As far as the water drying up... well with a sealed system it will take a hell of a long time to seep through the components. and most of us have res' that we can see in one form or another and we will notice just a little tiny bit of water loss. which is long long long before there are any issues. Unless the tiny bit of water loss is from a bonified leak.... then ur fuxxored... though i have been lucky with leaks.... my geforece 2 has been soaked 3 times... it runs great till this day..

not so at all
as heat 'moves' from hot to cold, so liquid will 'move' from high saturation to low
- by means of the permeability of the hoses and joints

why do vinyl hoses collapse in sealed systems ?

BillA, if I'm not mistaken, from the data you've provided me with, I would conclude that going with a quieter less powerful 1048 sinstead of an mcp 600/650 I would loose only around .02 degrees C.
That is if my loop consisted of an 80mm rad, fill bleedkit, and an mcw6000.
Correct or not (please tell me) how much would flow decrease if I were to add an mcw50 and use a black ice pro II instead? Even if you could just point me to where I can find out, I'd be very appreciative. Thanks!

edit: 0.2C not 0.02C

I do not comment on products not sold by Swiftech
sorry
I know of no (public) flow data on the BI Pro II

I can accept that, how about a single bi pro?
I would imagine thats close enough to what I'm looking for anyways. This interest in information shouldn't be soley to satisfy my own watercooling needs.
Just curious of the effects of an additional block and more reasonable rad.
Cause in relation to my previous post, would a person looking for a quiet pump with good performance need to look no further than the 1048...considering is performance drop in comparison to the mcp600 variety is nill.

bump...just incase anyone has anything they could add.
very curious of the effectiveness of a a quiet ehiem pump in a realistic loop...with the swiffy block of course.

Is it normal for a 650 to make a high pitch noise ? i just added a 2nd thermochill 120.2 so i can run silent fans and the noise of the mcp 650 i added is worse than the noise of the 2 fans before.

the 4k spike, a (lamentably) known feature

EDIT
wrt the MCP650

I'm using a BI Pro 3 and an AquaXtreme pump in my main system and while it has a low hum it's not loud at all. I don't see any way it's 40 dB

derek, he is talking about the mcp650.

Bill: Is it when the 650 gets up to high rpm, or the low rpm when under heavy load that it starts to whine. I have had ppl reporting to me that it is very noisy over at XS. It seems the mcp600 is much better in this respect.

and . . . . . ?
mercy, read the threads here and on OCAU
Cathar goes into this in great detail

oy...

I wasnt asking for great detail bill. I was just curious as to wheter it was high load or low load. I personally dont much care as I will never use the pump, but its good info to have.

Sorry I should have clarified. I was responding to the comments about the MCP600 being loud; I don't find it to be a noisy pump at all. I haven't put the MCP650 into service (but I used one of the old louder D4s for a while) so I can't really comment.

Does the resistance where it begins to have a high pitched whine coincide with that where the MCP350 becomes a better choice anyway?

no, the noise is pretty much constant until very low voltage
and
just as pH described - in fact sooner

pH, looking at pq curves you must notice that the DDC would not be good for blocks like the TDX for instance that love flow. Its great for blocks like the mcw600 and 6002 but they perform much better

But two DDC's in parallel it would be a good (albiet expensive) choice.

As to the mcp600. Everyone I know that has boughten one over at XS loves them for their performance and for how quiet they are.

I've set up a few systems with a number of different Swiftech blocks, emphasis has been on quiet. If you are cooling only a CPU, don't care about overclocking (to temps just under max allowable are OK) then you'll be fine with a 6000, 1046, 3/8" tubing and a BIP.
If you'd like better performance, swap out the BIP for a BIP2 or a 6"x6" heater core with shroud.
Better than that, go with a 1048 or a HPPS (12V variant of the 1046, quieter than the 1046, seems to pump 1046 volumes at 0 head but is more like the 1048 at higher resistance).
All of this assumes that you're running very quiet fans, with airflows to match.

Also remember that you have to be careful to avoid water flow resistance (no right angles if you can avoid it, for instance) and air flow resistance (rounded cables, wires tied out of air path, non-restrictive grilles, etc.).

I've tried swapping 3/8" ID tubing for 1/2" ID (same system, wb left in place to avoid possible variation from a re-mount) and have seen, well... no temp improvement (using the crude measuring stick of MBM). Given that 1/2" tubing is going to have a larger OD, and so cause more airflow disruption, maybe 3/8" is better for low-noise. I've no way to measure this accurately, so please just regard this as "thinking out loud".