Water Cooling Path?

[MrQnator007]

I have been on a planning spree today for my upcoming (first) PC build, and due to the capability of my case to have water-cooling, plus having two crossfired Sapphire Radeon 7990 HDs, I have decided to go with water-cooling. I have done my research, and so far, I have chose some top-reviewed parts and tried going through the path. These are my parts so far-

Case: Aerocool XPredator Devil Red
Reservoir: Monsoon Series Two D5
Pump: Swiftech MCP665-B
Top Rad: Black Ice GT Stealth 280
Bottom/Rear Rad: Black Ice GT Extreme 140
GPUs: Sapphire Radeon 7990 HD Crossfire, each is a dual-GPU
GPU Waterblocks: 2x Swiftech Komodo HD7990 Full Cover

(No connectors yet, not going to research some until I am certain of path)

I have generated two paths, and I'm not sure as to which is the better choice, and which will have the greater benefit towards the cooling of each component. The case is capable of holding 1 140mm fan in the rear, 1 140mm fan on the bottom, and a 2 x 140 Rad on the top. Being that I want to have the GPUs cool, I want to ensure that there are radiators in each spot. Hopefully this doesn't restrict airflow in the case though. The four fans in the side panel should take care of this problem.

First Path:

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Second Path:

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If there is a third path that would make this better, please let me know. Any help will be appreciated. So far, I have had no problems with the fast responses on this site.

P.S. I have no idea what the HTML text beneath the pictures is doing there, I know HTML and know that I didn't type that at all :\

 

[endeavour37a]

The order of the components in the loop have no bearing at all on the temps once the water temp is stabilized. So pluming it the shortest and cleanest way possible is what you would like to do.

 

[Hard Line]

well I would pump to the top rad first.. this allows gravity to assist the pump so you will get slightly higher flow. with 2 gpus and a cpu 480 worth of rad is a bit close but should be doable. Just don't expect 10C air to water deltas

 

[MrQnator007]

The order of the components in the loop have no bearing at all on the temps once the water temp is stabilized. So pluming it the shortest and cleanest way possible is what you would like to do.

Ok, thanks. Short & simple = better.

well I would pump to the top rad first.. this allows gravity to assist the pump so you will get slightly higher flow. with 2 gpus and a cpu 480 worth of rad is a bit close but should be doable. Just don't expect 10C air to water deltas

Ok. Do you think a setup like this would work?

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[Hard Line]

yes that looks good and similar to how mine is set up. I do agree it only affects temps 1-3C ( depending on rads and fan ) so based on that set it up any way you like however I find letting physics help the pump wouldn't hurt and could potentially reduce the load on it. which is why I do it that way.

 

[endeavour37a]

well I would pump to the top rad first.. this allows gravity to assist the pump so you will get slightly higher flow. with 2 gpus and a cpu 480 worth of rad is a bit close but should be doable. Just don't expect 10C air to water deltas

Just out of curiosity and not to be argumentative I was wondering how gravity would have an effect in a closed loop? The only thing I know about the importance of a loop is it is good to have the reservoir feeding the pump (in front of it with respect to flow). It seems gravity pulling the water down would create a natural siphon to equalize the pressure and pull water up. I could be wrong though...just wondering.

 

[MrQnator007]

Ok, thank you so much for your help. I can now move on to picking out the tiny pieces and tubing, LEDs, and the finals steps of planning my build!

 

[MrQnator007]

well I would pump to the top rad first.. this allows gravity to assist the pump so you will get slightly higher flow. with 2 gpus and a cpu 480 worth of rad is a bit close but should be doable. Just don't expect 10C air to water deltas

Just out of curiosity and not to be argumentative I was wondering how gravity would have an effect in a closed loop? The only thing I know about the importance of a loop is it is good to have the reservoir feeding the pump (in front of it with respect to flow). It seems gravity pulling the water down would create a natural siphon to equalize the pressure and pull water up. I could be wrong though...just wondering.

Yeah, I was wondering the same. Either way, there will be a time to go up and a time to go down in the cycle. I'm just going to go with the one Hard Line proposed to be safe.

 

[Hard Line]

Gravity would assist the pump while the water goes through the blocks and rads which are more restrictive than the tubing to go back up to the pump. and yes the pump does pull and push the water through the loop.

 

[MrQnator007]

Gravity would assist the pump while the water goes through the blocks and rads which are more restrictive than the tubing to go back up to the pump. and yes the pump does pull and push the water through the loop.

So no matter what, the pump will still have the same amount of resistance when it tries to push the liquid up, being at one point in the loop it'll have to come downwards, and will eventually have to come back up.

 

[Hard Line]

there is much less resistance pushing the water up in the tubing ( no restrictions from rads and blocks ) and the gravity assists going down through the blocks