How many Watts should I get for my Power Supply?

[kingdomtim]

My friend is selling me 2 AMD Radeon R9 290x's to run crossfire. Which power supply should I get? Which power supply is the bare minimum for these 2 graphics cards?

 

[Math Geek]

you'll want at least 800w for those 2 gpu's.

they are close to 300w each at full load. another 100+ w for the cpu and you'll easily be using a full 800w+ for the system. 850w would be the minimum i would go to be safe.

 

[kingdomtim]

you'll want at least 800w for those 2 gpu's.

they are close to 300w each at full load. another 100+ w for the cpu and you'll easily be using a full 800w+ for the system. 850w would be the minimum i would go to be safe.

So if you run everything at full capacity, 850 watts would be able to handle it?

 

[Math Geek]

i believe so. not knowing the model of 290x the highest power draw i see is about 300w under full load so that's what i based it on. likely you'll use less but better safe than sorry.

i guess i should ask what cpu you will use. a super overclocked 8350 or 9*** series will demand more power. but an i5/i7 even heavily overclocked will still be good to go.

should you be using a high powered amd cpu, then even more power is needed. otherwise the 850w will be enough. something like the solid evga b2 would be ample and semi modular as well.

PCPartPicker part list / Price breakdown by merchant

Power Supply: EVGA 850W 80+ Bronze Certified Semi-Modular ATX Power Supply ($65.99 @ NCIX US)
Total: $65.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-09-02 15:56 EDT-0400

this is a good rebate right now for a solid psu.

 

[kingdomtim]

i believe so. not knowing the model of 290x the highest power draw i see is about 300w under full load so that's what i based it on. likely you'll use less but better safe than sorry.

i guess i should ask what cpu you will use. a super overclocked 8350 or 9*** series will demand more power. but an i5/i7 even heavily overclocked will still be good to go.

should you be using a high powered amd cpu, then even more power is needed. otherwise the 850w will be enough. something like the solid evga b2 would be ample and semi modular as well.

PCPartPicker part list / Price breakdown by merchant

Power Supply: EVGA 850W 80+ Bronze Certified Semi-Modular ATX Power Supply ($65.99 @ NCIX US)
Total: $65.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-09-02 15:56 EDT-0400

this is a good rebate right now for a solid psu.

I am only using a FX-6300 so I should be pretty fine. Thank You for your help.