r/buildapc•
Nealz

[Build Help] - Which PSU [850w-1000w] should I take for this build [2-way crossfire]?

USD$

PCPartPicker part list / Price breakdown by merchant / Benchmarks

TypeItemPrice
CPUIntel Core i7-4770K 3.5GHz Quad-Core Processor$329.99 @ Amazon
CPU CoolerPhanteks PH-TC14PE 78.1 CFM CPU Cooler$74.99 @ Newegg
MotherboardAsus Z87-Expert ATX LGA1150 Motherboard$199.98 @ SuperBiiz
MemoryCrucial Ballistix 8GB (4 x 2GB) DDR3-1600 Memory-
StorageSamsung 840 EVO 120GB 2.5" Solid State Disk$99.99 @ Micro Center
Video CardSapphire Radeon R9 290X 4GB Video Card (2-Way CrossFire)-
Video CardSapphire Radeon R9 290X 4GB Video Card (2-Way CrossFire)-
CaseFractal Design Define R4 (Black Pearl) ATX Mid Tower Case$99.99 @ Micro Center
Power SupplyCorsair Professional 750W 80+ Gold Certified Semi-Modular ATX Power Supply$147.94 @ OutletPC
Total
Prices include shipping, taxes, and discounts when available.$952.88
Generated by PCPartPicker 2014-05-18 10:47 EDT-0400

According to Pcpartpicker the estimated part list maximum power draw is 778W (excluding fans and two HDD's), so obivously my HX750w isn't going to cut it. I want to buy a quality, fully modular PSU, but I'm unsure which factors are important in deciding on the wattage (e.g. overclocking, futureproofing).

So should I get a 850w-900w-1000w-1050w PSU? What would you guys recommend and why?

Posted May 19, 2014, 12:04 PM UTC · edited

113
[deleted]•

For 2way-Crossfire/SLI 850W is completely fine and has still room.

Anything above is just wasted on 2way-CF

2
Jontebert•

1000w is very overkill!

1
xplodingboy07•

No it's not. There is nothing wrong with getting a power supply that doesn't get pushed to the end of it's max output. Especially with a couple of 290X's.

3
NealzOP•

So you think the CORSAIR AX 860W would be cutting it to close?

1
xplodingboy07•

It would cover it, but if you plan on doing any overclocking and stuff you will be drawing more than their calculator figures anyway. I'm not really sure why that power supply would be chosen over something like that EVGA for the money though.

1
NealzOP•

Alright I'll probably be going with the EVGA then. You are right in saying I shouldn't skimp on the PSU.

1
Jontebert•

Just saying that he will be just as fine with a 750w one! trust me! it works great for me!

0
xplodingboy07•

That's not very good advice, TBH. It's a bad idea to push a power supply beyond it's limit with over $1,000 worth of hardware connected to it.

3
Jontebert•

I would get an 850w but what would he do with the extra wattage?? nothing.

0