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I dont own a kill a watt but i have a theory. - Page 3

post #21 of 25
Quote:
Originally Posted by LuckySe7ens View Post

Its not a PSU issue. There is absolutely no way that your pulling more than 750 watts from the wall with your gpus IDLING in P95, let alone ~ 900watts
Ridiculous tongue.gif

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=262


SYSTEM consumption @ cpu load. http://www.anandtech.com/show/6396/the-vishera-review-amd-fx8350-fx8320-fx6300-and-fx4300-tested/6


~20 watts more than an i7 with the fx 6300... were not talking 700 watts here.

The 8 core @ 4.8ghz running @ 300watts @ the wall for the whole system

This would be a very easy way to determine for certain what we already know
Your factoring that in the wrong direction. 80% efficiency means that to deliver 750 watts to your rig the psu must pull ~ 900w from the wall which it can do fine
Your over estimating, and assuming 100% load on GPUs plus CPU. Maybe if your running IBT and MSI Kombuster @ the same time then you might be getting close.

i had a BFG 550W that would shutdown with my 955 @ 4.1ghz, temperatures were all in line. You're over estimating OPs psu.
i don't know about '900 watts' but op did state he had a 100$ ocz psu. if it were me i'd replace it first to see if that was the problem.
OP also has 2 (read: two) 7970s. he also used a power supply calculator which are pretty good at estimating total system requirements.

so by the anandtech bench you posted above, albeit a 6300 instead of a 8350,
and toms putting the 7970 pushing 300w underload

i'd say yes, 750w is bare minimum for OPs system. two highly overclocked cards and overclocked cpu, that requires some clean power.
http://www.bit-tech.net/hardware/2012/11/06/amd-fx-8350-review/7
Edited by l0max - 3/15/13 at 11:52am
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post #22 of 25
put a volt meter on your 12V, 5v, and 3.3v lines and see where your at when stress testing.
that will give you a good indication weather or not your overloading your PSU.
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post #23 of 25
Quote:
Originally Posted by l0max View Post

Warning: Spoiler! (Click to show)
Quote:
Originally Posted by LuckySe7ens View Post

Its not a PSU issue. There is absolutely no way that your pulling more than 750 watts from the wall with your gpus IDLING in P95, let alone ~ 900watts
Ridiculous tongue.gif

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=262


SYSTEM consumption @ cpu load. http://www.anandtech.com/show/6396/the-vishera-review-amd-fx8350-fx8320-fx6300-and-fx4300-tested/6


~20 watts more than an i7 with the fx 6300... were not talking 700 watts here.

The 8 core @ 4.8ghz running @ 300watts @ the wall for the whole system

This would be a very easy way to determine for certain what we already know
Your factoring that in the wrong direction. 80% efficiency means that to deliver 750 watts to your rig the psu must pull ~ 900w from the wall which it can do fine
Your over estimating, and assuming 100% load on GPUs plus CPU. Maybe if your running IBT and MSI Kombuster @ the same time then you might be getting close.

i had a BFG 550W that would shutdown with my 955 @ 4.1ghz, temperatures were all in line. You're over estimating OPs psu.
i don't know about '900 watts' but op did state he had a 100$ ocz psu. if it were me i'd replace it first to see if that was the problem.
OP also has 2 (read: two) 7970s. he also used a power supply calculator which are pretty good at estimating total system requirements.

so by the anandtech bench you posted above, albeit a 6300 instead of a 8350,
and toms putting the 7970 pushing 300w underload

i'd say yes, 750w is bare minimum for OPs system. two highly overclocked cards and overclocked cpu, that requires some clean power.
http://www.bit-tech.net/hardware/2012/11/06/amd-fx-8350-review/7

His PSU is actually pretty good.
Besides, the gpus should only be using a few dozen watts if all he is doing is running prime 95.

To clear something up, when a psu is 80% efficient, it doesn't mean that it can only output 80% of its rated capacity, it means 80% of the power it pulls from the outlet of your home is actually being used to power the PC.
If you ask 750w from a 750w PSU and it is 80% efficient, it will pull ~938w from the wall. Most review sites measure the power being taken from the wall, so when they put up a chart saying the system is using 300w at full gpu load, the system is probably only asking about 240w from the psu.


Another thing I want to mention is sometimes increasing voltages can reduce stability, so don't assume the solution to instability is always more voltage.
Edited by qwertymac93 - 3/15/13 at 1:11pm
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post #24 of 25
Thread Starter 
Ok guys holy crap soo much info here lately.

My nb voltage is stock ht stock.

I really dont know too much about overclocking other than what ive accomplished just but upping cpu voltage and increasing the multiplier to 23.5

Any guide out their to read so I can memorize these terms. Llc etc

Sent from my SCH-R950 using Tapatalk 2
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post #25 of 25
Quote:
Originally Posted by l0max View Post

i had a BFG 550W that would shutdown with my 955 @ 4.1ghz, temperatures were all in line. You're over estimating OPs psu.
i don't know about '900 watts' but op did state he had a 100$ ocz psu. if it were me i'd replace it first to see if that was the problem.
OP also has 2 (read: two) 7970s. he also used a power supply calculator which are pretty good at estimating total system requirements.

so by the anandtech bench you posted above, albeit a 6300 instead of a 8350,
and toms putting the 7970 pushing 300w underload

i'd say yes, 750w is bare minimum for OPs system. two highly overclocked cards and overclocked cpu, that requires some clean power.
http://www.bit-tech.net/hardware/2012/11/06/amd-fx-8350-review/7

In my post that you quoted Im showing a johnnyguru review on his exact PSU. Also, he has 7950's, not 7970's, and finally regarding the power from the wall and the 80% efficiency thing, I already explained this, but the post below mentions it as well.

Quote:
Originally Posted by qwertymac93 View Post

His PSU is actually pretty good.
Besides, the gpus should only be using a few dozen watts if all he is doing is running prime 95.

To clear something up, when a psu is 80% efficient, it doesn't mean that it can only output 80% of its rated capacity, it means 80% of the power it pulls from the outlet of your home is actually being used to power the PC.
If you ask 750w from a 750w PSU and it is 80% efficient, it will pull ~938w from the wall. Most review sites measure the power being taken from the wall, so when they put up a chart saying the system is using 300w at full gpu load, the system is probably only asking about 240w from the psu.


Another thing I want to mention is sometimes increasing voltages can reduce stability, so don't assume the solution to instability is always more voltage.

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