PSU confusions (correct wattage)

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Faze Savage

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Dec 29, 2016
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My computer requires 1000w. I was thinking about getting an AX 1200i instead of a RM 1000. Is it worth it? Also, is it safe to plug a 1200 watt psu into a surge protector or the wall.
 
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Karadjgne
That would be 1k. At least 875w plus the additional drives not normally seen in most builds puts it north of @950w, so 1k - 1.2k is good. While personally not the biggest fan of Corsair, it's very hard to argue against the AXi 1200, when it fits wattage criteria. Other than price. The HXi1200 or Evga 1200 P2 would also be good choices, although not mentioned.
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4745454b

4745454b

Titan
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Apr 29, 2006
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Something a lot of people do is miscalculate how much power they really need. They read a review on their favorite GPU and mistake system draw for the draw of the GPU. So if the system draw is 400W, and they are running two cards they think they need 800W just for the GPUs. System draw isn't for the GPU though, it's for the system.

"Most" GPUs top out at 300W. There are a few that draw more but 300W is the normal max. Two of those in CF/SLI is 600W, add another 150W for the CPU and rest of the system. Again, there are some CPUs that are 140-225W, but most CPUs will be <100W. 600+150W= 750W, and that's assuming high end hardware. Two 1070s (200W each) and a 7700 is barely 600W total.

Generally a 500-550W unit will be enough for a single card setup, and a good 750W will handle most 2 way CF/SLI setups. There are cases where you need a lot more if you are using 140-225W CPUs, 375W GPUs, and/or you are OCing everything farther. But in general I'd be surprised if you even need a 1kW PSU.
 
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4745454b

4745454b

Titan
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Apr 29, 2006
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With that setup I'd go 1.2kW or larger. You basically have three 300W devices there, or a load of ~900W. 1kW can barely cover that. It would be running at 90% of it's rated output. A 1.2kW would be back down to an acceptable 75% of output and that's much better.

That's why I said it's possible he needs a PSU that much, but he probably doesn't.
 
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4745454b

4745454b

Titan
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Apr 29, 2006
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Using my mod powers this is what he claims to have. (taken from a different thread.)

X99 FTW K, Intel X99 Chipset, LGA 2011-3, DDR4 128GB, M.2, USB 3.1, E-ATX Retail Motherboard
Core i7-5820K Six-Core 3.3 - 3.6GHz TB, LGA 2011-3, 15MB L3 Cache, DDR4, 22nm, 140W, Retail Processor
2 x 16GB Kit (4 x 4GB) Value DDR4 2133MHz, PC4-17000, CL15 (15-15-15) 1.2V, Non-ECC, Black, DIMM Memory
SuperNOVA Series 850 B2 850W, 80 PLUS Bronze, Semi Modular, ATX Power Supply
CMQ2-2.7G, 2.7g, Ceramique 2 Tri-Linear Ceramic, Thermal Compound
128GB 600p 2280, 770 / 450 MB/s, 3D NAND TLC, PCIe 3.0 x4 NVMe, M.2 SSD
2 x 120GB CS1311 7mm, 550 / 510 MB/s, TLC, SATA 6Gb/s, 2.5-Inch Retail SSD
3 x 500GB DT01ACA050, 7200 RPM, SATA 6Gb/s, 32MB cache, 3.5-Inch OEM HDD
iHAS124-14, DVD 24x / CD 48x, DVD-Writer, SATA, 5.25-Inch, Black, OEM Optical Drive
ARCHER T8E, Internal, IEEE 802.11a/ac/b/g/n, Dual-Band 2.4 / 5GHz, 450 / 1300 Mbps, PCI Express 2.0 x1, Retail Wireless Adapter
Fans : 3 x 200mm ThermalTake Luna Series
3 x 140mm Corsair ML Red Led Pro (ML140 Pro)
CPU Cooler : PHANTEKS PH-TC14P
GPU(s) : 2 x MSI Radeon RX 480 GAMING X 4G
Click to expand...

I see the OC'd CPU, and the GPUs I'm less sure of. Looking at his threads he was considering a 3 way 970 setup, or a two way 1070 setup. Then out of the blue he has the CF 480s. Assuming he OC's those, his CPU and GPUs I'm guessing to run around 750W or so, maybe more depending on how much voltage he needed. Not sure why he decided to go with 6 small harddrives but he did. His total system draw is probably just north of 800W, which is why to high for that 850W unit he listed. It would be above 80% of a 1kW unit as well. This is one of those cases I/we mentioned earlier where a 1.2kW PSU is suggested. Assuming that's his system.
 
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Karadjgne

Karadjgne

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Dec 26, 2012
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Agreed. With the quality parts and size of the build, the AXi 1200 would be a good investment, more so than the RM1000. You could get away with the RM1000, chances of maxing out the system total wattage is slim, average gaming draw should be @700w at best, but that's still high usage, heat, stress etc. Makes for noisy fans.
 
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F

Faze Savage

Commendable
Dec 29, 2016
23
0
1,510
My specs are Phantom Series 530 w/ Window, No PSU, E-ATX, Red, Full Tower Case
Z170 Classified 4-Way, Intel Z170 Chipset, LGA 1151, DDR4 64GB, HDMI, M.2, USB 3.1, E-ATX Retail Motherboard
Core i7-6700K Quad-Core 4.0 - 4.2GHz TB, HD Graphics 530, LGA 1151, 8MB L3 Cache, DDR3L / DDR4, 14nm, 91W, Retail Processor
16GB Kit (4 x 4GB) Value DDR4 2133MHz, PC4-17000, CL15 (15-15-15) 1.2V, Non-ECC, Black, DIMM Memory

CMQ2-2.7G, 2.7g, Ceramique 2 Tri-Linear Ceramic, Thermal Compound
3 x MegaFlow 200mm w/ Red LEDs, 700 RPM, 110 CFM, 19 dBA Cooling Fan
120GB SSDNow 2280, 550 / 200 MB/s, MLC, SATA 6Gb/s, M.2 SSD
3 x 120GB CS1311 7mm, 550 / 510 MB/s, TLC, SATA 6Gb/s, 2.5-Inch Retail SSD
3 x 500GB DT01ACA050, 7200 RPM, SATA 6Gb/s, 32MB cache, 3.5-Inch OEM HDD
iHDS118-04, DVD 18x / CD 48x, DVD-ROM, SATA, 5.25-Inch, Black, OEM Optical Drive
DWA-582, Internal, IEEE 802.11ac/b/g/n, Dual-Band 2.4 / 5GHz, 300 / 866 Mbps, PCI Express 2.0 x1, Retail Wireless Adapter
GTX 780 ti (2x in SLI)
 
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Karadjgne

Karadjgne

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Dec 26, 2012
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That would be 1k. At least 875w plus the additional drives not normally seen in most builds puts it north of @950w, so 1k - 1.2k is good. While personally not the biggest fan of Corsair, it's very hard to argue against the AXi 1200, when it fits wattage criteria. Other than price. The HXi1200 or Evga 1200 P2 would also be good choices, although not mentioned.
 
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