Power Supply Help Needed

[joe373795]

Hello,

I am requesting some help determining how much wattage power supply I need.

My setup is as follows:
4x4GB GSkill 2133MHz RAM
Antec 900 Case -- 3 front fans, 1 big fan on top, (then I may add side fan later)
Intel LGA2011 3820 CPU -- not overclocked
AsRock Extreme4 Socket LGA2011 Mobo.
AMD HD6850 GPU
128GB SSD
500GB 7200rpm Seagate HDD

I currently have a Corsair 650w that I've had for a 5-6 years.

I would like to add another GPU, I have my eye on either a Nvidia GTX560TI or GTX570.
I also have this power supply laying around that I was thinking of using: http://www.newegg.com/Product/Product.aspx?Item=N82E16817371049&Tpk=antec%20750%20gamer

Will this power supply be enough for the above setup with the added card?
If I decided(after adding the nvidia card) to upgrade the 6850 to a 7970, would the Antec supply still be sufficient? Another future upgrade might be going from 16GB to 32GB of ram.

I suspect having both an Nvidia and AMD card in the same machine might seems a little strange so I will explain. I use GPUs for scientific computing and would like both platforms available in the same machine.

 

[prototype18]

Instead get 7950/7870(Ghz if possible ?)

And if you plan to Cf you need 750W (depends on cards) .

If you are going with single PSU 550W is enough.

So tell me you budget so i can help you better.

 

[joe373795]

Instead get 7950/7870(Ghz if possible ?)

And if you plan to Cf you need 750W (depends on cards) .

If you are going with single PSU 550W is enough.

So tell me you budget so i can help you better.

I don't have a budget, but I don't want to spend more than necessary.

Maybe this will be more clear:

My CURRENT setup is as follows, this is what I am posting from right now:
4x4GB GSkill 2133MHz RAM
Antec 900 Case -- 3 front fans, 1 big fan on top, (then I may add side fan later)
Intel LGA2011 3820 CPU -- not overclocked
AsRock Extreme4 Socket LGA2011 Mobo.
AMD HD6850 GPU
128GB SSD
500GB 7200rpm Seagate HDD
Corsair 650W Bronze

I have this power supply sitting around that I would like to use: http://www.newegg.com/Product/Product.aspx?Item=N82E16817371049&Tpk=antec 750 gamer

I have some upgrades scoped out for the near future, nothing is set in stone, I am actually looking at a few different cards:
1) Upgrading from 4x4GB to 4x8GB of RAM(This for sure).
2a) Adding either a GTX570, or GTX560TI in addition to the HD6850.
2b) Instead of 2a) add a 7970 in addition to the 6850.

 

[ko888]

The Antec High Current Gamer Series HCG-750 750W should be able to power your system configuration when using both a Radeon HD 7970 GHz Edition and a GeForce GTX 570 as long as you don't run FurMark or some equivalent GPU stress testing utility on both cards concurrently.

You need a power supply with at least a combined +12 Volt continuous current rating of 52 Amps or greater when using normal graphics card loads.

If you want your system to be able to survive running FurMark on both GPUs concurrently then you will need a power supply with at least a combined +12 Volt continuous current rating of 70 Amps or greater.

The Antec High Current Gamer Series HCG-750 750W power supply has a combined +12 Volt continuous current rating of 62.5 Amps.

 

[joe373795]

Best answer selected by joe373795.