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750D Watercooling Questions - Build Soon

post #1 of 4
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I have been wanting to water cool my pc for the experience and performance of it for quite some time now and finally made the first step in the process by getting a case that would support proper radiator sizes. I was excited from the first time I saw the 750D and knew that this would be a case I would enjoy working with while still being an affordable price for the functionality it contains. I have been looking at many, many builds for their layouts, parts used, modding ideas, and general do's and don'ts. I am left with a few questions so that I can truly get this ball rolling in the most appropriate fashion.

My first question, which is more of a modding idea to see if anyone else has attempted, is if anyone has worked out the possibility of fitting a 360 in the front of this case. I have looked over many of the posts, google searched, and measured out myself a bit and feel like a 360 rad, if slim enough, could fit in the front without messing up the top 360 rad positioning. My measuring and speculation, however, is not the same as someone with parts on hand putting them up to the case to see. I do intend after work tonight or tomorrow morning to make some mock up rad sizes out of poster board to see if I can get a more concrete answer myself. I am aware that the 5.25 bays will be gone, which is not a huge loss to me, but also I will have to come up with a new filter system for the front of the case to filter all of it.

If I were to do this, I was thinking about two (at the very least the front rad only) Alphacool NexXxoS ST30 rads as they seem to have good performance, good cost, and a size that might be easier to work with for the idea. I know that on the top you can fit something like 60mm rad with push or pull and easily a 60mm rad in the front push or pull, but that is mainly because they wouldn't interfere with each other for tubing. Finding out performance numbers for these things is easy enough really, but I am still new so its easy to become a bit intimidated by it all.

I am planning to cool an OC"d 2500k that can go up to 4.8 on air (I backed down due to temps) and one 780 that clears 1200mhz. I will most likely add another card into the loop if the prices go down anymore just for the performance of it.

Any help on this is greatly appreciated! I know a lot of this is just throw ideas around but any outside info is always a help to me. The rest of the system will be pretty easy to figure out. Some sort of compression fittings, a tube res of some size, acrylic tubing (most likely frosted), and a D5 pump. The blocks for the i5 and the 780 will probably be the last thing I come up with just so that I can pick something that will perform decently while going with the theme of the build.
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post #2 of 4
Disclaimer: I do not own this case, so my thoughts should be taken with a grain of salt. Also, this is more of a bounce some ideas around ramble.

For clarity:
  • I'm assume by 750D you mean the Corsair Obsidian 750D.
  • I'm not sure what you mean by 'slim' enough. Since the hard drive bays can be removed/repositioned, you should have plenty of room for the thickest of radiators in a push/pull fan configuration. The height issue is of more concern (distance between the bottom of the case to the bottom of the 5.25 drive bays.)

Based on the (hopefully) to scale-ish manual drawings, you can barely fit 3x120mm fans. With a radiator, you also have to factor in space for the fittings and plenum chamber(s).

Alphacool NexXxoS ST30 Technical Drawing:
Code:
http://www.alphacool.com/download/120-360-30.pdf

Depending on how far you want to mod your case, it looks like you'll need to pop out the whole 5.25 drive bay assembly if you want to keep the front 360mm radiator. Worse case scenario, you'll be cutting the steel with a Dremel or something; best case scenario, you will be able to drill out some rivets/remove the screws securing the drive bay to the case frame.

Let's say you can fit your 360mm radiator in the space given. Now you'll have to think of a way to mount the thing itself. The weight of the radiator + fans + water/coolant is a factor to consider (depending on if some exotic method is used to secure the front fans.) Also, what happens if the mounting holes do not line up with the radiator's screw threads? In this case, I would suggest machining your own radiator mounting bracket.

From personal experience of my last build (using a Lian Li PC-A76), I machined my own radiator bracket from 6063 aluminum which allowed more flexibility in placing my front 360mm radiator. [Aluminum is much much easier to work with than steel.]

But this is all in the fun of water cooling/case modding! Good luck! (:
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post #3 of 4
I bought a 750D with which I replaced my 650D.

In my modded 650D I was able to perfectly fit a XT45 up top with a Monsta 360 up front including a CW611 at the top bay slot. However the front radiator came up about 1/4" - 1/2" past the top 5.25" drive bay but did not matter much as it was just a CW611. I would believe that it should be just as doable in a 750D given that it is 1-2" taller with the added benefits of that extra height giving more clearance. This is with the assumption that you are modding the 5.25" bay in one form or another, or removing it entirely.

Yes, you have about 85±5mm of space for the top radiator (depending on your motherboard) so you can do a UT60 push or pull, and for the front you can definitely fit something big like a Monsta push and pull while still having plenty of room for a cylinder reservoir and pump room down bottom (same for pump top/res combo). One quick word of advice, 80mm reservoirs might be a tight fit, I have an AquaComputer top/reservoir setup and my 7950 comes within 1/8" of the reservoir. I might end up doing a slight mod by removing the bottom part of the 5.25" bay cage so I can shift it further sideways.
Edited by hiarc - 11/5/13 at 6:05pm
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post #4 of 4
Thread Starter 
That is exactly the info I was looking for with the comparison to the 650D. I would completely remove the 5.25 bay as I have no use for it anyway. I already spoke with someone else who has drilled out his rivets to remove the bay with much success.

I do not think I would go for a monsta rad size, even with its performance, as it would possibly come too close to my 780 and limit the use of a cylinder. I would also like to get as close to the same size and type of 360 as possible.

Pryat - From the looks of things, after removing the 5.25 bay, I should be able to mount the lower 240 worth of rad naturally to the already given mounting holes. The last 120mm worth of rad could either be unmounted with a fan affixed to the front of it, or I could do as you said and make my own mounting bracket. I am uncertain of how much support would be required if 2/3rds of the rad is already mounted in place.

The only reason why I want to do this is that I have near no use for the 5.25 bay and want to maximize my rad space while still having a clean, balanced interior layout. I feel that the most difficult part of all of this will be coming up with a filter solution for the front after installing the water cooling system.
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