GUYS AM I GOING TO BURN MY HOUSE DOWN - PLEASE HELP !

CryptoWatcher420

sr. member

Activity: 462

Merit: 258

Small Time Miner, Rig Builder, Crypto Trader

Quote from: ChrisOrr30 on January 21, 2018, 06:21:17 PM

Quote from: NameTaken on January 21, 2018, 02:46:27 PM

Kill A Watt measures AC power while PSUs are rated for DC power output. If your PSU is delivering the full 850W, it would be drawing ~950W from the wall depending on efficiency.

A more accurate answer is that the Kill-A-Watt measures total input power for the system including PSU losses. The PSU spec (850W in this case) may be total DC power output, IE, before losses attributed to the PSU.

If you're reading 855W from the wall on a 80% efficient power supply, the total power delivered to the load would be approximately 684W. If it was a 90% efficient power supply and still drawing 855W then the total load power would be 769W.

A Watt is a Watt, AC or DC is irreverent until you start getting into power factor considerations and VARS

ac or dc is a relevant factor considering they are 2 different types of systems, a watt of dc is not going to be the same as a watt in ac

philipma1957

legendary

Activity: 4158

Merit: 8049

'The right to privacy matters'

Quote from: blockchange88 on January 21, 2018, 02:37:42 PM

im running a few proof of concepts. i was experimenting with one my motherboards today, and found myself in a conundrum.

Using 3 x asus 1080ti turbo
psu evga 850w p2 at a 120v wall socket (not 220-240)

my smos setting are set at factory settings but undervolted to 180w each card.

if the mobo/cpu takes 150w (a thirsty estimate) and each card is pulling 200w appx, i should be able to end up at 750w which is more than enough power for this experiment. however my killawatt is showing me pulling 855w on my 850w psu. i will post pictures.

https://imgur.com/st4Sexd

https://imgur.com/FC4t0zg

https://imgur.com/MfNuJgp

https://imgur.com/1KAs1Sm

any help/advice is appreciated! thanks

Program the three card to run ebwf 3.4

Look at the kwatt meter see if it drops to 800.

If it does compare hashrates and decide if dstm is worth the extra 50 watts.

I have four meters they can be 5 % off.

In your case .9 x 853 = 760. Which is pushing the unit

ChrisOrr30

newbie

Activity: 4

Merit: 0

Sorry, just sounded like you were trying to say that the difference was caused between the kill-a-watt measuring AC power which is different from DC power. Some of the cheaper power supplies use the input power rating as opposed to output power rating as it makes them sound better. As for the PS in the OP's post, I've never really looked at it so I can't comment on which it uses, although I imagine the 850W rating would be output power.

NameTaken

hero member

Activity: 630

Merit: 502

Quote from: ChrisOrr30 on January 21, 2018, 06:21:17 PM

Quote from: NameTaken on January 21, 2018, 02:46:27 PM

Kill A Watt measures AC power while PSUs are rated for DC power output. If your PSU is delivering the full 850W, it would be drawing ~950W from the wall depending on efficiency.

A more accurate answer is that the Kill-A-Watt measures total input power for the system including PSU losses. The PSU spec (850W in this case) may be total DC power output, IE, before losses attributed to the PSU.

If you're reading 855W from the wall on a 80% efficient power supply, the total power delivered to the load would be approximately 684W. If it was a 90% efficient power supply and still drawing 855W then the total load power would be 769W.

A Watt is a Watt, AC or DC is irreverent until you start getting into power factor considerations and VARS

Is that not what I said? A PSU converts alternating current from the wall to direct current that your hardware can use. The wattage they advertise is the maximum amount of direct current watts they are designed provide. The 80 Plus certification system ranks how efficient they are at converting AC to DC.

ChrisOrr30

newbie

Activity: 4

Merit: 0

Quote from: NameTaken on January 21, 2018, 02:46:27 PM

Kill A Watt measures AC power while PSUs are rated for DC power output. If your PSU is delivering the full 850W, it would be drawing ~950W from the wall depending on efficiency.

A more accurate answer is that the Kill-A-Watt measures total input power for the system including PSU losses. The PSU spec (850W in this case) may be total DC power output, IE, before losses attributed to the PSU.

If you're reading 855W from the wall on a 80% efficient power supply, the total power delivered to the load would be approximately 684W. If it was a 90% efficient power supply and still drawing 855W then the total load power would be 769W.

A Watt is a Watt, AC or DC is irreverent until you start getting into power factor considerations and VARS

blockchange88

jr. member

Activity: 141

Merit: 4

ethereum is a fork of ethereum classic.

wow thank you guys! this was my first post on this forum, and truly appreciate the quick responses. will experiment some more, and post follow up shortly!

xxcsu

hero member

Activity: 1498

Merit: 597

WHO TOLD YOU YOUR 1080 TI DRAWING 200 WATTS DURING MINING ? WHERE DID YOU GET THAT NUMBERS FROM
yes you can reducing the power draw with proper overclocking/undervolting

Your CPU/Mobo/Mem might pulling around 50-60 watts , so one of your 1080 ti probably pulling around 855-55=800 , 800:3=266 watts

Stingi

newbie

Activity: 9

Merit: 0

These number seem a bit high. You should definitely lower the TDP of your cards if you're hitting 855 watts.
With 80% power draw on your cards you should be fine. Remember to account for the riser in your wattage calculations.

NameTaken

hero member

Activity: 630

Merit: 502

Kill A Watt measures AC power while PSUs are rated for DC power output. If your PSU is delivering the full 850W, it would be drawing ~950W from the wall depending on efficiency.

kenzie95

full member

Activity: 143

Merit: 120

850w is definitely not enough for that, get more watts

blockchange88

jr. member

Activity: 141

Merit: 4

ethereum is a fork of ethereum classic.

im running a few proof of concepts. i was experimenting with one my motherboards today, and found myself in a conundrum.

Using 3 x asus 1080ti turbo
psu evga 850w p2 at a 120v wall socket (not 220-240)

my smos setting are set at factory settings but undervolted to 180w each card.

if the mobo/cpu takes 150w (a thirsty estimate) and each card is pulling 200w appx, i should be able to end up at 750w which is more than enough power for this experiment. however my killawatt is showing me pulling 855w on my 850w psu. i will post pictures.

https://imgur.com/st4Sexd

https://imgur.com/FC4t0zg

https://imgur.com/MfNuJgp

https://imgur.com/1KAs1Sm

any help/advice is appreciated! thanks

Topic: GUYS AM I GOING TO BURN MY HOUSE DOWN - PLEASE HELP ! (Read 286 times)