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P5N32 -E SLI, should I stay all water once started? - Page 3

post #21 of 45
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Quote:
Originally Posted by DarkJedi View Post
Morning all!

From what I've read so far, it isn't absolutely necessary to cool the SB on our board, so one can leave that out of the loop to keep the water heat and costs down.

As a temporary fix, have you tried a 40mm fan screwed to your northbridge heatsink? I did that and it made a noticeable difference in stability.

I'm thinking I might risk CPU, NB and GTX in one loop, and sort out a replacement passive cooler for the left bank of mosfets, and see how that goes.

I know given the hot parts in the loop it isn't ideal for mega overclocks, but hopefully it should provide a half decent o/c quietly...
Once I start cooling the NB id have to get a block also for the left mosfet. The question is what causes instability, the mofets SB or NB or is it a combination of all. I will have the SB and top mosfets still pasive. There is a asus mosfet fan and I could try a 40mm fan but as you know the small fans have to run at high RMP which creates a whinning sound, unless you know of a 40mm fan thats silent?

I had a AMD sandy 3700+ @ 2.8ghz, DFI chipset and X800XT all on the same loop. As I sold each block I was finnaly left with the cpu only being cooled, the temps didnt change. The Gfx card was below the temp of my CPU and the chipset was also around the same temp as my CPU, it made no difference.

Now, I dont know what temps the chipsets get to on these boards so its hard to tell, but You may get away with the GFX card in the same loop as the CPU as long as the card is the same or below the CPU temp. I dont know if it realy works out this way but it sure did look this way on my last set up.

When you say it made your system more stable with the 40mm fan, did you mean you could clock higher than without it? My system is 100% stable at 3ghz. Unless I can jump to at least 3.4ghz I dont think id notice the difference to warrent the extra noise.
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post #22 of 45
Quote:
Originally Posted by tecy120 View Post
The question is what causes instability, the mofets SB or NB or is it a combination of all.
I think its a combination, BTW this is my second board after first one died.
possibly caused by using aftermarket cooling on the NB and SB but not the mosfets.


Quote:
Originally Posted by tecy120 View Post
Now, I dont know what temps the chipsets get to on these boards so its hard to tell...
Extremely hot is the answer, esp the NB.

Quote:
Originally Posted by tecy120 View Post

but You may get away with the GFX card in the same loop as the CPU as long as the card is the same or below the CPU temp.
If they are using an 8800 (which run in the 70c+ region with aircooling) and then try and cool the cpu with water that has just run over that gpu chip I can forsee water capable of making a cup of tea....
post #23 of 45
if ur cooling the cpu/nb/sb/mosfets/gpus thats alot of restrictions on 1 loop. u might want to rethinking this and maybe use 2 sperate loops.
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post #24 of 45
Quote:
Originally Posted by tecy120 View Post
When you say it made your system more stable with the 40mm fan, did you mean you could clock higher than without it? My system is 100% stable at 3ghz. Unless I can jump to at least 3.4ghz I dont think id notice the difference to warrent the extra noise.
Hi sorry for the late reply, mental day!

Yes, adding the fan definitely improved my ability to overclock. I'm running at 3.1GHz solid through Orthos, whereas without the fan it's deffo below 3...
I'm almost certain it's just the NB that holds us back, as I can get into Windows for a while at 3.5 from a cold start (CPU temps are fine - they have sole use of a triple rad!) but the NB gets that Ready Brek glow pretty quick...

Quote:
Originally Posted by cognoscenti
Personally i would cool the graphics last.
To me it makes more sense.

Cooling the board and cpu facilitates a high yet stable overclock and you can achieve a decent overclock with air on the graphics until you get around to watercooling them.

Doing it the other way you have a cool cpu and graphics but a board that is not sufficiently cool to support the high overclock.

Just my novice opinion.
Novice? Heh, hardly!

Meh, there's no cutting corners here is there! I need that second loop and I guess a rad at the front of the case. (Should be able to squeeze a double there). I wonder if my current pump would power both loops or whether an upgrade/secondary one is needed for that too?
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post #25 of 45
Best to get the second pump otherwise you will not get a good flow rate, so getting the second pump like a D5 would be the first thing. You can have your loops like this,
res>pump>rad>cpu>gpu
res>pump>rad>sb>nb>mosfets
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post #26 of 45
i water cool my NB n SB with the wee Swiftech waterblocks, you dont need anythink special! with a wind'y route adding super restrictions as the nb and sb thermal load it tiny, gets very hot still.

cooling the NB is often the key to the high OCs as the NB is what goes hand in hand with the cpu working with a high fsb.

cooling the SB is far less neccesary but i didnt want the SB getting jelous so treated that to a block aswell at £13 / $26 why not

As for Mosfets......i really cant see ANY point in watercooling them, looks good but you will get no gain from it. mine run very cool now they dont share a hatsink with the chipsets. made a money? go 4 it but id say its un-necessary restriction and my mobo is allready quite crowded with tubes
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post #27 of 45
Thanks Asce! Interesting that you put the CPU & GPU together, and the bad boy NB pretty much on its own, hehe!

Quote:
Originally Posted by marc.tulley View Post
i water cool my NB n SB with the wee Swiftech waterblocks, you dont need anythink special! with a wind'y route adding super restrictions as the nb and sb thermal load it tiny, gets very hot still.
Do you have those on the same loop as the CPU? Any w/cing of your GPU?

Quote:
Originally Posted by marc.tulley View Post
As for Mosfets......i really cant see ANY point in watercooling them, looks good but you will get no gain from it. mine run very cool now they dont share a hatsink with the chipsets. made a money? go 4 it but id say its un-necessary restriction and my mobo is allready quite crowded with tubes
Now THAT is a highly valuable bit of info for techy120 and I, thanks! Do you run active cooling on the mosfets now, or just passive? I'm guessing the latter... Reps!
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post #28 of 45
Thread Starter 
Lots of good info here, geat to see a nice amount of responces. The Idear of just cooling the mosfets pasive will cut alot of expence, not to mention the crazy amount of tubing that will be in my system lol, all 1/2".

I wonder if these are any good for the mosfets on this board?
http://www.sidewindercomputers.com/swmcmohe.html

As for cooling the NB surly wont the blocks that use 10mm tubing do?
Im not too bothered to WC my Gfx card to be honnest as to me it just is uneeded expence, Iv never seen that much of a great boost by OC a graphics card.

ON the other note, If I dont have to replace my SB I can then carry on using my sound card that covers the SB. Also this means that one of the mosfet heat sinks will remain, so il only need to cool the upper mosfets that are connected to the NB.
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post #29 of 45
Yeah my loop is going to be res>pump>rad>cpu>nb>rad when i get my money to get the parts i need. An easy way to get around w/c the mosfets would be having some kind of fan blowing towards them. You can get a low restriction nb block like the Swiftech MCW30.

Those mosfets you linked to look good. And use 1/2" or 7/16 tubing for flow rate
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post #30 of 45
Quote:
Originally Posted by tecy120 View Post
ON the other note, If I dont have to replace my SB I can then carry on using my sound card that covers the SB. Also this means that one of the mosfet heat sinks will remain, so il only need to cool the upper mosfets that are connected to the NB.
Well, I've read that other people cut heat-pipe from the NB, seal it off and continue to use the stock heatsink on the left hand mosfet bank...

Lazyd on this board used one of these instead, but he had to hacksaw the end off
See here and here...
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