Should GPU = CPU temp in water loop? - Page 4 - Overclock.net

iquark · 2 Weeks Ago

Quote:

Originally Posted by B.Steven

He has an XSPC 360 radiator which are designed for low CFM fans and works very well. Unless you are trying to say he doesn't have enough radiators. It is wrong to say that having a GPU before a CPU in a loop will have NO effect, but it shouldn't increase CPU temps by 5-10 degrees more than having it the other way around.

I don't like the look of that XSPC pump top though. I've heard those things get very hot. Might heat the water. I personally wouldn't use one. It is possible you applied to much TIM. Also possible that the CPU waterblock isn't on tight enough.

But to be honest it is an i7 CPU, and depending on the voltage, those are good temps.

The XSPC top for the DDC is pretty highly rated, and does a lot for the pump according to most. It's an all around good choice from what I've seen.

The effect of GPU before CPU is directly proportional to the increase in water temperature before and after the GPU. If the delta T is 3 degrees, then you'll see about 3 degrees difference in your CPU temp.

I'm not sure how much the GPU heat dump of a 4870x2 is, but it's probably only giving him a few *C difference. If on the other hand it is a 10* dump, then it's a little different.

Nick911 · 2 Weeks Ago

xspc top is very good and so is the radiator. One thing, an I7 should have a triple radiator dedicated to itself for ample cooling or a dual at the least and don't forget you have 4870 X2 ! with only a triple radiator and 3 fans. That is why your temps are horrible! You need another loop or get another triple or double radiator. I have a triple rad with 2 800 rpm fans and one 1000RPM and I can keep temps under 51 while gaming and under 66 under a stresser like Prime95

nub · 2 Weeks Ago

Quote:

Originally Posted by Nick911

xspc top is very good and so is the radiator. One thing, an I7 should have a triple radiator dedicated to itself for ample cooling or a dual at the least and don't forget you have 2 4870's! with only a triple radiator and 3 fans. That is why your temps are horrible.

He also does not have his reservoir directly before his pump in the loop. That is probably affecting his flow and possibly his temps.
I think the OP should consider getting another one of those radiators and another pump, and splitting his loop into 2.

Nick911 · 2 Weeks Ago

Bottom line is this: Get the res before the pump, buy another triple or dual radiator and or split the loop in 2

mrbens · 2 Weeks Ago

Quote:

Originally Posted by nub

He also does not have his reservoir directly before his pump in the loop. That is probably affecting his flow and possibly his temps.
I think the OP should consider getting another one of those radiators and another pump, and splitting his loop into 2.

My res IS before my pump, and the temps on the whole are very low (25C idle water and GPU - only a few C above room temp). I've no interest or need in adding another rad.

I was just interested to know why my CPU is about 15C hotter idle and 10C hotter under load when normally CPUs run colder than GPUs.

Before watercooling, in my old (non water cooled) case with my old AMD X2 4800+ and same ATi 4870x2 that's now being water cooled, my GPU was idling at about 58C with fans set to 27% (so i couldn't hear it over my case fans) and I had to turn the fans up to an unreasonable loud 40-50% speed to keep the temps under 70C when gaming. Now in the new setup it's virtually silent when playing games and the GPU stays around 47-52C while gaming and around 26C idle.

Is it normal for an i7 920 to run hotter than a 4870x2 when they are both in the same loop? I've heard it said a million times that the order of the loop makes virtually no difference to temps so is the i7 just abnormally hot anyway compared to most older CPUs?

Nick911 · 2 Weeks Ago

OH YES, especially if you have HT on

95 watts for a normal q9550 quad but 130 for a I7

trueg50 · 2 Weeks Ago

Quote:

Originally Posted by mrbens

My res IS before my pump, and the temps on the whole are very low (25C idle water and GPU - only a few C above room temp). I've no interest or need in adding another rad.

I was just interested to know why my CPU is about 15C hotter idle and 10C hotter under load when normally CPUs run colder than GPUs.

Before watercooling, in my old (non water cooled) case with my old AMD X2 4800+ and same ATi 4870x2 that's now being water cooled, my GPU was idling at about 58C with fans set to 27% (so i couldn't hear it over my case fans) and I had to turn the fans up to an unreasonable loud 40-50% speed to keep the temps under 70C when gaming. Now in the new setup it's virtually silent when playing games and the GPU stays around 47-52C while gaming and around 26C idle.

Is it normal for an i7 920 to run hotter than a 4870x2 when they are both in the same loop? I've heard it said a million times that the order of the loop makes virtually no difference to temps so is the i7 just abnormally hot anyway compared to most older CPUs?

No, you are a bit off, and quite mislead.

While the GPU tends to run hotter, it doesn't necessarily draw more power, or is harder to cool then a CPU. Usually the CPU will be getting much hotter than the GPU will. My GTX 285 came after the I7 920 in the loop, but it idled at 36C and loaded at 40C or so; while the CPU would run at 38C idle, and load at over 60C.

mrbens · 2 Weeks Ago

OK, so I will not worry about the higher CPU temps any more. Thanks for all your help.

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Should GPU = CPU temp in water loop?

2 Weeks Ago	#38 (permalink)
mrbens New to Overclock.net Join Date: Oct 2009 Posts: 9 Rep: 0 Unique Rep: 0 Trader Rating: 0	OK, so I will not worry about the higher CPU temps any more. Thanks for all your help.

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