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2500k and 7950 on 120radiator?

post #1 of 18
Thread Starter 
I have a 100mV undervolted 2500k and a undervolted 7950 with good Asic (starting voltage according MSI AB is 993mV).
Now could I run these things from a 120mm 45mm thick radiator?

Not sure yet how much the 7950 can undervolt, my guess is 900-950mV vcore @ 810core/1250memory.

I guess a MAX core tempererature of 60c should be OK?
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post #2 of 18
Why do it? Even if possible, it would not produce any good temps, and air would most likely be better. At least that is what I predict smile.gif
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post #3 of 18
It is not wise. Rule of thumb for the 120 skinnys, is a minimum of 120.1 for the CPU, 120.2 per GPU.

You can make it work, but defeats the purpose of watercooling, keep temperatures nice and cool as close to ambient for long periods of time. Once you get that heat going, you have a veritable radiator that will only slowly cooldown and obviously raise temperatures of the surrounding areas.

You might get better temperatures on AIR in all honesty.
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post #4 of 18
Thread Starter 
Quote:
Originally Posted by Idef1x View Post

Why do it? Even if possible, it would not produce any good temps, and air would most likely be better. At least that is what I predict smile.gif

well I only have the 120mm radiator available(other stuff I have complete loop CPUblock/GPUblock/pump/tubing/fitting etc), maybe I'll use aircooling on CPU, but if it can be done CPU+GPU on the 120rad I would rather do that smile.gif
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post #5 of 18
If you try to run a 120mm radiator on a game that stresses your GPU+CPU its not going to maintain any temperatures, it is simply going to rise over time.

Try to think of it this way, your 7950's air cooled heatsink is almost bigger than 120mm radiator, how would adding a CPU to it help cool it tongue.gif
  
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post #6 of 18
Its perfectly doable, if you don't mind either high fan speeds or not the greatest temperatures. Its certainly easy to do better than air cooling anyway.

Not sure what core you want at 60 degrees though; CPU maybe, but that temp is low for a CPU, GPU it should be no problem. Depending on your ambient it should be OK even without the undervolting.
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post #7 of 18
Quote:
Originally Posted by Jakusonfire View Post

Its perfectly doable, if you don't mind either high fan speeds or not the greatest temperatures. Its certainly easy to do better than air cooling anyway.

Not sure what core you want at 60 degrees though; CPU maybe, but that temp is low for a CPU, GPU it should be no problem. Depending on your ambient it should be OK even without the undervolting.
High speed fans or jet engine turbines ? biggrin.gif
If he loads a game like Battlefield 4, his cpu/gpu temps will only keep rising and his water temp will do the same. There will be no point at which his water temp stabilizes.
Can't this simply be calculated by CPU wattage output + GPU wattage output - RAD wattage dissipation ?
  
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post #8 of 18
Why would the temp not stabilise? The water just warms up til the wattage out from the rad equals the wattage being produced. If the water is 20C above ambient the rad is dumping twice the wattage it does at 10C
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post #9 of 18
Quote:
Originally Posted by Jakusonfire View Post

Why would the temp not stabilise? The water just warms up til the wattage out from the rad equals the wattage being produced. If the water is 20C above ambient the rad is dumping twice the wattage it does at 10C

I don't know what to say. That general rule of thumb telling people 120mm for a block is okay. Definitely isn't the bare minimum. Telling someone interested who wants to watercool that he can put 120mm for cpu+gpu is going to be a bit misleading.
We want him to have better temps than air on water right? tongue.gif
note: don't read this as argumentative or confrontational, trying to understand this for myself.
Edited by INCREDIBLEHULK - 1/14/14 at 8:04pm
  
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post #10 of 18
General rules of thumb are mostly nonsense. How does a 77 watt CPU and 150-175 watt GPU compare to say a 2011 socket 130 watt CPU + 250-300 watt GPU? Not very samey at all.

Just do the math. 77 watt CPU, say 175 watt GPU at worst; even though he has said he is undervolting.
http://www.techpowerup.com/reviews/MSI/HD_7950_Twin_Frozr_III/24.html
So about 250? or the same as, or actually less than, a 780ti or 290X. With a single 1850RPM fan say about 90w for each 10C above ambient, or about 27-28C above ambient. All that assumes the very worst, which does not happen. The real water temp will be quite a bit lower.

If the water is +28C the GPU will be about +38C, in a 20C room that means about 58C

Sure its not ideal, but that is not what he asked.
Edited by Jakusonfire - 1/14/14 at 9:09pm
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