GTX 750Ti Power Requirements

[bilalafzal50]

Guys, i am buying gtx 750 Ti from a friend in a few weeks but i need to know something. The power requirement of the card is 400W but I have 350W psu. He says it will work fine but i'm curious that my system will be at risk (won't it?). And my CPU is core i5-3570k ~ 3.4GHz, 4 gig ram.
Any help will be appreciated.

 

[nikoli707]

what make and model is your 350w power supply? as long as it is decent quality from a good tiered manufacture, it will work fine. wattage doesn't matter much, its the amperage on the 12 volt rail that matters. anything 20 amps and above will work fine.

 

[LVL1234]

I personally have a EVGA FTW 750Ti and It draws a max of 75-100 watts even when I am gaming, you should and I say SHOULD have adiment power but it further depends on what games you are playing...
Thanks.

 

[Dark Lord of Tech]

Guys, i am buying gtx 750 Ti from a friend in a few weeks but i need to know something. The power requirement of the card is 400W but I have 350W psu. He says it will work fine but i'm curious that my system will be at risk (won't it?). And my CPU is core i5-3570k ~ 3.4GHz, 4 gig ram.
Any help will be appreciated.

Just make sure it's not a version with the 6 pin.

 

[nukemaster]

In a technical term computer power supplies have more than one voltage.

The common ones are 12 5 and 3.3

The reason you need to know the amperage rating per rail is because modern hardware places more demand on the 12 volt rail. Older/ cheaper power supplies had more power on the 5 and 3.3 volt rail. This is not the case any more. Quality power supplies generate a large 12 volt rail and get the secondary rails with dc-dc converters. This allows lots of 12 volt power and a good bit of 5 and 3.3 volt current for hardware that may still need it. You also have standby and negative rails that are a part of your total wattage.

It is not that wattage does not matter, but distribution matters more. Also note that power supplies can not deliver the full rated 12 volt current if the 5 and 3.3 volt rails are loaded to the max since they get power from the 12 volt rail on modern designs. This is almost never an issue, but that IS the reason you have a total wattage rating of ALL rails as well as a combined rating for multi-rail units(the rails almost always come from the same large 12 volt rail and it has only so much current).

This DC-DC conversion process is also very efficient and helps overall efficiency of the power supply.

I have been running a GTX 650ti(rated at higher current draw than the 750ti) since they came out with a 300 watt unit(22A(264w) @ 12 volts). I have it in a very power friendly system as well.

Short answer, lets see the power supply model number.

 

[Dark Lord of Tech]

And if it's a prebuilt and doesn't have a UEFI BIOS it may not run the card.

 

[bilalafzal50]

what make and model is your 350w power supply? as long as it is decent quality from a good tiered manufacture, it will work fine. wattage doesn't matter much, its the amperage on the 12 volt rail that matters. anything 20 amps and above will work fine.

It's certainly not from a good manufacturer i checked the psu and its 28V.

 

[bilalafzal50]

In a technical term computer power supplies have more than one voltage.

The common ones are 12 5 and 3.3

The reason you need to know the amperage rating per rail is because modern hardware places more demand on the 12 volt rail. Older/ cheaper power supplies had more power on the 5 and 3.3 volt rail. This is not the case any more. Quality power supplies generate a large 12 volt rail and get the secondary rails with dc-dc converters. This allows lots of 12 volt power and a good bit of 5 and 3.3 volt current for hardware that may still need it. You also have standby and negative rails that are a part of your total wattage.

It is not that wattage does not matter, but distribution matters more. Also note that power supplies can not deliver the full rated 12 volt current if the 5 and 3.3 volt rails are loaded to the max since they get power from the 12 volt rail on modern designs. This is almost never an issue, but that IS the reason you have a total wattage rating of ALL rails as well as a combined rating for multi-rail units(the rails almost always come from the same large 12 volt rail and it has only so much current).

This DC-DC conversion process is also very efficient and helps overall efficiency of the power supply.

I have been running a GTX 650ti(rated at higher current draw than the 750ti) since they came out with a 300 watt unit(22A(264w) @ 12 volts). I have it in a very power friendly system as well.

Short answer, lets see the power supply model number.

IP-P350AJ2-0 Is it fine? Thanks for the help

 

[Dark Lord of Tech]

http://www.newegg.com/Product/Product.aspx?Item=N82E16817103105
+12V@18A,

It's a little light on power.

A GeForce GTX 750ti needs 20 amps on the 12v+ rail and a 350w to 400w power supply.

 

[bilalafzal50]

http://www.newegg.com/Product/Product.aspx?Item=N82E16817103105
+12V@18A,

It's a little light on power.

A GeForce GTX 750ti needs 20 amps on the 12v+ rail and a 350w to 400w power supply.

So it wont work?

 

[Dark Lord of Tech]

It's a little light on power , could use a stronger rail.

 

[bilalafzal50]

It's a little light on power , could use a stronger rail.

Ok thanks for the help btw.

 

[Dark Lord of Tech]

No problem !

 

[nednerbish]

If it is a prebuilt pc the msi model has a legacy switch you can use to get around the bios issue. I had to run mine in legacy mode as I popped it into a HP P7 but also had to buy a corsair 430W psu for it. I was really amazed that my pc can play every game (except dayz) with really decent fps. Even Metro last light redux.