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[Official] AMD R9 290X / 290 Owners Club - Page 1853

post #18521 of 43924
Quote:
Originally Posted by Forceman View Post

Warning: Spoiler! (Click to show)
Quote:
Originally Posted by kizwan View Post

Also you'll need this for cooling the VRM1. The stock EK thermal pad unable to cool VRM1 properly when overclocked.
http://www.frozencpu.com/products/17504/thr-185/Fujipoly_Ultra_Extreme_System_Builder_Thermal_Pad_-_Mosfet_Block_-_100_x_15_x_10_-_Thermal_Conductivity_170_WmK.html

The stock pads are adequate to cool the VRMs as long as you don't demand very low temps. My VRM1 only gets to 65C even with 1200/+150mV.
True but it just silly to have VRM1 running @60s Celsius when water cooling. VRMs on my previous AMD GPU running cool in 40s when water cooling with EK water block. If low ambient (indoor) temp, the max temp maybe @60s Celsius but if ambient is higher than 30C, when overclocked & overvolt, VRM1 can go up to 80s Celsius even when water cooling. 80s Celsius is well below & safe according to specification but I prefer running them at lower temp if possible & not to forget kinda silly to have VRMs go over 60C when water cooling.
Quote:
Originally Posted by Red1776 View Post

also keep in mind that while parallel cooling is superior, it does take a lot more flow/pressure to make sure that the waterway is constantly full with no 'dry spots' the more GPU's the more critical this becomes. I used a triple D5 pump setup for my 4 x7970 machine and am using 3-4 on the 4 x R2920x build  am currently building.
I'm sure many people will disagree with that but I leave it to the experts.

I'm late for an appointment. Buh-bye!
Edited by kizwan - 3/6/14 at 9:53pm
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post #18522 of 43924
Quote:
Originally Posted by kizwan View Post

True but it just silly to have VRM1 running @60s Celsius when water cooling. VRMs on my previous AMD GPU running cool in 40s when water cooling with EK water block. If low ambient (indoor) temp, the max temp maybe @60s Celsius but if ambient is higher than 30C, when overclocked & overvolt, VRM1 can go up to 80s Celsius even when water cooling. 80s Celsius is well below & safe according to specification but I prefer running them at lower temp if possible & not to forget kinda silly to have VRMs go over 60C when water cooling.

I guess it just depends on what you consider silly. I think it is silly to spend $20 just to take 15C off the already very safe 60C VRM temps. Other people would gladly pay twice that - it just depends where your priorities are and what your current situation is. But either way, you don't *need* to replace the stock pads, it's optional.
Edited by Forceman - 3/6/14 at 10:27pm
post #18523 of 43924

If you are running two GPU's you will not see a big diference in temps, but running 3-4 GPU's there is a a sizeable difference in temps.

In my 7970 quad, there is an 11c difference between serial vs parallel

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post #18524 of 43924
I think i found my max overclock for now.

PSU tripped with my 8350 at 5.168Ghz @1.69v and my 290's clocked at 1250/1550 with +175mV in Trixx, didn't have my voltage meter plugged in at the time (wish i did) but that means it went well over 1200w
 
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post #18525 of 43924
Quote:
Originally Posted by Forceman View Post

Warning: Spoiler! (Click to show)
Quote:
Originally Posted by kizwan View Post

True but it just silly to have VRM1 running @60s Celsius when water cooling. VRMs on my previous AMD GPU running cool in 40s when water cooling with EK water block. If low ambient (indoor) temp, the max temp maybe @60s Celsius but if ambient is higher than 30C, when overclocked & overvolt, VRM1 can go up to 80s Celsius even when water cooling. 80s Celsius is well below & safe according to specification but I prefer running them at lower temp if possible & not to forget kinda silly to have VRMs go over 60C when water cooling.

I guess it just depends on what you consider silly. I think it is silly to spend $20 just to take 15C off the already very safe 60C VRM temps. Other people would gladly pay twice that - it just depends where your priorities are and what your current situation is. But either way, you don't *need* to replace the stock pads, it's optional.
Yeah I agree with you 60s or 80s Celsius pretty much safe but I'm not talking what safe. I'm talking what you *should* get when water cooling. If you already spends a lot of money for water cooling, it's kinda silly if VRMs still running at that high temp. Might as well stick with stock reference cooler because it does did a great job in cooling the VRMs.

Yeah my bad for saying "need". "You might want" is more appropriate. Seriously, VRMs above 60s Celsius with water cooling is just silly, unless you're water cooling just for aesthetic which that's fine with me.
Quote:
Originally Posted by Red1776 View Post

If you are running two GPU's you will not see a big diference in temps, but running 3-4 GPU's there is a a sizeable difference in temps.


In my 7970 quad, there is an 11c difference between serial vs parallel
For quad, better run "hybrid" (parallel-serial-parallel) though.
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post #18526 of 43924
Quote:
Originally Posted by kizwan View Post

For quad, better run "hybrid" (parallel-serial-parallel) though.

parallel >> series or hybrid/mix on 3 or 4 290Xs, you need a LOT of water flowing through them, which only parrallel is really adequate, otherwise one end of your cards will end up hot due to the water not having enough/any thermal capacity left.

if your CPU, RAM and/or NB blocks aren't too restrictive though, you can run the rest of the system all in series, like @Red1776 for his 7970 quadfire (only CPU+GPUs), BUT you would need a radiator between these and the cards, the cards need cool water.
   
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post #18527 of 43924

right, full parallel yields the best results, but as I said it takes a lot of flow to do. I am running full parallel with my new quad R290x rig with 4 pumps and 5 rads.

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post #18528 of 43924
Quote:
Originally Posted by Paul17041993 View Post

Warning: Spoiler! (Click to show)
Quote:
Originally Posted by kizwan View Post

For quad, better run "hybrid" (parallel-serial-parallel) though.

parallel >> series or hybrid/mix on 3 or 4 290Xs, you need a LOT of water flowing through them, which only parrallel is really adequate, otherwise one end of your cards will end up hot due to the water not having enough/any thermal capacity left.

if your CPU, RAM and/or NB blocks aren't too restrictive though, you can run the rest of the system all in series, like @Red1776 for his 7970 quadfire (only CPU+GPUs), BUT you would need a radiator between these and the cards, the cards need cool water.
I'm not an expert on this subject. I only read about it at OCN water cooling club thread. Read it here & here. It seems "hybrid" is best practice for quad GPU.
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well it comes with a caveat that there are many variables to take into account. I have tried all three methods after have extensive conversations with B-Negative and jow at FCPU who has been in contact with Skinnee labs and parallel yielded the best results for me. I came to the conclusion that the hybrid potion is to maintain pressure to avoid the air that gets into the hard to fill wide surface area that is found in all full cover blocks. I employ a tremendous amount of flow/pressure with multiple pumps running at the correct speed.

I would not try to spend time talking anyone else into it, but it yields the best results for me.

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post #18530 of 43924
Quote:
Originally Posted by Red1776 View Post

well it comes with a caveat that there are many variables to take into account. I have tried all three methods after have extensive conversations with B-Negative and jow at FCPU who has been in contact with Skinnee labs and parallel yielded the best results for me. I came to the conclusion that the hybrid potion is to maintain pressure to avoid the air that gets into the hard to fill wide surface area that is found in all full cover blocks. I employ a tremendous amount of flow/pressure with multiple pumps running at the correct speed.
I would not try to spend time talking anyone else into it, but it yields the best results for me.
Haha. Sorry if I'm seems to argue with you about your parallel config with quad GPU or challenging your knowledge in any way. It's not my intention, because like I said, I'm not an expert on this subject. I only mentioned the information I read at OCN water cooling club. I don't just believe what I read in forums but I always take interest in any information posted by reputable member like BNEG & Darlene.

If I'm going quad, I'll definitely going "hybrid".
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