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PSU versus UPS

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July 23, 2011 7:10:25 PM

Hi , I have a AMD Phenom II X3 720 processor and A Gigabyte UD4P-790XT Motherboard running a single 2GB DDR3 1333 MHz Ram stick,its also equipped with Seagate 500GB Sata II and a Seagate 1 TB Sata II and a HP DVD Writer,also connected is a another Sata II 160 GB to ESata port and also a 120 GB USB External HDD,with a 19inch Samsung LCD ,i have a Cooler Master 600 watt PSU ,my question is with this config which UPS should i buy ? As i already have a APC 500VA UPS but the backup time just lasts for about 10 seconds ,though its 10 years old,should i plan on replacing the battery ,will that help ? Or Should i purchase a new one ? Please Suggest .

More about : psu versus ups

a b ) Power supply
July 23, 2011 9:24:06 PM

Sorry , CM600W is bad effisiency, 500Va UPS cannot enough for that psu, I think for 4month you need New battery beacuse overload, if you buy battery higher Ah (Ampere hours) charger UPS in longtime will damage. And this needed UPS xxxVa to PSU :
This review cm 600W : www.hardwaresecrets.com/article/Cooler-Master-eXtreme-P...

See label psu :
Example : 600 (your PSU) / 0.70 (efficiency) =(857)W ---> 857W/0.77(power factor )=1112.9Va (handle UPS load )

From calculation above your UPS is not fucntion just by pass used, : D , minimum if use UPS must 2X from wattage PSU. ( Just suggestion )
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July 24, 2011 9:05:05 AM


Hey thanks firstly to reply ,would like to ask you should i then buy a new UPS may be a 600 VA or a 800 VA ? Which of these APC UPSes will solve my problem the 600 VA 0r the 800 VA ??
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a b ) Power supply
July 24, 2011 9:38:03 AM

1200va bro .. Minimum 2x , see calculation.
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a b ) Power supply
July 24, 2011 10:27:31 AM

that PC will only be drawing about 200W max. My GTX470 + Q9550 maxes at about 300W. So i'd suggest 1/3rd of what has been suggested. You've got a knackered battery, but it'll be cheaper to buy a new UPS rather than a replacement battery.
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a b ) Power supply
July 24, 2011 12:08:04 PM

lindsay_tomshardware said:
Hi , I have a AMD Phenom II X3 720 processor and A Gigabyte UD4P-790XT Motherboard running a single 2GB DDR3 1333 MHz Ram stick,its also equipped with Seagate 500GB Sata II and a Seagate 1 TB Sata II and a HP DVD Writer,also connected is a another Sata II 160 GB to ESata port and also a 120 GB USB External HDD,with a 19inch Samsung LCD ,i have a Cooler Master 600 watt PSU ,my question is with this config which UPS should i buy ? As i already have a APC 500VA UPS but the backup time just lasts for about 10 seconds ,though its 10 years old,should i plan on replacing the battery ,will that help ? Or Should i purchase a new one ? Please Suggest .


1200va, lol. That dude consistently does not know what he's talking about. The psu efficiency has no bearing on how long the battery lasts, it's how much power the computer is drawing. The computer draws the same amount of power from the battery with a 1500w psu as it would with a 350w psu.

I would suggest replacing the battery on the 500va, or get a new one, depending on the price. Even 10 seconds normally is enough. The point is not for the computer to run through a blackout, but to be protected by the surge, save your work, and shut down the computer. I would assume that if it's 10yrs old and only lasts 10 seconds that it would last at least 30 if it was new.
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a b ) Power supply
July 24, 2011 11:21:10 PM

lindsay_tomshardware said:
... should i then buy a new UPS may be a 600 VA or a 800 VA ?

Is your computer heating the room just like an electric space heater? Of course not. If is consuming 200 watts or less. And never more than 350 watts.

UPS life expectancy is typically three years. So that a degraded UPS battery can still provide up to 350 watts after three years, a 500 watt UPS is more than enough. Your UPS (at ten years) should have a battery so defective as to not provide enough power even for 10 seconds. Apparently life expectancy of your UPS was better than most. As others with electrical knowledge have said, your computer is (without doubt) consuming 350 watts. Probably much less. 1200 watts is obviously bogus. You computer parts burn skin when touched? Of course not.

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July 25, 2011 5:23:03 AM

Hey Guys Thanks for replies , but i would also plan on buying another 2GB DDR3 1333MHz ram module and also upgrade my graphics card to a ATI Radeon 5770 or a 58 series ,can you also suggest which high end card can work with my current 600W PSU and accordingly which UPS should i get ??
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a b ) Power supply
July 25, 2011 1:30:38 PM

lindsay_tomshardware said:
,can you also suggest which high end card can work with my current 600W PSU and accordingly which UPS should i get ??


Power numbers (350 watts max) do not change. Those numbers are for virutally every computer. Why does the famous Tim Allen joke exist: More Power!!!
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a b ) Power supply
July 25, 2011 3:08:22 PM

Your power supply is sufficient for those parts and a 5770.
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a b ) Power supply
July 26, 2011 2:04:35 AM

westom said:
Is your computer heating the room just like an electric space heater? Of course not. If is consuming 200 watts or less. And never more than 350 watts.

UPS life expectancy is typically three years. So that a degraded UPS battery can still provide up to 350 watts after three years, a 500 watt UPS is more than enough. Your UPS (at ten years) should have a battery so defective as to not provide enough power even for 10 seconds. Apparently life expectancy of your UPS was better than most. As others with electrical knowledge have said, your computer is (without doubt) consuming 350 watts. Probably much less. 1200 watts is obviously bogus. You computer parts burn skin when touched? Of course not.

The batteries are expected to last for 3 years, but a quality UPS like the OP's APC will last a lot longer.
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