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Need help in choosing the psu of right wattage. Please help me.

Last response: in Components
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July 6, 2013 10:25:42 AM

Hi all,
My pc rig is -
processor- Intel 3.4 GHz LGA1155 Core i7 3770
motherboard- Intel DH77KC Motherboard
ram - G.Skill RipjawsX DDR3 8 GB (2 x 4 GB) PC RAM (F3-12800CL9D-8GBXL)
hdd - WD 1 TB Black Desktop Internal Hard Drive (WD1002FAEX)
Dvd writer- Samsung SH-224DB/IDDS DVD Burner Internal Optical Drive/asus
monitor- Dell S2240L 21.5 inch LED Backlit LCD Monitor (Black)
keyboard- Razer Arctosa USB 2.0 Keyboard (Silver) Wired Desktop 200 Black

I WILL UPGRADE THE GRAPHICS CARD LATER WHICH WILL BE - Asus NVIDIA GTX660 TI-DC2T-2GD5 2 GB GDDR5

please tell me 1) what should be the right wattage of the psu, and pls inform the model( i found on internet that antec and corsair makes good smps/psu)
2) what should be the right wattage of the ups ( in india apc makes good ups)
3) And lastly what should be the cabinet.

I know my number of question is many but please help me. thank you all.

More about : choosing psu wattage

a c 223 V Motherboard
July 6, 2013 1:31:18 PM

For a system using a single GeForce GTX 660 Ti graphics card NVIDIA specifies a minimum of a 450 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 24 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most important factor.

Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

The Seasonic S12II-520 Bronze (SS-520GB), with its maximum combined +12 Volt continuous current rating of 40 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single GeForce GTX 660 Ti graphics card.

Seasonic S12II 520 Watts Rs. 4586 (Inclusive of taxes)
http://www.flipkart.com/seasonic-s12ii-520-watts-psu/p/...

The UPS type and capacity required will depend on the devices you're intending to plug into it and the length of desired battery backup runtime during a power grid outage event. You may have to get a pure sine wave UPS depending upon the PSU you end up purchasing.
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July 6, 2013 1:56:45 PM

extreemly thank you for this help sir. one thing, im not going to attach any kind of thing with the ups except the computer, and i need this ups to run my computer 1 hour(not more than one hour) after the power cut. so kindly if you tell the approximate amount of wattage the ups need then it will be very big help sir. thank you.
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a c 223 V Motherboard
July 6, 2013 2:46:57 PM

guddufromkolkata said:
extreemly thank you for this help sir. one thing, im not going to attach any kind of thing with the ups except the computer, and i need this ups to run my computer 1 hour(not more than one hour) after the power cut. so kindly if you tell the approximate amount of wattage the ups need then it will be very big help sir. thank you.


The computer isn't of much use without the monitor being powered so that you can see the status of shutdown.

With both the computer system and monitor plugged into the UPS your maximum power draw, based on the components you've listed, should be around 400 Watts.

Based on APC's default 5 minutes of battery run time they recommend:

Best Price
• Back-UPS RS 800VA 230V India
• APC Back-UPS, 540 Watts /800 VA, Input 230V /Output 230V
• APC Part Number: BR800-IN
• On-battery Waveshape: Stepped Sine Wave

Best Value
• APC Back-UPS 1100, 230V, BS546A, without auto shutdown software, India
• APC Back-UPS, 660 Watts /1100 VA, Input 230V /Output 230V
• APC Part Number: BR1100CI-IN
• On-battery Waveshape: 230 Vrms ± 8% step approximated sine wave

Best Performance
• APC Power-Saving Back-UPS Pro 1500, 230V, India
• APC Back-UPS Pro, 865 Watts /1500 VA, Input 230V /Output 230V, Interface Port USB, Extended runtime model
• APC Part Numbers: BR1500G-IN + (1)BR24BPG-IN
• On-battery Waveshape: Stepped approximation to a sine wave
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July 7, 2013 12:28:28 AM

sir i really appreciate your time and help. thank you very much. and please keep this help to newbies like me.thanks a lot. ok bye .
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