It is probably a bubble. Be sure to do like Taylor Swift says and shake it off.... LoL. Sorry, terrible joke.

zophar



Like Scarlet said, sounds like an air bubble. But just to make sure and please don't take offense to this but you did put some kind of thermal paste on the GPU core correct?

Don't you look at me like that.

I have been staring at the picture of your loop. When you tear it down to clean it, you can definitely streamline the tubing. Right now it goes pump, a really long distance to rad 1, gpu, long distance to rad 2, cpu, res then pump.

This isn't bad, but if you went pump, gpu, cpu, rad 1, rad 2, res then back to pump, you would reduce the distance you need to move the water without raising your temps more than 1 or 2c. This would also put slightly less strain on your pump, since it isn't dealing with as many bends and it clean up airflow over all.

It isn't a requirement at all, but it would be helpful and really clean up your rig.

If you want an EK Acetal Pump top for your D5 pump, send me a pm or let me know. I will ship it out Friday, free of charge. I will also include 2 fittings, depending on your tube size, to fit...

I only request that you also take Zophar advice and mount the pump properly so it doesn't stress the hose over time.

You might consider a res/pump housing.  That way you loose some tubing and fittings and start to clean it up. It is what I have currently in my setup. It came with a kit. You can find a ton of options at
 
www.frozencpu.com
or 
http://www.performance-pcs.com
 
After I run furmark for about 10 min my temps run up to 60C on my gpu so I would not be too worried if that is what you are getting to..
 
 
 
 
 

I have a reservoir in the front of my case under my dvd drive. the reservoir feeds into the pump. pump into 120mm radiator in rear. 120mm radiator to gpu. gpu to 240mm radiator on roof. 240mm radiator to cpu. cpu back to reservoir

Hey Markc999,
 
I drew this up for you, just for some ideas for the future.  When you tear everything down for cleaning, which will need to be done, I put this together...
 
This is your old loop. 
 

 
and this would be my suggestion.
 

 
 
This would reduce your tubing a lot. and with line 2, where it goes into the GPU, I would use a 45 or 90 rotary fitting to make the bend.  They are only $5 each.  
 
Line 4 between the two radiators, I would do the same thing, putting a 90 degree rotary on the 240mm so that the tub isnt bent.  
 
 
I know you don't want to redo it right now, but when you have to take it apart for cleaning, it may be a good idea over all.  
 
Did your bubbles ever break loose?
 
 

actually i have a dilemma! apparently (because my reservoir had no instructions) i put my in/out connections to my reservoir reversed. so my in is going out and my out is going in. i had it right my first setup but for some reason water wasnt going to my pump so i switched them. im thinking if i switch them once more...(ughhh) then maybe it wont be sucking up air anymore? here's the link to the reservoir i have            Do you think its mandatory that i switch them to how theyre suppose to be used? My main problem with redoing all my tubing is that barbs are a pain!!!!!! to remove. I cant pull my reservoir out the front of the case to easily remove the connections because the tubing is a little tight. I didnt expect to have to remove them as often as i am. also...im running short on tubing and my easiest way to switch tubing is to snip them and use new tubing

ive lost the link sorry lol but its the xspc 5.25 bay reservoir. the single bay, not double. i ended up just reverting to my "swiftech mcres micro revision 2 reservoir" because i figured it would be easier to empty/fill the reservoir due to its size(small). I used what tubing i had left and made it fit. of course it's not the neatest, but Im not really into making my pc look sick. I just want it to run smoothly & cool. Ever since I switched the reservoir my pump is extremely quiet because theres not much air in the loop now. I also tried the same game i tried before with my older loop and it ran around 5-8c cooler with my new setup. i'm happy with that, although I would be even more happy if the temps were down in the 40s and not 50s. here's a pic of it now. the wires hanging next to my hdd bays are my window fan connectors to my fan control. I also used some Velcro to support the pump & for the reservoir...I already know someones gonna be disgusted with me but it gets the job done lol. the bottom pic is my reservoir chilling in one of my 5.25 bay drives. Ive done my best to get all the air out of the reservoir but there remains a little no matter what I do so I lean it at an angle so the air doesnt get sucked back in the loop. The thing I use to angle the reservoir is a duracell AA 4 pack folded up hahaha. 

You should think to connect pump and reservoir and install near motherboard or connect with HDD cages.
Loop will be more simple and probably little better temps.
pump > gpu > radiator 1 > cpu > top radiator > tubes behind motherboard tray back in reservoir through some of rubber grommets.

Not more tubes, actually I think need far less tubes but need to change reservoir and to use only motor from D5.
Only long tube would be from top radiator in reservoir.
Loop look depend lot of compression fittings and adapters...
 

 
Or he can install D5 in dual bay reservoir.
That's even better if he move him up in line with GPU or above.
I think 100 res is enough.
I even saw some radiators with inlet and outlet on different sides, sometimes they could help lot.