Enough PSU Power?

[NZpcFirst]

Im am getting a new computer and am settled on all the parts except for the psu because i wonder if it will be enough juice to power my graphics card.

My Build:
Gigabyte GA-Z77-D3H Intel Z77 Ivy Bridge Motherboard
Intel Core i5 2500K Sandy Bridge 3.30GHz 6MB 95W LGA1155
Corsair Hydro Series H80 High Performance Liquid CPU Cooler
CML16GX3M4A1600C9 Vengeance LP 4x4GB DDR3-1600 CL9 (16GB)
Western Digital Caviar Black WD1002FAEX 1TB 64MB Cache SATA3
ASUS BC-12B1ST 12X Blue-ray Combo
Sapphire ATI Radeon HD7870 OC 2GB GDDR5 PCI-E3.0
Corsair Obsidian Series 550D Mid-Tower Quiet Case


Corsair TX650M OR Corsair TX750M
To power a Sapphire ATI Radeon HD7870 OC 2GB GDDR5

 

[amuffin]

TX750m, though why aren't you going custom watercooling? Such as an xspc rasa rx120 or 240 kit

 

[NZpcFirst]

those cooling kits are out of my budget
cuz my budget is 2500 NZD and this build costs about 2464 NZD

 

[amuffin]

Is this for gaming? You don't need 16gb of ram.

 

[NZpcFirst]

yes gaming, its more future-proofing then what is needed

 

[amuffin]

Get 8gb of ram, no point of "future proofing" because games barely use ram.

 

[unksol]

The 7870 is a 120 Watt card. Both those PSUs are massive overkill, especially 750W. A decent 500W PSU would be more than enough

Edit: sorry 140W card. finger slipped. it CAN go up to 175W if you push the power tune limit up though. Still well below 500W for the system.

 

[NZpcFirst]

I just want to run Bf3 at med-high settings and get 60 fps

 

[NZpcFirst]

The 7870 is a 120 Watt card. Both those PSUs are massive overkill, especially 750W. A decent 500W PSU would be more than enough

So imma get a Corsair TX650M then

 

[amuffin]

So imma get a Corsair TX650M then

Will you crossfire? Any possible gpu upgrades? Overclocking?

 

[NZpcFirst]

Will you crossfire? Any possible gpu upgrades? Overclocking?

Not Crossfire but probably will overclock the cpu to 4.2ghz and 1.3V

 

[quilciri]

For a gaming build especially, the wattage on the +12v rail is more important than the total wattage of the PSU. Look at the per-rail ratings of the one you're considering (looks like 12v@XXa). multiply the voltage by the amps to get the wattage of the rail. Compare it to the card's requirements.

Some 400w psu's can handle your system just fine. Some 650w psu's can't.

 

[NZpcFirst]

For a gaming build especially, the wattage on the +12v rail is more important than the total wattage of the PSU. Look at the per-rail ratings of the one you're considering (looks like 12v@XXa). multiply the voltage by the amps to get the wattage of the rail. Compare it to the card's requirements.

Some 400w psu's can handle your system just fine. Some 650w psu's can't.

Technical Specifications

'A dedicated single +12V rail offers simple configuration and maximum compatibility with the latest graphics cards and other components'

 

[NZpcFirst]

Best answer selected by NZPcFirst.

 

[unksol]

Some 400w psu's can handle your system just fine. Some 650w psu's can't.

Since its a corsair though... LOL. still def check. I fixed it above but since we moved so fast.

7870 has been tested to pull around 130W. Default TDP is 140W. IF you push power tune up you can get TDP to 175W and might.hit it with some programs if you plan to overclock, although I doubt it.

As he said check the 12V rating. But its a corsair. when.I say 500W is more than enough I mean on 12V because that's all that matters and how GOOD supplues are labeled, and how corsair labels their. You'll note 636W 53Amps@12Volts on the label of the 650M

 

[PCgamer81]

The quickest way to cause an overclock to become unstable is to have all of your RAM slots filled. I cannot overclock past 4.20GHz, but alas, I need 16GB because I do a lot of multitasking. If this rig is for gaming, exclusively, you will actually be worse off performance wise with 16GB. Vengeance 1600MHz is good and fast, and 8GB is more than enough.

As for your PSU, you need to go with the Antec EarthWatts EA650. Just as the i5 2500k is a no brainer for gaming, so is the EarthWatts for your particular configuration.