What PSU power does my system require?

[Gdourado]

Hello, how are you?

I currently have a XFX Pro black series 850w psu on my system.

the system runs good and I like the psu.

but my case is a Bitfenix prodigy and the psu has a hard time fitting in there.

So I am looking to go for a shorter non modular psu.

but 140,mm PSUs come in 750w gold rated tops.

 

is 750w enough for the system to be stable and not at top psu load?

this is my current system?

 

Asus Maximus VIII impact

I5 6600k at 4.8

2x8gb corsair ddr4 

noctua nh-d14 with 3 fans total

spectre pro 230mm fan

1 Samsung 840 evo ssd

2x 2tb toshiba 3.5 7200rpm hdd

sapphire 390X Tri-X oc

 

i currently run these voltages:

vcore 1.4

vccio 1.2

system agent 1.25

vdimm 1.35

 

390x runs 1160 core and 6800 memory.

power limit to +50

core voltage to +30mv

 

Is it safe to downgrade the psu?

I would also like to have a good margin for future upgrades.
But I don't intend to go larger than itx or go for more than one GPU in the future.

what are your thoughts?

 

Thanks.

cheers!

[AManWithPlan]

Input all of your specs into PCPartPicker and it will give you your peak wattage. This will not incorporate overvolting/clocking.

[Marziman]

That's a pretty low wattage system, I think 750Watts would be more than enough

[TidaLWaveZ]

You're Vcore is high.

[don_svetlio]

600W is all you will ever need with a single 390X OCed to the max

[AManWithPlan]

If you are one of those crazies (like me) you need to research your PSU's peak efficiency (somewhere between 91%-94%) and at what load this peak efficiency is achieved.

 

As an example, my PSU's peak efficiency is between 550-700 watts and that is exactly what I run. The selection of my PSU was to hit that efficiency sweet spot. Anything inefficient produces more heat, wastes power, and does negligible wear and tear to your PSU that is unnecessary.

[STRMfrmXMN]

3 hours ago, Gdourado said:

Hello, how are you?

I currently have a XFX Pro black series 850w psu on my system.

the system runs good and I like the psu.

but my case is a Bitfenix prodigy and the psu has a hard time fitting in there.

So I am looking to go for a shorter non modular psu.

but 140,mm PSUs come in 750w gold rated tops.

 

is 750w enough for the system to be stable and not at top psu load?

this is my current system?

 

Asus Maximus VIII impact

I5 6600k at 4.8

2x8gb corsair ddr4 

noctua nh-d14 with 3 fans total

spectre pro 230mm fan

1 Samsung 840 evo ssd

2x 2tb toshiba 3.5 7200rpm hdd

sapphire 390X Tri-X oc

 

i currently run these voltages:

vcore 1.4

vccio 1.2

system agent 1.25

vdimm 1.35

 

390x runs 1160 core and 6800 memory.

power limit to +50

core voltage to +30mv

 

Is it safe to downgrade the psu?

I would also like to have a good margin for future upgrades.
But I don't intend to go larger than itx or go for more than one GPU in the future.

what are your thoughts?

 

Thanks.

cheers!

Short and non-modular? I used to own a Prodigy and found that semi-modularness had no problems fitting in there with a Corsair CS. I'd recommend a Seasonic S12 if that fits your case well.

[Gdourado]

20 hours ago, TidaLWaveZ said:

You're Vcore is high.

Hello,

What Vcore should I set?

The system is currently 100% stable at these values.

 

20 hours ago, don_svetlio said:

600W is all you will ever need with a single 390X OCed to the max

I did a calculation here:

http://outervision.com/power-supply-calculator

 

And it gave me a result of 570W.

Isn't 600W a little on the short side?

 

19 hours ago, AManWithPlan said:

If you are one of those crazies (like me) you need to research your PSU's peak efficiency (somewhere between 91%-94%) and at what load this peak efficiency is achieved.

 

As an example, my PSU's peak efficiency is between 550-700 watts and that is exactly what I run. The selection of my PSU was to hit that efficiency sweet spot. Anything inefficient produces more heat, wastes power, and does negligible wear and tear to your PSU that is unnecessary.

How can I do such calculations?

 

Also, after much research, I decided to go for a Silverstone PSU with the PP05-E short cable kit.

The cable kit features short cables and flat cables so they sould be easier to bend and route than a non modular PSU.

Also, the silverstone units are 150mm deep, so they should work on a Prodigy.

Anyone here uses such a psu on a Prodigy case?

 

Also, regarding the choices, I am torn between:

SST-ST75F-GS Strider Gold Series - 750 Watt - 110 Euros
+3,3V: 22 A
+5V: 25 A
3,3+5V: 150 W
+12V: 62 A (744 W)
-12V: 0,3 A (3,6 W)
+5Vsb: 3,5 A (17,5 W)

or...

SST-ST85F-GS Strider Gold Series - 850 Watt - 145 Euros
+3,3V: 22 A
+5V: 25 A
3,3+5V: 150 W
+12V: 70 A (840 W)
-12V: 0,3 A (3,6 W)
+5Vsb: 3,5 A
 

Is the 750W model enough and safe for OC?

Also, how do yoy think future cards will be in regard to power consuption? Pascal or future amd cards?

Will they be more energy efficient? Even future top tier cards?

Or will they require more power than a current 390X?

I ask because I want to get the PSU right this time and be able to safely upgrade in the future without having to swap PSU again.

 

Thanks.

Cheers!

[ClobberXD]

21 hours ago, Gdourado said:

Hello, how are you?

I currently have a XFX Pro black series 850w psu on my system.

the system runs good and I like the psu.

but my case is a Bitfenix prodigy and the psu has a hard time fitting in there.

So I am looking to go for a shorter non modular psu.

but 140,mm PSUs come in 750w gold rated tops.

 

is 750w enough for the system to be stable and not at top psu load?

this is my current system?

 

Asus Maximus VIII impact

I5 6600k at 4.8

2x8gb corsair ddr4 

noctua nh-d14 with 3 fans total

spectre pro 230mm fan

1 Samsung 840 evo ssd

2x 2tb toshiba 3.5 7200rpm hdd

sapphire 390X Tri-X oc

 

i currently run these voltages:

vcore 1.4

vccio 1.2

system agent 1.25

vdimm 1.35

 

390x runs 1160 core and 6800 memory.

power limit to +50

core voltage to +30mv

 

Is it safe to downgrade the psu?

I would also like to have a good margin for future upgrades.
But I don't intend to go larger than itx or go for more than one GPU in the future.

what are your thoughts?

 

Thanks.

cheers!

Man, a 650W PSU will be perfect, if not more than enough. If you plan on getting more graphics cards, then 750W is fine, but for you current setup, I repeat, 650W is more than enough. Trust me...

[TidaLWaveZ]

1 hour ago, Gdourado said:

Hello,

What Vcore should I set?

The system is currently 100% stable at these values.

 

I did a calculation here:

http://outervision.com/power-supply-calculator

 

And it gave me a result of 570W.

Isn't 600W a little on the short side?

 

How can I do such calculations?

 

Also, after much research, I decided to go for a Silverstone PSU with the PP05-E short cable kit.

The cable kit features short cables and flat cables so they sould be easier to bend and route than a non modular PSU.

Also, the silverstone units are 150mm deep, so they should work on a Prodigy.

Anyone here uses such a psu on a Prodigy case?

 

Also, regarding the choices, I am torn between:

SST-ST75F-GS Strider Gold Series - 750 Watt - 110 Euros
+3,3V: 22 A
+5V: 25 A
3,3+5V: 150 W
+12V: 62 A (744 W)
-12V: 0,3 A (3,6 W)
+5Vsb: 3,5 A (17,5 W)

or...

SST-ST85F-GS Strider Gold Series - 850 Watt - 145 Euros
+3,3V: 22 A
+5V: 25 A
3,3+5V: 150 W
+12V: 70 A (840 W)
-12V: 0,3 A (3,6 W)
+5Vsb: 3,5 A
 

Is the 750W model enough and safe for OC?

Also, how do yoy think future cards will be in regard to power consuption? Pascal or future amd cards?

Will they be more energy efficient? Even future top tier cards?

Or will they require more power than a current 390X?

I ask because I want to get the PSU right this time and be able to safely upgrade in the future without having to swap PSU again.

 

Thanks.

Cheers!

If everything is stable and your temps are fine then it's not really an issue, but 1.4v is a little above my 24/7 comfort range especially if you're air cooling.  Intel recommends not going over 1.3v, my 5820k is at 4.5ghz on 1.2v.  Just make sure you're not exceeding 80c on load and there shouldn't be a problem.

[TheCaptain53]

23 minutes ago, anandgeforce said:

Man, a 650W PSU will be perfect, if not more than enough. If you plan on getting more graphics cards, then 750W is fine, but for you current setup, I repeat, 650W is more than enough. Trust me...

Basically this. 650W is a good wattage for pretty much any CPU/single GPU system fully overclocked, possibly with some exceptions. If in doubt and you're running a single graphics card, 650W.

[Gdourado]

According to the psu tier list here on the forum, my XFX black edition is a tier 1 psu while the Silverstone 750w model is a tier 4 unit... 

Só based on this, should I totally forget the downgrade? 

 

Cheers