Is 750w enough for my build with overlocking i4690k 4.5Ghz, GTX970-sli and 6 fans running!

Lucas Pie · Feb 18, 2015

This is my 1st build and mainly for Gaming !

CPU Intel Core i5-4690K (Will OC to 4.5Ghz)

Mother broad Asus Maximus VII Hero

GPU ASUS STRIX GTX970 - SLI

RAM Corsair Vengeance Pro 8GB ( 2x4GB ) DDR3 bus 1600 cas 9

HDD Western Digital Black 1 TB

SDD Samsung 850 EVO (250GB)

FAN CPU Thermalright Archon SB-E X2

FAN CASE 2x Corsair Air Series SP120 Performance Edition High Static Pressure 120mm

CASE NZXT H440 White/Black (Already has 4 case fans )

So just like the title, i tend to build a PC that will run an OC i4690k 4.5Ghz, 2 GTX 970 and has 6 fans running (I try to build a PC that can play all the game at HD for the next few years)

Therefore, will a 750w PSU enough for my build ? I'm thinking about this PSU ! Is it a good choice ? Cooler master V750W - 80 Plus Gold

Pr3di · Feb 18, 2015

The Cooler Master V series are Tier 1 PSUs: http://www.tomshardware.co.uk/forum/id-1804779/power-supply-unit-tier-list.html

Since 550W is enough for a build like yours with only one 970, and the 970 consumes max 145W, a 750W PSU of that quality will suffice for your build with a decent OC.

McDuncun · Feb 18, 2015

That is one very decent gaming pc my man, seriously very nice!!! And yes a good quality 750W PSU should be fine for that setup! Just don`t go crapier than CM...

Lucas Pie · Feb 18, 2015

Pr3di :

Glad to hear that cause the shop dealer telling me to get a 850w PSU will be better cause 750w is the minimum requirement ! I really want my PSU to give more than the minimum level required but not overkill !

McDuncun · Feb 18, 2015

Lucas Pie :

Pr3di :

Glad to hear that cause the shop dealer telling me to get a 850w PSU will be better cause 750w is the minimum requirement ! I really want my PSU to give more than the minimum level required but not overkill !

Well in that case you are in the right spot...

badboyrog2 · Feb 18, 2015

just not doing a mistake here..i think the op have a SLI config so 750W is good but no way overkill

photonboy · Feb 18, 2015

1) I recommend a quality 850W.

Your peak power draw is probably about 500W, however that puts you at about 67% load. While that's perfectly fine your FAN NOISE will be higher than a similar quality power supply. Many PSU's start ramping up at 50% load but they're also affected by the HEAT they suck in from the case so with 2x970's the fan will be noisier than with a single 970.

Considering the TOTAL COST of everything and the fact that the 970's run very quiet it's nice to build a system that has all fans running as quiet as possible IMO. I'd have good case fans, and a Noctua NH-U12S cooler or similar using the motherboard fan control software as well to optimize for minimum noise.

You might save roughly $20 or so for a similar 750W PSU but again it will be slightly noisier at times.

2) Recommended PSU (fully modular): http://pcpartpicker.com/part/evga-power-supply-220g20850xr

3) Recommended CPU cooler: Noctua NH-U12S

If you do a light overclock using most BIOS quick overclock methods you can likely achieve 4.2 or 4.3GHz. Probably even manually jump to 4.4GHz whilst not changing other settings like Voltage which keeps the temperature much, much lower. Also 4.5GHz vs 4.2GHz is insignificant usually for gaming.

*Under those conditions the Noctua NH-U12S fan is silent in idle (about 300RPM) and very quiet while gaming. I used the U12S with an i5-4670K which runs slightly hotter (not Haswell Refresh) and it was very quiet even at 100% usage! So I think the Thermaltake cooler is overkill and possibly no benefit.

4) Fans:
IMO x6 case fans is overkill. Maybe in the past it would make a difference but the extra two fans are likely only going to add noise. If the case fans couldn't be controlled and had a bit of noise I'd consider replacing them but otherwise you don't really need to move that much heat out even with 2x970's.

Summary:
I recommend->
a) 850W quality PSU
b) Noctua NH-U12S cooler
c) CPU light overclock in BIOS (no voltage increase)
d) 4xcase fans (fan control)

photonboy · Feb 18, 2015

Update: http://www.tomshardware.com/reviews/best-heat-sink-haswell,3554-23.html

The Thermaltake cooler is slightly louder but I hate the way they setup these graphs. They simply don't represent the real-world since they often run the fan at a fixed speed.

Either way, the Noctua NH-U14S was running the i7-4770K at 4.5GHz under full load at 68degC which is well below the 105degC Tjmax.

*Thus we simply don't need a better cooler. What's the point when it's already well below the maximum while being the 2nd quietest in the list?

DasHotShot · Feb 18, 2015

photonboy :

1) I recommend a quality 850W.

Your peak power draw is probably about 500W, however that puts you at about 67% load. While that's perfectly fine your FAN NOISE will be higher than a similar quality power supply. Many PSU's start ramping up at 50% load but they're also affected by the HEAT they suck in from the case so with 2x970's the fan will be noisier than with a single 970.

Considering the TOTAL COST of everything and the fact that the 970's run very quiet it's nice to build a system that has all fans running as quiet as possible IMO. I'd have good case fans, and a Noctua NH-U12S cooler or similar using the motherboard fan control software as well to optimize for minimum noise.

You might save roughly $20 or so for a similar 750W PSU but again it will be slightly noisier at times.

2) Recommended PSU (fully modular): http://pcpartpicker.com/part/evga-power-supply-220g20850xr

3) Recommended CPU cooler: Noctua NH-U12S

If you do a light overclock using most BIOS quick overclock methods you can likely achieve 4.2 or 4.3GHz. Probably even manually jump to 4.4GHz whilst not changing other settings like Voltage which keeps the temperature much, much lower. Also 4.5GHz vs 4.2GHz is insignificant usually for gaming.

*Under those conditions the Noctua NH-U12S fan is silent in idle (about 300RPM) and very quiet while gaming. I used the U12S with an i5-4670K which runs slightly hotter (not Haswell Refresh) and it was very quiet even at 100% usage! So I think the Thermaltake cooler is overkill and possibly no benefit.

4) Fans:
IMO x6 case fans is overkill. Maybe in the past it would make a difference but the extra two fans are likely only going to add noise. If the case fans couldn't be controlled and had a bit of noise I'd consider replacing them but otherwise you don't really need to move that much heat out even with 2x970's.

Summary:
I recommend->
a) 850W quality PSU
b) Noctua NH-U12S cooler
c) CPU light overclock in BIOS (no voltage increase)
d) 4xcase fans (fan control)

This post!

He is spot on

Lucas Pie · Feb 18, 2015

photonboy :

1) I recommend a quality 850W.

Your peak power draw is probably about 500W, however that puts you at about 67% load. While that's perfectly fine your FAN NOISE will be higher than a similar quality power supply. Many PSU's start ramping up at 50% load but they're also affected by the HEAT they suck in from the case so with 2x970's the fan will be noisier than with a single 970.

Considering the TOTAL COST of everything and the fact that the 970's run very quiet it's nice to build a system that has all fans running as quiet as possible IMO. I'd have good case fans, and a Noctua NH-U12S cooler or similar using the motherboard fan control software as well to optimize for minimum noise.

You might save roughly $20 or so for a similar 750W PSU but again it will be slightly noisier at times.

2) Recommended PSU (fully modular): http://pcpartpicker.com/part/evga-power-supply-220g20850xr

3) Recommended CPU cooler: Noctua NH-U12S

If you do a light overclock using most BIOS quick overclock methods you can likely achieve 4.2 or 4.3GHz. Probably even manually jump to 4.4GHz whilst not changing other settings like Voltage which keeps the temperature much, much lower. Also 4.5GHz vs 4.2GHz is insignificant usually for gaming.

*Under those conditions the Noctua NH-U12S fan is silent in idle (about 300RPM) and very quiet while gaming. I used the U12S with an i5-4670K which runs slightly hotter (not Haswell Refresh) and it was very quiet even at 100% usage! So I think the Thermaltake cooler is overkill and possibly no benefit.

4) Fans:
IMO x6 case fans is overkill. Maybe in the past it would make a difference but the extra two fans are likely only going to add noise. If the case fans couldn't be controlled and had a bit of noise I'd consider replacing them but otherwise you don't really need to move that much heat out even with 2x970's.

Summary:
I recommend->
a) 850W quality PSU
b) Noctua NH-U12S cooler
c) CPU light overclock in BIOS (no voltage increase)
d) 4xcase fans (fan control)

Great answer ! But sadly, i can't find any Noctua Brand in my country !

Can u suggest me a different one ? So that mean 2 more fan will not improving the temp ? About the fan control, do u know any guide source or website about this ? I can only find the fan recommendation ?

photonboy · Feb 20, 2015

Fan control:

1) Download software from motherboard site and install it. One of the programs should have FAN control.

2) Make sure the CPU fan is attached to motherboard "CPU_FAN" slot.

3) Attach the CASE fans to motherboard if possible. Not all fans work so if they connect just try the fan control software.

4) SETTINGS:
Simply use the lowest fan speeds to keep the temperatures where you want them. For example:
a) CPU at lowest speed and ramp up at 40degC, and
b) Case fans at lowest speed and ramp up at 40degC

5) Different CPU cooler?
I don't know what you have access to. The one you linked originally looks fine based on the review I read.

6) Overkill on fans:
YES. Having more than four fans in a setup like yours is definitely overkill. Two intake and two exhaust with fan control setup properly is definitely enough.

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Is 750w enough for my build with overlocking i4690k 4.5Ghz, GTX970-sli and 6 fans running!

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