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[Official] EVGA Classified & K|NGP|N Owner's Club - Page 1000

post #9991 of 21377
Superb post one of the best ive read in very long time + rep for you sir
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post #9992 of 21377
Woot i got post 1000 smile.gif
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post #9993 of 21377
i mean page 1000
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post #9994 of 21377
Not at my 40 posts/page setting, you did not! biggrin.gif

But a +1 for you to hit page 200 here.
post #9995 of 21377
Quote:
Originally Posted by Deaf Jam View Post

Ok, let's see if I can help you then.

We will assume some simplified rules of thermodynamics and heat transfer to make the explanation easier and remove some math.

Let us assume that your GPU can handle 100 pts of energy. Anything under, the card runs, anything over, you get a crash. Also, temperature is energy and voltage is energy.

High temps are higher energy than low temps. Low voltage is lower energy than high voltage. These charts are not accurate, but rough estimates to illustrate what is happening.

So, let's make a chart of voltage energy and heat energy.

Voltage........... Energy..........Increase in energy from previous step
Stock ............ 5 pts
1.2 ................10 pts ........................5 pts
1.25 .............. 17 pts .......................... 7 pts
1.3.................. 27 pts ........................ 10 pts
1.35 ................40 pts ...........................13 pts.

As you can see, amount of energy increases more as you go higher. Now for temperature.

We will assume each degree C is 1 pt. of energy. That gives us this table

50C = 50 pts
60C = 60 pts
70C = 70 pts
80C = 80 pts
90C = 90 pts

So, we now have two tables describing our energy for both temperature and voltage. We also know that the card cannot handle over 100 pts of energy.

Let's combine the tables to see what we get

1.15v @ 90C = 5+90 pts = 95 pts. The card is fine with this as it is under it's 100 pt. limit
1.2V @ 90C = 10+90 pts = 100 pts. The card is at it's limits, but can still run as long as it doesn't go over 90 C
1.25V @ 80C = 17+80 pts = 97 pts. The card is fine here as it is under 100 pts.
1.25V @ 90C = 17+90 pts = 107 pts. The card crashes as it is over it's 100 pt limit

So now that we have started filling in the table, let us see what happens at higher voltage like you are desiring to run.

1.3 V takes up 27 pts of energy. 100-27 = 73 pts left for temperature. Since 1 pt = 1 degree C, we have 73C as the limit before the card has had too much. So now, by our example we know that anything over 73C will crash our cards at 1.3 volts.

At 1.35 V, 40 pts are taken up by voltage, that means we have only 60 left for temperature. So anything over 60 C will be too much for our card. That is why your card was crashing at 80C, you were over your cards limit.

This is why cooling is important. Temperature is a measure of energy as is voltage.

Now, why does water cool better than air? The answer has to do with how much energy one unit of air can hold compared to one equally sized unit of water. This is measured by how much energy it takes to raise a unit 1 degree C.

Air has a heat capacitance of 1 kJ/kg C
Water has a heat capacitance of 4 kJ/kg C

So now we see that water, with all things being equal, is 4 times better than air at removing heat. I hope this clears some things up for you. I

I'm glad you didn't take my post the wrong way. If you have anymore questions, let me know.

nice! thanks dude .. so you are basically saying if i want to run my card @ 1.35v stable i have to stay under 60°C ? not a prob with hydro copper ^^
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post #9996 of 21377
Ok so it seems like I am finally buying my watercooling setup this week or the week after.

Setup so far because I need some help.


GPU: http://www.ekwb.com/shop/ek-fc780-gtx-classy-nickel.html

CPU: http://www.ekwb.com/shop/ek-supremacy-full-nickel.html Is there really any reason to buy the supremacy elite 2011? Since all I can notice is the 20+ euros TIM as difference?

Reservoir: http://www.ekwb.com/shop/ek-bay-spin-reservoir-white-acetal-csq.html I wanted a different colored one but they are all sold out.

Pump: http://www.ekwb.com/shop/ek-dcp-4-0-12v-dc-pump.html

Radiator: http://www.ekwb.com/shop/ek-coolstream-rad-xtx-360.html

These are the main parts.


Rig it has to go into:

Case: coolermaster HAF 932 advanced
Mobo: asus rampage IV formula
CPU: intel I7 3960X
GPU: 780 Ti classified
RAM: 24 gigs of corsair vengeance 1600mhz(one stick died)
PSU: corsair AX1200


I don't see the point of the supremacy elite. is indigo extreme really needed or is it abit overkill for my setup?

I have NO idea if my pump is any good as I have no fricking clue about these things.

Do I really need a double reservoir or is a single reservoir fine?

Does anybody know if that XTX will fit with push and pull?(932 HAF advanced)

Anything you guys would add or change?

Now I need help on the smaller bits.

I have no idea what fittings/tubing and such to use so it would be handy if you guys could help with that.

in terms of fans I have no real idea because I have seen a bajillion fans. I don't really care about noise levels I care more for performance.

I know I posted something like this before but the moment is finally here but im not finished yet and it would be awesome if you guys could use your expertness to help me out.
post #9997 of 21377
Quote:
Originally Posted by strong island 1 View Post

when overvolting 80c is very high. I don't have any specific data to back it up, but when I would reach about 60-70c when above about 1.3v I would see a lot of artifacts and the additional voltage didn't even seem to help. Once I finally put my 780 under water it made such a huge difference. I have been trying to tell people since the 780 release that you really can't judge the performance of these classified cards on air. My card was like night and day going to water. A lot of other cards i had like locked 680's and titans didn't really change much going to water but the additional voltage we have to play with really makes use of the colder temps water can provide. it's an amazing difference.

So even though you think your temps are good and you should be able to push farther it's not the case. You need to try and bring them below 60c under full load to start to push your card further in my opinion.

Also did you try using the pwm control for additional stability. it should help increase voltage under load.
hi strong island i didnt yet played whit PWM but i will try this night.what is PWM will help in overclocking?
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post #9998 of 21377
Thread Starter 
Quote:
Originally Posted by gagac1971 View Post

hi strong island i didnt yet played whit PWM but i will try this night.what is PWM will help in overclocking?


it should help stabilize higher overclocks. it increases the voltage underload.
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post #9999 of 21377
Quote:
Originally Posted by Maxincredible52 View Post

nice! thanks dude .. so you are basically saying if i want to run my card @ 1.35v stable i have to stay under 60°C ? not a prob with hydro copper ^^
thak you so much Maxincredible52 what a explanation yes sir ....great!i will dont push car anymore until i will put him on water and also i can get up to 1306 mhz rock solid whit stock voltage and temp never pass 60c fans on max speed,from there i will stick on that clock until water block will came.
water cooling that i will set up is not perfect but for now will serve i get swiftech h 220 and also get one more radiator,from there whit two radiators and swiftech h 220 pump i hope that will serve for now to cool my i7 4770k on 4.5 ghz and also my classy....
Dragan
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Dragan
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post #10000 of 21377
Thread Starter 
I just had to do it. Post 10,000. Wow that's really amazing.
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Hard DriveHard DriveCoolingCooling
Corsair Neutron 120gb Corsair Neutron 120gb Kingpin Tek 9 Fat GPU Pot Kingpin F1 Extreme CPU Pot 
CoolingCoolingOSOS
EK Universal GPU Water Block EK Supremacy CPU Block Win 7 64 bit Win XP 32 bit 
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Bench Rig
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Intel i7 core 5960x intel i7 core 4770k Rampage V Extreme Asus GTX 980 Strix 
GraphicsRAMRAMHard Drive
Asus 780 ti Matrix G-Skill Ripjawz 4 G-Skill Trident X Samsung 840 Evo 120gb 
Hard DriveHard DriveCoolingCooling
Corsair Neutron 120gb Corsair Neutron 120gb Kingpin Tek 9 Fat GPU Pot Kingpin F1 Extreme CPU Pot 
CoolingCoolingOSOS
EK Universal GPU Water Block EK Supremacy CPU Block Win 7 64 bit Win XP 32 bit 
MonitorPowerCaseOther
Samsung S27A950D Corsair AX1200 Dimastech Easy v3 Bench and Armaflex Gigabyte Z97 SOC Force Motherboard 
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