Single loop two res/pump combo's

[Martini1991]

Hey there. I'm fairly new to Watercooling, so bear with me.

Usually I run two independant loops. A CPU loop consisting of my EK Supreme HF, my 120.1 Thermochill RAD and then my XSPC 750lph res/pump combo.
A GPU loop consisting of my two EK 6870 full blocks, 120.2 thermochill RAD and then another XSPC 750 lph res/pump combo.

However, recently I went from an AMD CH4 + 1055T to a 2500k MSI GD65 and again used my two seperate loop, 2 weeks in my board died and I've jumped back to AMD using a CH4 and 1055T again.

Now it's time to put the build back together, however it'd work so much better just use it as a single loop going ;

Res/Pump1 -> CPU -> 120.1 -> Res/Pump2 -> GPU1 -> GPU2 -> 120.2.

Would that work?

Here's the res pump combination ; http://www.overclockers.co.uk/showproduct.php?prodid=WC-011-XS&groupid=962&catid=1845&subcat=
Mine are the rev 2 ones.

Secondly, the way I'm going to do GPU1 -> GPU2 is ;

.In...Out.
.BLOCK1.
.ln...Out.
.BLOCK2.

Block 1 would feed into block 2, and then the water coming out of block two would go out into block 1.
Block 2 would have two of the "stoppers" on, would that work fine? It keeps it simple tubing wise.

Cheers.

 

[Martini1991]

Personally, I would dump the second pump.

Not sure what you mean by your GPUs, do you mean you'll have them in parallel? Doesn't make any real difference, again personally, I would just put them in series.

As would I, but I don't think that one of those XSPC res/pump combo 750 lph is good enough to do a loop consisting of 3 blocks and 2 rad's. Flow rate would be fine, but it's the delivery head that's lacking.

And yes I mean parallel for the GPU's. It's because I'm going to have my 120.2 bottom mounted in my HAF 932 (I can't rear mount my 120.1 and top mount my 120.2 as they're too big to fit together)

So with it going parallel it makes it a lot easier.

 

[Martini1991]

Here's a picture of how I mean with the GPU's they feed in/out of each other (Not my pic, just a google)

And it's the built in one as per link.
I had a quick look around, but I haven't a clue what pump is inside it.
EDIT : For reference, the delivery head is 1.8m.

 

[Martini1991]

Pump in pic might be a MCP655, can't say for sure.

Your hardware doesn't require separate loops. A single loop config with a quality fat 360 rad and an 18w DDC or a D5 will suffice surely?

Personally I'd put your existing rads and pump/res combo on ebay and get the above.

Parallel or series will make little difference, but as said put them in series. I can't see how a series config makes tubing more complex.

I don't really want to mess around with changing my loops lol.
I have one fat 120.1 and one fat 120.2, it works for me

He won't be able to tube it up in series if that picture is of a similar set up as there's no space.

I think you're pump would actually be ok, might be worth getting the loop calc spreadsheet that Skinee does I think?

Yeah, that's kind of my reason for the parallel, it's slightly like the picture.
The head delivery is only 1.8m on these pumps.

 

[Martini1991]

Here's a rough picture of my GPU's in parallel, this will work right? ;

 

[Martini1991]

forgive my WC inexperience but in the pic above isn't the water simply going to go straight through the block and carry on to the second gpu as it'd be the path of least resistance and vice versa when it heads back to gpu 1. The water has to go all the way through GPU 2 as it has no choice, but GPU 1 I feel will get very little water going through the block itself.
I could be totally wrong as the block may simply not work like that.

I'm running them in parallel due to my 120.2 RAD being bottom mounted.

The blocks are of equal restriction, the only difference is the additional tubing to the 2nd GPU so water will flow fairly equally through both blocks. It's essentially like putting 2 resistors in parallel in an electrical circuit, the current splits in two and goes through both resistors.

An interesting side effect of doing them in parallel is that the overall pressure drop for your GPUs will be about half of a single block and about a 1/4 if you had them in series.

Flow rate should be ok even in parallel?
So, I'm assuming the way I've got it set out is perfectly fine then?

 

[Martini1991]

That parallel pic looks really wrong. I've never tried it but that looks as though the first card block has the inlet and the outlet to the second block directly in line. There is nothing to cause half the water to split and go inside the first block. It appears as if the water will almost all flow through to the second one and then out. I suppose it depends on the internals at the top of the block but all the gpu blocks I've seen would not work as per your pic.

That is what common sense would dictate, however in theory and in practice it works as pointed out on the post above me.

 

[Martini1991]

I seriously doubt that. Water takes the path of least resistance and behaves very like electricity. I see no reason for the water to travel around the first block and suspect that the flow will not be sufficient to cool the first one.

I wait with interest for the actual load temperatures once built.

You're going to be a little disappointed, one of the sensors on my cards is knacked anyways and sticks on select numbers.

I can give you the temperatures of one of them lol.