Stick with my current PSU or change?

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Gingeforlife

Gingeforlife

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Sep 6, 2012
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I am buying a Gigabyte gtx 770(GV-N770OC-2GD) and I am wondering if I should upgrade my PSU.

I currently have a Antec TruePower New TP-550 550W, now using a power calculator and after asking on here it should be good enough (only just though) to run my card and system.

So not wanting to take risks I can currently pick up a COOLER MASTER i700 700w for a VERY good price in my country (far cheaper than anything else in the 600-700 range) and it seems to have some decent reviews.

What do you think?

Other system info:

Mobo: MSI Z77A-G43
CPU: i5 2500k (stock clock and cooler)
Ram: 8gb ddr3 (2x4gb)
GPU: as above
 
Solution
ko888
For a system using a single GeForce GTX 770 graphics card NVIDIA specifies a minimum of a 600 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 42 Amps or greater and that has at least one 6-pin and one 8-pin PCI Express supplementary power connectors.

The Gigabyte GTX 770 WindForce OC 2 GB [GV-N770OC-2GD] draws 19 Amps from the +12V rail(s) when running Furmark and 16 Amps during gaming. The 42 Amps that NVIDIA specifies is grossly over estimated. Realistically they should have specified 35 Amps.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current...
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Shallowmist

Shallowmist

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Nov 7, 2011
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The thing is when you buys something that barely fits than there is no room for expansion. There ain't such thing as overkill. Eventually you will want to add something more, or overclock your system hell even some power fluctuations may happen. In such case would you rather be at the limit or be 200W away from the limit.

That's why my rule of thumb is always at least 25% overhead in case of any upgrades. What happens if u want to add another 770's ? U'd need a different PSU than. If the price is right just buy it. More is better than less. Also yes sme power will be wasted with the 700W but really worried about the power consummation of a power supply ? Not to mention i've had a system that was BEARLY FITTING. Eventually Crysis managed to max everything on it out on 100% work and PSU gave out with a bang. Moral of the story always leave overhead.
 
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thasan1

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Mar 27, 2013
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@Shallowmist there is such thing called overkill. like using a 1000W powersupply on a system that uses 400 watts at full load.
as for the PSU question. you antec should be just enough though on full load it might get fried so it's best if you take a 600 watt PSu like Corsair CX600 or seasonic S12II 620 watt.
 
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Shallowmist

Shallowmist

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Nov 7, 2011
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Overkill depends not on what you do with it now it depends on what you want to do with it later. I didn't say 1000W power supply on a 400W system i said. 25% overhead just in case. So 400W requirement i would pick 600W. Obviously you can overkill but the point is 25% is always a good rule of thumb to avoid future problems. Now if that person wants to upgrade he can add hardware without fear of it burning out. And if you spot 100% fit than it will burn out.
 
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thasan1

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if you put it like this then id have to agree with you.just dont go ovverboard as PSU is most efficient at 70-80% load. so a 600-650 watt PSU would be perfect for him
 
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Shallowmist

Shallowmist

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Agreed however he presented us with a cooler master 700W and i quote "VERY GOOD PRICE in my country". Based on that information the most appropriate choice to change for the better power supply on account of his future/upgrade needs.
 
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Gingeforlife

Gingeforlife

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Sep 6, 2012
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Thanks guys, advice is always welcome and I can see both sides of you points :)

I will take the middle ground and pick up a 600-650w the corsair is a cheap option but I didn't hear many good things about them.
 
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thasan1

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where did you hear that? as far as i know most of corsair PSU's are quite good and reliable though i heard some people with noise issues with CX models other than that they are all good. but if you really want reliable seasonic S12II is a good option though pricer than corsair CX 600.
 
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ko888

ko888

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Feb 18, 2009
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For a system using a single GeForce GTX 770 graphics card NVIDIA specifies a minimum of a 600 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 42 Amps or greater and that has at least one 6-pin and one 8-pin PCI Express supplementary power connectors.

The Gigabyte GTX 770 WindForce OC 2 GB [GV-N770OC-2GD] draws 19 Amps from the +12V rail(s) when running Furmark and 16 Amps during gaming. The 42 Amps that NVIDIA specifies is grossly over estimated. Realistically they should have specified 35 Amps.

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 Antec TruePower New Series 550 Watt (TP-550), with its maximum combined +12 Volt continuous current rating of 45 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 770 graphics card.

Keep your current PSU, it's more than capable of doing the job.
 
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