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New system build need advice

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March 6, 2014 12:14:36 PM

Hello i have been a long time lurker here but this is my first post. I am currently building a new gaming PC for a triple monitor setup. i have all the parts picked out and ready to order but i am a newb when it comes to determining how much power it needs. this PC is strictly for gaming with the possiblity of overclocking. just need help finding the right fully modular PSU that will power this new rig. price needs to be under $300 U.S. dollars. thanks for the help!



CASE: Corsair Obsidian 750D Black ATX Full Tower Computer Case
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CPU: Intel Core i7-4770K Haswell 3.5GHz LGA 1150 84W
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Motherboard: ASUS MAXIMUS VI FORMULA LGA 1150 Intel Z87
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CPU Cooler: CORSAIR Hydro Series H100i
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

PSU: ?????

GPU: SLI (2 cards) EVGA 04G-P4-3776-KR GeForce GTX 770 4GB 256-Bit GDDR5 PCI Express 3.0 SLI Support FTW 4GB Dual w/ EVGA ACX Cooler Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

RAM: G.SKILL Trident X Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 2133 (PC3 17000) Desktop Memory Model F3-2133C9D-16GTX
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

HDD: Seagate Barracuda STBD2000101 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

SSD: PNY XLR8 PRO SSD9SC240GCDA-RB 2.5" 240GB SATA III Internal Solid State Drive
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

OD: Pioneer Black 16X BD-R 2X BD-RE 16X DVD+R 5X DVD-RAM 12X BD-ROM SATA Blu-ray Burner BDR-2209
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

OS: Windows 7

Fans: (2 bottom mount intake fans) Noctua NF-F12 PWM 120mm Case Fan
(case already comes with 3 140mm fans 2 front 1 rear. not replacing these)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Monitors: (3) ASUS VN247H-P Black 23.6" 1ms (GTG) HDMI Widescreen LED Backlight LCD Monitor 250 cd/m2 80,000,000:1 Built-in Speakers
http://www.newegg.com/Product/Product.aspx?Item=N82E168...



Thanks for any help yall can provide. im not worried about looks in this case at all. being quiet is a plus but not a necessity. just need proper wattage PSU. also any thoughts about my build so far is welcome. I dont think im missing anything i hope. I'm always open to constructive criticism. Thanks!


More about : system build advice

March 6, 2014 12:35:05 PM

You GPU's are going to draw a lot of power. 1000 watts would be what you want to get. Anything less could be possible, but i wouldn't suggest it. This PSU below is a great power supply, and is the best option.

EDIT:

Each 770 will consume about 193 watts under a gaming load, and the 4770k will consume 84 watts. These together can consume about 470, but to be safe, round it up to 500 watts.

The liquid cooling will consume roughly 50 to 100 watts, and throw in another 100 watts for overclocking everything.
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March 6, 2014 12:51:25 PM

HiTechObsessed said:
What are you talking about? A pair of 770s in SLI will use around 550w or so under full load: http://www.anandtech.com/show/7492/the-geforce-gtx-780-...

While that is a great PSU, it is EXTREME overkill for this setup.


Sorry, read the post wrong, but you would still need something above 850 watts if you expect to overclock.

**Also, I was looking at the efficiency. While a gold or platinum efficient PSU is great, it may or may not be worth the extra money.
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a c 284 4 Gaming
March 6, 2014 12:54:15 PM

No you don't. The link I sent you is from an overclocked i7 extreme CPU, and the entire system with 770s in SLI at full synthetic load doesn't even pass 550w. 750w would even be fine. I recommended 850 for longevity purposes.

And the 4770k only uses about 60-65 watts of power when a dedicated GPU is used, as it shuts off the iGPU. Your edit above is much more correct, and proves 850w, even 750w, is plenty.
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March 6, 2014 1:03:03 PM

HiTechObsessed said:
No you don't. The link I sent you is from an overclocked i7 extreme CPU, and the entire system with 770s in SLI at full synthetic load doesn't even pass 550w. 750w would even be fine. I recommended 850 for longevity purposes.

And the 4770k only uses about 60-65 watts of power when a dedicated GPU is used, as it shuts off the iGPU. Your edit above is much more correct, and proves 850w, even 750w, is plenty.


I forgot about the iGPU in the 4770k. Also how much power would the liquid cooling draw? I was guessing at about 50 to 100 watts. Also, how much does efficency matter? *Sorry, but I'm 14 and kinda new to this stuff :) 

This link is what I was using.
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a c 284 4 Gaming
March 6, 2014 1:33:10 PM

No problem, we were all new once :)  Efficiency for normal/gaming computing really doesn't mean anything. It is *generally* a sign of a higher quality product, but not always. Efficiency only matters when you're doing something like crypto-currency mining, or companies buying for dozens or hundreds of computers or so.

And the H100i uses relatively little power. Fans only use about 5-7 watts each, and the pump maybe a tad more. Generally speaking, you take the TDP of the card(s) add the TDP of the CPU, then add 250w or so for everything else, which includes motherboard, fans, moderate overclocking, etc to get PSU recommendation (This is how I do it). The 250w gives plenty of room for everything, including overclocking, and gives room for upgrades like HDD, SSDs, wifi cards, fans, etc, while allowing for deterioration as well, to get a power supply that will last a long time.

And to add, don't ever use online power supply calculators. Almost every single one vastly overstates what is actually needed for a system.
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March 6, 2014 1:52:42 PM

Thank you so much for yalls advise. I like the Power supplies that were recommended. I did some more research and I'm going with the corsair ax860i. This helped me narrow it down to wattage needed. I just learned a few things to thx. Who knows I may still go with that seagate.
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a c 284 4 Gaming
March 6, 2014 2:06:34 PM

The AX line is a great product from Corsair, great choice :) 
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