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# Help Me Understand Flow thru SLI Bridges: Series vs. Parallel - Page 2

Quote:
Originally Posted by Auxillary Field

The difference is that running parallel is kind of a waste, while running series is fine. As GingerJohn said the water temperature difference between blocks will be quite small unless you're pushing a very low flowrate through the setup. In parallel on the other hand the flow rate through each block will essentially be divided by half (in the picture from the OP with 2 blocks), so maintaining the 1 GPM 'minimum' is going to be a lot harder. Furthermore if you have 3 or more cards connected in this fashion the flow will bypass the blocks in the middle, as there is no reason for the water to flow through the fins.

That makes no sense at all . . . .

Given any number of identical blocks in parallel, you'll find the flow divides so evenly between them that you'd be hard pressed to measure the relative differences.

The biggest issue with paralleled blocks is bleeding the air out, as they do offer more entrapment scenarios, and to a lesser extent, until you exceed 3 blocks when it gets really touchy, having enough pump power to manage an overall flow rate near to or exceeding 2gpm, and preferably more like 2.5.

Darlene
Quote:
Originally Posted by IT Diva

That makes no sense at all . . . .

Given any number of identical blocks in parallel, you'll find the flow divides so evenly between them that you'd be hard pressed to measure the relative differences.

Yeah "bypassing" is a bit of an exaggeration I guess: in my defence I was almost asleep when I wrote that post. : D However what I probably meant was that the flow will not be forced through the middle block(s) in the same way it will be throught the first and last one. But the influence of this effect could very well be negligible if the flow rate is as low as it is in a typical WC loop.
Edited by Auxillary Field - 6/20/13 at 11:05pm
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