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[Official] EVGA 780 Ti Classified K|NGP|N Owner's Club - Page 796

post #7951 of 8146
Quote:
Originally Posted by TobbbeSWE View Post



Hey guys!

Is it really possible that my PSU bottleneks my current rig when overclocking this hard.

My two ref EVGA 780Ti's is hardmodded.
CPU is at 4930K 4.8GHz 1.55v

Currently using 1.45v on bothcards in SLI benching 3dmark. I have passed several 1537mhz -8000mem with one card now i wanna push some SLI scores also.
But my rig is hardcrashing when passing 1430mhz in SLI. I have been monitoring my powerdraw with corsair link. Looks like the PSU shut down when hitting 1260w in - 1160w out.

Everything is watercooled and my temps i very good.

Is it possible to draw this much with two cards! tongue.gif




with 1.45 volt my single Kingpin pulls around 500 watts!! assuming that a single card of yours will probably be in the same area it might be close to the maximum power output of your psu. but that corsair will most likely not ocp until loaded with 15% overcurrent. are there any other big consumers apart from the cpu and the cards?
post #7952 of 8146
Quote:
Originally Posted by TobbbeSWE View Post

I'm only only passing 1.2v when overklocking. I have no use for more when gaming. smile.gif

The pcb is monitored by a temp probe at the Vrm's. And i have made sure to get the most out of the water cooling.
Heat-pads at the right spots can make a huge difference in temperature. Especially when making contact with the water block and backplate. thumb.gif

I've soldered on cables so i can use different resistors giving me extra volt to the core. And also voltage read out points directly at the vrm's.
33R "OHM" gives ruffly 1.45v when applying 1.212v in precision X







thats awesome!!! given all the work you put into it, i would run much higher volts for 24/7! very nice dude!
post #7953 of 8146
lol no... i mean for instance. 1.45v is nearly too high for 5ghz and 85c is pretty much past the limit of those chips
and I know for a fact 1.55 is too high. I have phased one of those chips to 5.4ghz with 1.55v what you are doing is just ridiculous.

1.45 is pretty much the limit on those chips with custom water.
Edited by tatmMRKIV - 3/28/15 at 1:11pm
post #7954 of 8146
Quote:
Originally Posted by tatmMRKIV View Post

lol no... i mean for instance. 1.45v is nearly too high for 5ghz and 85c is pretty much past the limit of those chips
and I know for a fact 1.55 is too high. I have phased one of those chips to 5.4ghz with 1.55v what you are doing is just ridiculous.

1.45 is pretty much the limit on those chips with custom water.

why? its all about performance! hardware falls in value so fast that it doesnt make any sense not to get the most out of it!

for me its about carefully testing out the limits without destroying it instantly, but if the cpu has degraded after a year or so, who cares?
Edited by valkyrie1960s - 3/28/15 at 1:16pm
post #7955 of 8146
Quote:
Originally Posted by valkyrie1960s View Post

with 1.45 volt my single Kingpin pulls around 500 watts!! assuming that a single card of yours will probably be in the same area it might be close to the maximum power output of your psu. but that corsair will most likely not ocp until loaded with 15% overcurrent. are there any other big consumers apart from the cpu and the cards?

OK then given the math that my cpu draw roughy 200W each of my cards more than 450W+ it's possible that my powerdraw hits my power-supply upper limit.
Everything runs great right until the draw from the wall hits 1260w the PSU shut down everything.

16GB Dominator 2133mhz 1.65v
4930K
Two 780Ti's
Seven 140mm Bequietfans at 1000rpm.
Two Samsung SSD's
One D5 Pump at max speed.
    
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post #7956 of 8146
Quote:
Originally Posted by valkyrie1960s View Post

why? its all about performance! hardware falls in value so fast that it doesnt make any sense not to get the most out of it!

for me its about carefully testing out the limits without destroying it instantly, but if the cpu has degraded after a year or so, who cares?

Ive been running this rig 1.5v 24/7 1,5 year. No sign of degeneration yet. smile.gif
    
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post #7957 of 8146
jeez, these chips are pretty impressive then because that is a stupid amount of volts for that speed

you are probably hitting your voltage limit thoug
Edited by tatmMRKIV - 3/28/15 at 1:26pm
post #7958 of 8146
Quote:
Originally Posted by tatmMRKIV View Post

lol no... i mean for instance. 1.45v is nearly too high for 5ghz and 85c is pretty much past the limit of those chips
and I know for a fact 1.55 is too high. I have phased one of those chips to 5.4ghz with 1.55v what you are doing is just ridiculous.

1.45 is pretty much the limit on those chips with custom water.

Getting a 4930k to 5.4Ghz with 1.55v stable enough to benchmark you need a golden sample of 1 in 150 cpus tongue.gif
I dont believe you until you post some results of that.


CITAT RAJA FROM ASUS
1) In my binning of 45 samples, 2% of CPUs will do 4.8GHz at 1.40V. 20% will do 4.7GHz. Almost 48% will do 4.6GHz at 1.40V. 28% will do 4.5GHz at 1.40V. 2% will do only 4.4GHz at 1.40V. The average frequency is therefore 4.6GHz on a reasonable CPU sample. Not a massive sample size, but I think it gives us a realistic indication of what to expect from retail processors.

https://rog.asus.com/forum/showthread.php?38018-Ivy-Bridge-E-Easy-Overclocking-Guide-%96-The-Listy-Wordy-Edition
    
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post #7959 of 8146
Quote:
Originally Posted by TobbbeSWE View Post

Ive been running this rig 1.5v 24/7 1,5 year. No sign of degeneration yet. smile.gif

there you go! awesome! keep pushing it to the limit:thumb:

with PSUs its strange sometimes, i had an enermax revolution 1250 watt psu and it would not ocp until i loaded it with more than 1500 watts!! each rail is rated at 35 ampere and i pulled more than 50 ampere from it and it was still not a problem!
Edited by valkyrie1960s - 3/28/15 at 1:34pm
post #7960 of 8146
Quote:
Originally Posted by tatmMRKIV View Post

jeez, these chips are pretty impressive then because that is a stupid amount of volts for that speed

you are probably hitting your voltage limit thoug

What voltage limit is you talking about?
    
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