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Cpu Only loop 2 x 120.3

post #1 of 8
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After killing another 88800 Ultra I have removed having gpu blocks in the equation but this has now left me with a Q6600 being cooled by a Fuzion, a D5 and 2 x 120.3 radiators.

Surely those two radiators would pull almost all the (above ambient) heat out of the water before it gets back to the cpu but the cpu still gets reasonably warm with a decent overclock and stress testing.

Does it become a case where you reach a point where you can only move the water around the loop so fast etc

Radiators have 6 fans pushing from the front through and 1/2" hose all round.

Love to hear from Martin, Ira and the other tinkerers .
post #2 of 8
Yes it probably does since the pump and or water block (flow rate or just block design) would be holding you back because clearly it's not your radiators).

But I think once you've reached that point, that's about as good as you are going to get. I'm curious, what are your temps like now (using coretemp) on the quads with 2 PAs running? Must be nice!
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post #3 of 8
Hi Cog, Flattery will get you everywhere.........A rad or rads will only get you down so far temp wise, you can have a wall of rads and after a certain point it wont lower your temp's anymore, which will be above your room ambient no matter what at idle with plain WC'ing....

What over radding can do is prevent temp spikes to a certain degree...But adding the extra restriction from to many rads can also hurt temp's..Since you already have 2 of the PA.3's and if you have the D-5 vario and its a CPU only loop it wouldn't hurt at all to run both of them if you would like to...I'd probably just use one myself to try and keep my water velocity higher so it will be more turbulent through my rad and blocks...The more fittings, the more blocks and rads and tubing, the more likely your flow can turn laminar on you and also will lower your water velocity...With laminar flow the heat will pull back into the center of your coolants flow,that hurts you temp's you want the heat distributed all through the flow so it will dissipate as much heat as possible when it hits your rad, the more turbulent it is through your blocks the more heat it will pick up also...The more head/energy /velocity you can keep up in your loop the better your temp's will be as long as you don't have to much heat dump from the pump, and your fine temp wise with that pump or even 2 in series...I would use the 18W DDC w/top or the 50Z for series pumps for the lower heat dump...

As far as how much flow is enough and how much is to much depends on personal opinion...With the D-5 and 2 PA's and your block you will probably be looking at around 1.75 to 2gpm give or take a bit...Really anything over a 1.5gpm is plenty I think, but I like to keep mine over 2gpm at least because i think it helps to cool the little hot spots on the chip that the sheer volume of flow will help cool, it might not lower over all temp's at all but it seems to help clocks a little..So even if adding a second pump in series only lowers overall temp's 2C it may or may not let you push your OC higher.So your good with that pump...

Hey those are some nice clocks in your sig.......How do you like WC'ing now?

EDIT: If you are wanting to use real low cfm fans on your rads it might make more sense to use 2 rads for the extra surface area...
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post #4 of 8
according to martins flow rate calculator (thx martin) flow shouldn't be a problem (~1.98 GPM - "great" flow) so i guess it would be nice if you could post a picture of your loop.
i'd also like to know what your ambient temps are and what temps your cpu is getting.
    
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post #5 of 8
Quote:
Originally Posted by cognoscenti View Post

Does it become a case where you reach a point where you can only move the water around the loop so fast etc
Well, you could always move the water faster, but you might want tighter hose clamps if you go too fast. Pressure also increases heat so I imagine there's a happy medium you have to aim for. Gotta give the radiators some time to do their work.
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post #6 of 8
Yeah, it won't hurt anything to keep both rads in the loop, probably still a very small gain over removing it and the very small added flow rate.

With an MCR320 I get load temps of my E6600 that are about 3.5C over ambient. A quad can run twice the heat load, so you might have 5C over ambient with one rad, running two probably gives you another 1-2C cooler.

Only thing you can do at this point is tinker. Make sure you have nice cool air running into the radiators and that you'r not circulating hot old air. Also make sure you have a good mount, and you might consider a different thermal compound.

That's about all you can do with regular water cooling and some processors just run hot, and most quads DO run pretty hot.
    
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post #7 of 8
if i remeber correctly u had full cover blocks on those GTX? was the heat dump that severe that it killed ur gpu's? if that was the case i would have ran an complete diff loop for the gpus alone. just my .02
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post #8 of 8
Thread Starter 
Thanks for the input guys!
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