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What UPS do I need for my 500W PC?
#1
greetings.

I'd better begin with posting my specs

i5 2500k, max Vcore's 1.246

MSI p67a-gd65 (B3)

ATI 5750

2 HDDs

whenever I upgrade something, I'll make sure to get a new UPS, so it's not the issue here Closedeyes

I really don't know anything about buying a UPS... I told the shop owners that I wanted a 600/650W UPS, so they showed me stuff with 650 VA and said it's the same. However, the specs of the product mentioned something about 390W, which makes things more complicated for me. Here's a link for one of the UPSs I'm offered

http://www.criticalpowersupplies.co.uk/E...active-UPS

so I'm really confused: Are the VA and W identical for UPS hardware?

btw shop owners said something about a brand named "MGE" that's supposed to be "better," any comments guys ?

Intel Core i5 2500k 3.4 > 4.5 GHz 1.26v Biggrin
Thermaltake SpinQ VT
Nvidia GTX 560 (OC 950/1200), 1GB GDDR5, (MSI N560GTX).
Biostar TP67XE
8 GB Zepplin RAM, @1600. 11-11-11-30 Glare
FSP Saga II 500W
Windows 7 Ultimate x64 SP1
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#2
Watts and VA are similar only for resistive loads but differ when there are impedances like capacitance or indutance. To put in layman terms, VA does not take into account the loss introduced by the phase shift between the voltage and current, so it displays a greater number. On the other hand the Watt is what is being used to generate work and the diference between the two is known as power factor and measured as the cos of the angle deviating from the "real" line toward the imaginary axis (that is what is called the complex field).

So, if two devices have the same number figure, the one expressed in Watts has more actual output power.

Edit: Notice that PSU has a indutive load due to it's transformer (which is what is seen as load by the UPS) and so, in full load the VA might not be enough to support the demand and the batteries will discharge faster than should (part of the energy drained being lost on the imaginary field and producing no work at all).

Anyway, the UPS should be seen at consumer level as safeguard against data loss and the equipment should be powered down as soon as possible by normal means unless the energy is expected to return quickly enough. Surely one should not play games or any demanding task under emergency power.
Imagination is where we are truly real
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#3
Rolleyes thanks for explaining, that was an enjoyable read.

EDIT:

never mind Smile - I found the answer
Intel Core i5 2500k 3.4 > 4.5 GHz 1.26v Biggrin
Thermaltake SpinQ VT
Nvidia GTX 560 (OC 950/1200), 1GB GDDR5, (MSI N560GTX).
Biostar TP67XE
8 GB Zepplin RAM, @1600. 11-11-11-30 Glare
FSP Saga II 500W
Windows 7 Ultimate x64 SP1
Reply
#4
your 500W PC is more than enough for your 650VA UPS

mine is APC ES 500(500VA) in a PSU 550W+i5-2500 PC is already enough during power outrage around 10min runtime.

i have even had a power inverter(power brick) if you are interested
but i think it's more expensive because of the car battery Tongue
http://forums.pcsx2.net/Thread-is-my-lap...r+inverter
Main Hub:i5-4670(3.4Ghz Factory Clocked),ATi Radeon HD7770(GDDR5+128-bit+1GB),Win 10 SL(x64),ASUS H8M-E,8GB DDR3 RAM
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#5
Even at full load (prime95+furmark+whatever), 2500k+5750 isn't going to be drawing more than 300W at the wall.

No harm in having a little extra battery run time though.
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#6
Thanks so much for the replies guys.Smile

Actually, I bought a 1600 VA/960W UPS right after posting for the second time in this thread. I kinda have exams and there's no time for me to be picky in a dead market...

BTW, tallbender, I think a good UPS is always more expensive than an inverter of the same class. It's mainly because of the sine wave thingy, which inverters don't have.

Also, inverters are no good for desktop PCs, since they need about 1-2 seconds to start providing power after a power outage/failure. << This, of course, is bound to my limited knowledge.
Intel Core i5 2500k 3.4 > 4.5 GHz 1.26v Biggrin
Thermaltake SpinQ VT
Nvidia GTX 560 (OC 950/1200), 1GB GDDR5, (MSI N560GTX).
Biostar TP67XE
8 GB Zepplin RAM, @1600. 11-11-11-30 Glare
FSP Saga II 500W
Windows 7 Ultimate x64 SP1
Reply




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