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Estimate on how much power I am using?

jnmbhj

I got a second 7970 ghz a week ago and I am kinda wondering how much power I am actually going to be using and pulling from the wall. I am going to upgrade to a z97 msi gaming 5 motherboard and a 4790k in a week as well. I just have to wonder how much power I am going to be pulling from the power supply and how much power I am going to pull from the wall. My PSU is 80+ bronze and the rest of the specs are there 

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Probably around 600-700W. You'll be more than fine with that PSU.

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I got a second 7970 ghz a week ago and I am kinda wondering how much power I am actually going to be using and pulling from the wall. I am going to upgrade to a z97 msi gaming 5 motherboard and a 4790k in a week as well. I just have to wonder how much power I am going to be pulling from the power supply and how much power I am going to pull from the wall. My PSU is 80+ bronze and the rest of the specs are there 

only way to accurately tell is buying a kill o watt meter and see :P. if everything is souped up and OC'ed im guessing ur gonna pull a shitton 

 
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If you can afford that, you can afford a cheap kilowatt meter.

 

 

only way to accurately tell is buying a kill o watt meter and see  :P. if everything is souped up and OC'ed im guessing ur gonna pull a shitton 

 
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Probably around 600-700W. You'll be more than fine with that PSU.

I know my power supply is way overkill. Just curious 

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If you can afford that, you can afford a cheap kilowatt meter.

 

 
 
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I aint a marksman for no reason son 

 
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Get this program called Joulemeter. It's developed by Microsoft themselves, and it's free.

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only way to accurately tell is buying a kill o watt meter and see :P. if everything is souped up and OC'ed im guessing ur gonna pull a shitton 

 

I'd guess more around 450W-500W under a gaming load.  550-600W peak.

Lets see 

4790k 88w non oc probally about                    100w oc to 4.6 ghz

7970 ghz 300 watt TDP x2                               600w

hard drives a random crap(aka dvd burner)    35w

Fans and leds+water cooling                           25w

Soooo about 760 watt Peak 

Multiply that by 75% for a gaming load

Sooo about 570 watt from the power supply multiply by 20% for the power loss from conversion and add to 570

So the grand total of watts from the wall during a gaming load is 684w .

or aka 

115 v at 6 amps

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Lets see 

4790k 88w non oc probally about                    100w oc to 4.6 ghz

7970 ghz 300 watt TDP x2                               600w

hard drives a random crap(aka dvd burner)    35w

Fans and leds+water cooling                           25w

Soooo about 760 watt Peak 

Multiply that by 75% for a gaming load

Sooo about 570 watt from the power supply multiply by 20% for the power loss from conversion and add to 570

So the grand total of watts from the wall during a gaming load is 684w 

how did you get 760W peak to go down to 570, by multiplying it with 75%?.. im bad at math but that just seems like drunk math 

 
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how did you get 760W peak to go down to 570, by multiplying it with 75%?.. im bad at math but that just seems like drunk math 

760 x .75= 570

 

.75 = 75%

 

100%=1

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760 x .75= 570

 

.75 = 75%

 

100%=1

im still stuck at how you managed to make 760 times 75% lower than the number you started out with 

 
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im still stuck at how you managed to make 760 times 75% lower than the number you started out with 

I calculated for the peak then I multiplyed it by 75% to get a gaming power draw. Because in games it would not use as much power as prime 95+ furmark. 

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I got a second 7970 ghz a week ago and I am kinda wondering how much power I am actually going to be using and pulling from the wall. I am going to upgrade to a z97 msi gaming 5 motherboard and a 4790k in a week as well. I just have to wonder how much power I am going to be pulling from the power supply and how much power I am going to pull from the wall. My PSU is 80+ bronze and the rest of the specs are there 

4790k with 2 7970's? You will pull about 740w balls to the wall maxed. Which you won't be able to max the cpu and gpu's at the same time.

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I calculated for the peak then I multiplyed it by 75% to get a gaming power draw. Because in games it would not use as much power as prime 95+ furmark. 

im still baffled by how you manage to MULTIPLY a number with any number and get LESS than the number you started out with LOL

 
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4790k with 2 7970's? You will pull about 740w balls to the wall maxed. Which you won't be able to max the cpu and gpu's at the same time.

When I calculated peak it was pretty much 4790k Oc on prime 95 with the 7970s in furmark maxed out. For the max power draw then I multiply that number by 75% to get a gaming power draw or a kinda realistic real world power draw

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im still baffled by how you manage to MULTIPLY a number with any number and get LESS than the number you started out with LOL

lol 

4*1=4

4*.5=2 

magic 

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Lets see 

4790k 88w non oc probally about                    100w oc to 4.6 ghz

7970 ghz 300 watt TDP x2                               600w

hard drives a random crap(aka dvd burner)    35w

Fans and leds+water cooling                           25w

Soooo about 760 watt Peak 

Multiply that by 75% for a gaming load

Sooo about 570 watt from the power supply multiply by 20% for the power loss from conversion and add to 570

So the grand total of watts from the wall during a gaming load is 684w .

or aka 

115 v at 6 amps

 

A 7970 does not draw 300W...

 

Let's put it this way, I've measured a system before with a Kill-a-watt, using a 125W Phenom II 6-core (overclocked beyond that) and dual overclocked R9 290s in crossfire.  Never saw it pass 630W from the wall.  The power supply (SeaSonic 760W platinum) would be about 90% efficient at that load, so we are looking at about 550-570W system draw. With dual 7970s you'd probably pull 50-100W less. A kill-a-watt isn't necessarily 100% accurate down to the watt but it should give you an idea.

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A 7970 does not draw 300W...

 

Let's put it this way, I've measured a system before with a Kill-a-watt, using a 125W Phenom II 6-core (overclocked beyond that) and dual overclocked R9 290s in crossfire.  Never saw it pass 630W from the wall.  The power supply (SeaSonic 760W platinum) would be about 90% efficient at that load, so we are looking at about 550-570W system draw. With dual 7970s you'd probably pull 50-100W less. A kill-a-watt isn't necessarily 100% accurate down to the watt but it should give you an idea.

I dont think it would draw as much but looking at the TDP of the r9 290 (275w) it is surprisingly lower than the 7970 ghz (300w TDP) it should be pretty matched. So I was kinda close considering your have a 90% efficient PSU and I have a 80% efficient PSU. But I would get a kill a watt to measure my actual power draw.

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I dont think it would draw as much but looking at the TDP of the r9 290 (275w) it is surprisingly lower than the 7970 ghz (300w TDP) it should be pretty matched. So I was kinda close considering your have a 90% efficient PSU and I have a 80% efficient PSU. But I would get a kill a watt to measure my actual power draw.

 

Interesting.  In every test I've seen the 7970 draws considerably less power than the 290.  I wonder what that's about...

 

On another note, if you were doing calculations for an 80% power supply you'd actually get about 712W with your numbers, you need to apply the 20% loss in the other direction ;) The system power draw (570W) would be 80% of what the PSU draws from the wall since you lose 20% to efficiency, so you wouldn't multiply 570W by 1.2 which would add 20% of 570.  20% of 570 is not the same amount as 20% of the original power drawn from the wall, which is what was lost.  You would actually multiply by 1.25, since the original 20% loss would be 1/4 of the remaining 80% (the 570W).  It's not as easy to calculate the difference if you have less even numbers like 86%, so an easier way to do it is to divide 570W by 80%.  Since 570 is 80% of the original power (570 = 0.8 * Original) then 570W divided by 80% would give you the original power from the wall (570 / 0.8 = Original).  And likewise if you measured the power from the wall instead, you would multiply by 80% to get the power draw from the components.

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I have a similar system as you with two HD 7970's (full system spec in profile). My system is connected to a power meter (similar to the Kill-A-Watt meters).

My power draw from the wall, when gaming, typically sits in the higher 600W range. The highest recorded so far is ~785W (synthetic benchmarking).

Consider that my power supply is about 4-years old now, and is 80 PLUS Bronze rated (Corsair TX850 V1).

 

Neglecting PSU wear / aging, and just consider the 85% efficiency, 785W from the wall equates to approximately 667W from the PSU end.

 

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