• Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
    Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.

GPU before CPU in cooling loop??

D

Dunno

Limp Gawd
Joined
Sep 14, 2003
Messages
151
OCing is all about faster/better graphics performance, unless you'r a Seti or Folding etc. person.

In my experience OCing the graphics card makes a much bigger difference than OCing the CPU?

So should'nt the bit that makes the bigger difference get the coolest coolant???
The GPU also adds much (??) less heat than the CPU, so the CPU should be affected less this way.
:)
 
At first I had my water cooling going to the gpu then the cpu and i saw no difference in temps switching it from cpu to gpu on my cpu temps.My set up was like this
res(pump in res)-gpu-cpu
now it's:res-cpu-gpu I think the biggest temp diff i saw was 1 c hotter....
So just try it.You have nothing to loose except time.
 
I should go find the link to the thread where I calculated how much your CPU and GPU are raising the temperature of the water.... hang on while I look, basically it wont matter what order you put it in.
 
Haha, victory is mine!!! Original Thread
Lets say that your processor outputs 100W (100J/s) and the typical pump will output about 10W (10J/s) into the loop. The average loop will be running at say 3 lpm, or converted for ease of calculations to come 0.05 lps. One litre of water is ~1kg. The specific heat of water is approximately 4.186J/g*K. Specific Heat is defined as the amount of energy required to raise the temperature of 1 gram of a substance by 1 degree kelvin. Now for some calculations....

The formula for calculating temperature rises used will be as follows : Q = mcΔT
m = mass, c = specific heat capacity, ΔT = Change in temperature.
Note : Because the change in temperature is the variable we want, in this case simply divide Q by mc to get the desired result.

  • Temperature increase between inlet and outlet as a result of the pump :

In one second the pump is inputting heat (Q) of Q = (10J/s)(1s) = 10J
In one second you have 0.05 litres flow through the pump so mass (m) = (0.05l/s)(1s)(1000g/l) = 50g

Now with this information we can perform our calculation :
ΔT = 10J / [(50g) * (4.186J/g*K)]
ΔT = 0.0477 K = 0.0477 C

So now we just found that the temperature increase the water experiences from the pump is about one half of one tenth of a degree centigrade...hardly enough to cry over.​

  • Temperature increase between inlet and outlet as a result of the cpu :

I am not going to bore you with these calculations. I will simply explain that because the values I assumed for CPU power output were 100W, or 10x larger than that of the pump I assumed, the resulting temperature difference will also be one order of magnitude larger.

ΔT = 0.477 K = 0.477 C

The temperature difference coming out of the cpu is less than half of a degree centigrade.​

NOTE : The flow rates that I took are for a low flow system, using 3/8" ID hosing. High flow 1/2" systems produce almost twice as much flow, meaning twice as much water traveling through in one second, meaning half as much increase in water temperature.​
Click to expand...
 
Hmm....

So then for a koolance system @ 2 l/min I get a 0.7 C increase with my CPU.
How much heat does a 9800xt core produce? R360
Searching keeps giving me power supplies :mad: :D

Hardly seems worth worring about.
Interesting though!
:)
 
How long will it take people to realize this?
THE ORDER OF COMPONENTS WILL MAKE MUCH LESS OF A DIFFERENCE THAN ROUTING YOUR TUBING TO USE THE SHORTEST AMOUNT OF TUBING WITH THE FEWEST TIGHT TURNS!

Since you're using a Koolance system mounted at the top of your case, the order doesn't matter for keeping tubing length short, but trying to keep tight turns to a minimum will make a noticeable difference. If you really feel like you 9800xt needs 0.7*C cooler water, then go right ahead.
 
ikellensbro said:
How long will it take people to realize this?
THE ORDER OF COMPONENTS WILL MAKE MUCH LESS OF A DIFFERENCE THAN ROUTING YOUR TUBING TO USE THE SHORTEST AMOUNT OF TUBING WITH THE FEWEST TIGHT TURNS!

Since you're using a Koolance system mounted at the top of your case, the order doesn't matter for keeping tubing length short, but trying to keep tight turns to a minimum will make a noticeable difference. If you really feel like you 9800xt needs 0.7*C cooler water, then go right ahead.
Click to expand...


calm down dude :) we have already established that fact no need to get your feathers all ruffled.
 
You must log in or register to reply here.
Back
Top