[Solved] RPMs to GPMs

I just setup my water cooling system and was wondering something. I have a flow meter in my loop and it's connected to my fan controller. Is there a formula or information that will tell me the equivalent between RMPs to GPM? Not sure if my pump setting is high enough. Thanks

Also, I'm noticing condensation building on my reservoir. The water level in my 250mm res is about 3/4 of the way up and the condensation is on just a portion of the non-water area. Any remedy or will it go away in time?

Add more water to fill the reservoir closer to 90% or more full. Otherwise, no, this will likely be an issue, especially when ambient is much cooler than your loop delta.

Sorry- need to address your first question. There isn't really a simple way to calculate flow meter revs into flow rate as the meter itself can be misleading depending on how much resistance it creates or how it utilizes the flow to create the meter movement. Just curious- what flow meter do you have in your loop that can be connected to a fan controller? Did the guide not come with a calculation tool (that I would assume their engineers would have created specifically for that flow meter)?

Check into this flow calculation tool from Martin of Martin's Liquid Lab (http://martinsliquidlab.org/)

Martin's Liquid Lab Pump/Radiator Optimizer Worksheet

Well, you have to consider that the water temps are going to be a tad bit warmer inside than the external side of your rad...I'm thinking that the turbulence in your res might be adding to the vaporization of the water a bit but the fan blowing directly on the res is probably cooling it enough to cause this effect.

What kind of output reading do you get from the fan controller?

So, the fan controller is reading your pump speeds as well as the RPMs of the flow meter? Just trying to visualize that.

As for flow...dual D5's should be a ton of flow, even when running at lower speeds.

I've been running a single D5 for about 6 years or so, and the single pump on setting 5 pushes excellent flow rates through my loop of CPU block, dual GPU blocks, reservoir and dual MCR320 rads. Of course, reservoirs and radiators are some of the least restrictive components in a loop, so you really should only be concerned about blocks and overly restrictive tubing bends or fittings.

Laing D5's are pretty robust- as are all their pumps. Running 2 is overkill, but overkill is just-about-right-kill when it comes to watercooling. I know that if you have the MCP655-b it runs at about speed '4' when compared to a MCP655-vario which runs at speeds '1 through 5'.

I have run mine at 5 since day one and never looked back- although yours is slower speed, but the head pressure will be greater at any given speed since you are running serial. Just make sure you change both speeds to be as 1:1 as possible so your flow rates aren't interrupted by mismatched flow.

Sorry- I don't follow you...is this a thread hijack?