How much power do I need?

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Gam3Pwn3rz

Gam3Pwn3rz

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Nov 5, 2013
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I am putting together a build that I am going to save my money towards and I am wondering if this power supply is enough to power the entire build. I will probably be overclocking if that comes into play here.

CPU- FX-8350
CPU Cooler- Corsair H100i
Motherboard- Asus m5a99fx Pro R2.0
RAM-G.Skill Ares Series 8GB (2 x 4GB) DDR3-1866
GPU- Gigabyte GeForce GTX 770 2GB Video Card (2-Way SLI)
Case- NZXT Phantom 410
PSU- EVGA SuperNOVA NEX750B BRONZE 750W

Any advice would be appreciated.

PC Part Picker link: http://pcpartpicker.com/p/2lLYb
 
Solution
Sangeet Khatri
A few changes :

1. If you are going to overclock, then the 8320 is equivalent to the 8350, since everything except clockspeeds are same. Hence 8320 at $130 is a much cheaper and viable option.

2. Phanteks PH-TC14PE CPU Cooler performs the same and sometimes better than the Corsair H100i, but it is a lot more quieter and hence it will help with the noise.

3. G.Skill Sniper RAM : It is cheaper and better, so there was no reason why to not add them.

4. Antec HCG Gamer 850W PSU replaced EVGA PSU. First of all since you are overclocking and doing 770 SLI, hence you might go above 750W, hence 850W PSU should be the one to go for. Another thing is that Antec's HCG PSU is much better than EVGA's Supernova series.

5. Fractal Design Define...
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Would it be good to have an 800-850 watt PSU?
 
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you did not list your hard drives. i am assuming 1xhdd, 1xssd and i threw in 6 high perf fans. at a 4.1ghz/1.55v overclock the system with a single 770 gpu would use about 624w at 100% complete theoretical load. with two 770 in sli it would be 807w at 100% complete theoretical load.

keep in mind that outside of stress testing you arent going to get a 100% load. also even in stress testing getting 100% load is not something you will typically ever see.

if you have a single gtx770: your psu is fine.
if you have two gtx770 in sli: you are likely fine for mild overclocking however i would suggst an 850w psu at least

edit: i agree with the other guy... a 950 or 1000w is best.

again... theretical maximums and actual usage are different. you will be using much less however you want to keep the maximum in mind so that you dont underbuy. of course if you never come close to maximums you can make do with a lower watt psu but its taking a chance and i dont take chances myself.
 
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let's compute shall we?

2x230W for gpu's
1x125W for cpu
100W everything else and that's generous of me, very generous
=685W - so even 750 SHOULD be enough

a 25% standard headroom is not uncommon and it's not nice to drive psu-s close to their limit. that would be ~850-900 but 1000W is such a nice number 😀
 
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i know, you're right, i was trying to explain to him that the psu is the last place to cut corners when building a pc. you can almost never have such a thing as overkill psu.
 
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well... overkill would be a 1000w psu if your system demand is less than 500w.... but going with something larger isnt going to hurt your system. going with something too small will.

i agree that something around 850 might work (if he keeps his overclocks very mild) however 950-1000 gives him the headroom required to do pretty much anything.
 
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A few changes :

1. If you are going to overclock, then the 8320 is equivalent to the 8350, since everything except clockspeeds are same. Hence 8320 at $130 is a much cheaper and viable option.

2. Phanteks PH-TC14PE CPU Cooler performs the same and sometimes better than the Corsair H100i, but it is a lot more quieter and hence it will help with the noise.

3. G.Skill Sniper RAM : It is cheaper and better, so there was no reason why to not add them.

4. Antec HCG Gamer 850W PSU replaced EVGA PSU. First of all since you are overclocking and doing 770 SLI, hence you might go above 750W, hence 850W PSU should be the one to go for. Another thing is that Antec's HCG PSU is much better than EVGA's Supernova series.

5. Fractal Design Define R4 case : It is feature rich, really quiet and have good thermals as it is quite cool too. Hence, since this is available for about the same price, hence I opted for this case. Though the final choice is yours. Be free to change it according to your liking.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-8320 3.5GHz 8-Core Processor ($139.99 @ Newegg)
CPU Cooler: Phanteks PH-TC14PE_BK 78.1 CFM CPU Cooler ($76.99 @ Newegg)
Motherboard: Asus M5A99FX PRO R2.0 ATX AM3+ Motherboard ($126.98 @ SuperBiiz)
Memory: G.Skill Sniper 8GB (2 x 4GB) DDR3-1600 Memory ($73.98 @ OutletPC)
Video Card: Gigabyte GeForce GTX 770 2GB Video Card (2-Way SLI) ($329.98 @ SuperBiiz)
Video Card: Gigabyte GeForce GTX 770 2GB Video Card (2-Way SLI) ($329.98 @ SuperBiiz)
Case: Fractal Design Define R4 w/Window (Black Pearl) ATX Mid Tower Case ($89.99 @ Microcenter)
Power Supply: Antec HCG M 850W 80+ Bronze Certified Semi-Modular ATX Power Supply ($89.99 @ NCIX US)
Total: $1257.88
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-17 12:59 EST-0500)

Have fun :)
 
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Solution


Thanks for the reply! I am going to use this post to edit my current build.
 
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gtx 770 are capable of hitting 250w each (although for short durations and very rarely will this happen however you still need to plan for it. that is 500w right there. an overclocked 8320 can draw upwards of 200w (in some cases more). that brings ups up to 700w. then add in all of the other components.

total draw (theretical maximums) are around 800w. therefore an 850w would work however it would be better to have a bit more headroom than +/- 50w. yes, the actual draw of the system will be much less than 800w 99.9999% of the time but we plan for the absolute worst case scenario to avoid "incidents". thats why we suggested a bigger psu with the note that a 850 "would" work but that going bigger would give a larger buffer zone. 1000w units go on sale for the price of 750w units all the time so price isnt a huge factor.

i agree that an 8320 is a better choice if you plan on overclocking.

the phantek cooler listed might also be quieter (it has no pump) however the benefit of the h100i (or other cpu loops) is that it allows you to relocate the bulk of the cooler off the motherboard and onto a side panel somewhere as the big air coolers tend to be rather large.

another case to look at in the budget is the corsair 500r

personally i'd go with a good seasonic or xfx psu (both are made by seasonic who pretty much does no wrong when it comes to psus)... but i've heard decent things about some antecs
 
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1. Antec HCG Gamer Series is made by Seasonic.

2. The system would barely go above 700W. The extra 150W is plenty for providing overclocking headroom.

3. I personally prefer the Fractal Design Define R4 over the Corsair 500R, but yeah, it depends on the end user's liking.
 
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