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Watercooling 2x GTX690

post #1 of 128
Thread Starter 
Hi,
I had this posted in the Nvidia section ( i now realize that was a stupid move on my part) and was advised to get it moved here, i dont know how to move a thread, so i will just repost smile.gif

my 690s are both getting very hot now that its summer (80c+ in games) so my room is being heated up to about 33c which sucks D:
i am going to watercool the 690s ONLY as i am happy with my h100 as it would be doing a perfectly good job if my cards weren't exhausting into the case causing my cpu to be around 10c hotter frown.gif so when i get my 690s watercooled with the Rad in the psu side of my case the h100 will go back to keeping my 3930k at around 30c.
As this will be my first custom loop i have no idea what to get...
i would like it to be as simple as possible with as few connections as possible (best case scenario would be a radiator with res and pump integrated in it so i only need tubing going from the card to the rad so there are as few points for it to leak as i can get.) as i am not comfortable with this.. terrible anxiety problems + no more money to replace wet 690s + low self esteem = not happy about watercooling xD
so what parts should i buy for this? if possible please list parts available in the uk.

Thank you smile.gif

P.S. Res size can be 360mm for anyone who is not familiar with the M8. I would also like to keep the front of my case clean with no drive bay reservoirs, which makes an integrated pump + res in the rad even more ideal
I will be ringing Specialtech about the availability of this rad tomorrow, hopefully they will be getting more soon as i would love this : http://www.specialtech.co.uk/spshop/customer/Swiftech-MCR320-Drive-Rev3-Series-360mm-Triple-Radiator-Heat-Exchangers-with-Integrated-Pump-and-Reservoir--MCR320-DRIVE-R3-pid-14797.html

EDIT: i am now considering cooling my cpu too as if i am going to break my cards i might as well break my cpu too.
Edited by Xotic - 8/12/12 at 7:47am
post #2 of 128
Definitely cool your cpu too, that should be automatic. GTX690s are listed at 300w TDP but depending on how they're run could be over 400w which is in direct contrast to what Nvidia spec the TDP at.

Anyways, I would not get a Drive rad. I'd get a proper pump plus res and at least two 480mm rads or at least 960mm of rad surface. You have a big case so use it. I would then mate the rads with the highest static pressure fans at 1000rpm, but they would have to have more speed than that for rainy days.

Btw, if budget is a concern, then you need to ask yourself how serious you are because it isn't cheap and judging by your rig... seriously?
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post #3 of 128
Thread Starter 
Quote:
Originally Posted by tsm106 View Post

Definitely cool your cpu too, that should be automatic. GTX690s are listed at 300w TDP but depending on how they're run could be over 400w which is in direct contrast to what Nvidia spec the TDP at.
Anyways, I would not get a Drive rad. I'd get a proper pump plus res and at least two 480mm rads or at least 960mm of rad surface. You have a big case so use it. I would then mate the rads with the highest static pressure fans at 1000rpm, but they would have to have more speed than that for rainy days.
Btw, if budget is a concern, then you need to ask yourself how serious you are because it isn't cheap and judging by your rig... seriously?

Well budget wise.. i am 18, no job, and i am just burning through the money i got from when i turned 18, and now here i am having gone from £5500 to £1100, i also still need a laptop for the next year of college. so i need to make it fit into the £1100 - a laptop, unless i can get some more money somehow. so i dont want to be spending all £1100 on the watercooling.
So you can see i REALLY cannot afford for my parts to be broken by a leak frown.gif

i have decided i would like to put my cpu under water now, as i want to go back to at least 10th place on 3dmark11 extreme preset.. but i will leave my motherboard as i dont think that needs to be cooled.

is that amount of rad space really needed? i can only fit 360mm rads in this case, and a max of 3, but that is alot more connections where it could possibly leak, and the thought of that makes me want to cry D:

and really? 960mm MINIMUM? that seems way over the top to me..

thank you for the reply biggrin.gif keep them coming, i want to do this soon
post #4 of 128
Quote:
Originally Posted by Xotic View Post

and really? 960mm MINIMUM? that seems way over the top to me..
thank you for the reply biggrin.gif keep them coming, i want to do this soon


I don't know what your goals are, if you're deaf or not, but I don't want to be beat up a loud waterloop. It takes an almost 1:1 relationship of rad mm to wattage to achieve low noise and top performance. Your rig is going to draw around 1100w of heat full tilt. You've got 4 gpus and a very hungry cpu. Do you think you could cool that with a 360 while not being bludgeoned by noise?
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post #5 of 128
Thread Starter 
Quote:
Originally Posted by tsm106 View Post

I don't know what your goals are, if you're deaf or not, but I don't want to be beat up a loud waterloop. It takes an almost 1:1 relationship of rad mm to wattage to achieve low noise and top performance. Your rig is going to draw around 1100w of heat full tilt. You've got 4 gpus and a very hungry cpu. Do you think you could cool that with a 360 while not being bludgeoned by noise?

not with a single 360, but i was thinking 2, 1 360 for the gpus and 1 360 for the cpu, that was what i was hoping for smile.gif
i am used to high noise from my pc, but i wear headphones so its not that bad.
so how would 2 360mm rads be with 6 sp120 quiet editions per rad work for this? cause i mean, if my h100 can cool my cpu just fine as a 240mm rad, i dont see how a 360mm could be any worse?
post #6 of 128
You're trying to essentially cool 4 gpus and a CPU with 2 360mm rads. Honestly just use those 2 new rads on gpu alone and stick with the H100 for CPU. tsm106 is right those cards are at 300 watts of heat generated. You'd need to dissipate 600 watts of heat, and the general rule of thumb is around 100 120 watts dissipated per 120mm rad space. So for 600 watts you need at minimum (given what tsm106 said about up to 400 watt) 2 360s for the gpus alone.
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post #7 of 128
Thread Starter 
Quote:
Originally Posted by PhantomTaco View Post

You're trying to essentially cool 4 gpus and a CPU with 2 360mm rads. Honestly just use those 2 new rads on gpu alone and stick with the H100 for CPU. tsm106 is right those cards are at 300 watts of heat generated. You'd need to dissipate 600 watts of heat, and the general rule of thumb is around 100 120 watts dissipated per 120mm rad space. So for 600 watts you need at minimum (given what tsm106 said about up to 400 watt) 2 360s for the gpus alone.

Okay, well i guess there is no way around that then xD i will have to buy 3 360mm rads, now the question is which ones D:
can someone help me put together a shopping basket on a uk site with everything that you would put in it if it were your build? i have no idea what i need for it and what is best.

thank you smile.gif
post #8 of 128
From what I see looking at Martins Liquid Lab roundup (http://martinsliquidlab.org/2012/04/14/360-radiator-shootout-summary/), I'd probably go with the HW Labs Sr1 360 as it offers the least restriction with the most heat dissipation.

I don't think anyone will help you out together your list but if you put up what you're thinking of getting after reading through the water cooling stickies here people will definitely give you input. In general what you're gonna need is this

2 gtx 690 waterblocks (right now the ones available are xspc, ek, heat killer, and Evga I think that's it)
A pump
The radiators
A reservoir
Tubing
Fittings (either compression which I would reccomend or barbs)

For every piece of tubing between each component you need two fittings

What I would do is get a photo of the inside of your case and start drawing out where things will go and make sure it makes sense. Do that and post it online and I'll definitely help from there.

Edit don't forget fans for the radiators!
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post #9 of 128
Thread Starter 
Well i am about to buy a pedestal and extended top for my M8 depending on the postage, so placing the rads will be easy, i just have to find places for the pump and res, which is my problem, i cannot decide if i should have more than one loop either, would it be less likely to leak if i have it all in one loop? or should i have 2 or 3 separate ones?
i am thinking about getting the koolance blocks for my 690s, but if they are not in stock this week, i will go for xspc if i can find some more information out about them, the sli flow bridge looks really ugly:



Do i need a big reservoir? or does the size not make a difference in temps?

Thanks for the help smile.gif
post #10 of 128
A bigger res means its easier to bleed the loop of air. I have the xspc block on my card and I think it looks slick ESP with the led mounts (gonna be using white LEDs). Stick with a single loop, no need for more hassle. There are plenty of people out there who use your case just do a google. Search for case labs m8 build log and see how others have planned it out for ideas thumb.gif
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