GTX 770 on a 12V ? Or is Wattage important?

[RulesSpew]

Hey

I heard some stuff about the V ramp and so on.

What's all this thingy about this V12 ramp?

Can I just run my GTX 770 on a 550W PSU? Or is that V ramp thingy important, please explain!

Thanks

 

[bigpinkdragon286]

http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-770/specifications

NVIDIA recommends you run a GTX 770 on a 600 watt power supply.

Can you run a GTX 770 on a 550 watt PSU? Maybe. Can your 550 watt power supply sustain 25 amps on the 12 volt rail, after supplying the necessary amperage to the CPU? While the GTX 770 might not draw anywhere near a constant 25 amps, if it ever drew from the motherboard, 6-pin, and 8-pin power connectors the max allowed, it could get close, at which point you will experience less than desired results. Your mileage is going to vary, as not all power supplies are made equal.

 

[VolvoDoto]

What is your psu? A decent 550w is enough for a gtx 770

 

[RulesSpew]

http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-770/specifications

NVIDIA recommends you run a GTX 770 on a 600 watt power supply.

Can you run a GTX 770 on a 550 watt PSU? Maybe. Can your 550 watt power supply sustain 25 amps on the 12 volt rail, after supplying the necessary amperage to the CPU? While the GTX 770 might not draw anywhere near a constant 25 amps, if it ever drew from the motherboard, 6-pin, and 8-pin power connectors the max allowed, it could get close, at which point you will experience less than desired results. Your mileage is going to vary, as not all power supplies are made equal.

Yeah, nvidia allways recommend more W psu's :/
I'm a bit worried about the amp thingy, I'm afraid of getting a 750W psu for example that won't have enough amps for my graphics card.

However I'm looking for a Seasonic G 550W, that has 12V / 12V two ramps or something like that.

 

[VolvoDoto]

Gtx 770 will run on a Seasonic G 550w no sweat, even when OCed.

 

[qbsinfo]

Yeah, nvidia allways recommend more W psu's :/
I'm a bit worried about the amp thingy, I'm afraid of getting a 750W psu for example that won't have enough amps for my graphics card.

However I'm looking for a Seasonic G 550W, that has 12V / 12V two ramps or something like that.

well recommendations are ALWAYS high because "they" never know what components are in your system; ie an overclocked 8350 can use ~100 watts more than an OC'd i7/i5. also thrown in a handful of fans and water cooling, wireless card and/or sound card, a few spare hard drives - not that drastic but noticeable - and you could be looking at 150 - 200 watts in difference between two systems.

a general rule of thumb is any decent PSU ough to have atleast 80% of its rated wattage supllied off the 12 volt rail. a 500 ought to have 400 of 12 volts, ect. most all good PSUs can supply much more. also, FYI, don't let those mutli rail PSUs throw you off. for instance a 750 watt PSU might say it has two 30 amp 12 volt rails (720 watts). that sounds great but those are actually when the protection for each individual rail kicks in. look on the label and you see a MAX POWER for both rails combined. it could say something like 600 watts therefore making the actual 12 volts 50 amps (or technically 25 each when both are used).

had enough?

 

[RulesSpew]

Yeah, nvidia allways recommend more W psu's :/
I'm a bit worried about the amp thingy, I'm afraid of getting a 750W psu for example that won't have enough amps for my graphics card.

However I'm looking for a Seasonic G 550W, that has 12V / 12V two ramps or something like that.

well recommendations are ALWAYS high because "they" never know what components are in your system; ie an overclocked 8350 can use ~100 watts more than an OC'd i7/i5. also thrown in a handful of fans and water cooling, wireless card and/or sound card, a few spare hard drives - not that drastic but noticeable - and you could be looking at 150 - 200 watts in difference between two systems.

a general rule of thumb is any decent PSU ough to have atleast 80% of its rated wattage supllied off the 12 volt rail. a 500 ought to have 400 of 12 volts, ect. most all good PSUs can supply much more. also, FYI, don't let those mutli rail PSUs throw you off. for instance a 750 watt PSU might say it has two 30 amp 12 volt rails (720 watts). that sounds great but those are actually when the protection for each individual rail kicks in. look on the label and you see a MAX POWER for both rails combined. it could say something like 600 watts therefore making the actual 12 volts 50 amps (or technically 25 each when both are used).

had enough?

that's what I've wanted to hear!
Thanks