer with a 480w Antec. This was triggered by the purchase of a high end (at the time) video card and the anticipation of ultimately replacing most of the components over time. I have now replaced everything but the keyboard and am looking at possibly buying a Radeon 9800 Pro to replace my Ti 4200. Newegg has them for $200. In any case, power is not something I worry about right now.
If life was simple then it would be no fun.
Regards, Mike
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April 22nd, 2004, 09:25 PM
#15
Also FYI: A pentium IV, Athlon XP and Intel require a minimum of 12 amps on the 12 volt side. Even a 400Watt PSU can have lest then 12 amps on the 12volt side, and she will not boot. I have learned that from erpierence.
Please do not use "PM" for personal help, post in forum so everybody can learn
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