Ek pump/res combo or

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So i started buying my loop stuff today. Im torn between doing a pump/res combo or a seperate pump and reservoir setup. I purchased the EK Coolstream PE 360 and some primoflex tubing kit but i stopped there. Im torn on what to do about a reservoir and pump. I want really good flow because i might be adding 2 gpu's into the loop later on when i do my next gpu upgrade. I was looking at the https://www.ekwb.com/shop/ek-xres-140-revo-d5-pwm-incl-pump combo but thought well what if that pump isn't enough? Will this fit into my corsair air 540d case......etc. I will also be adding in a 240 rad as well when i do my gpu addition but for now i just want to get up and going. So pump/res combo or seperate? What pump is the right pump?
 
Solution
there are a lot of metals in the loop. rad tubes, fittings, blocks, even something in the pump.
Nickel is neutral, that's why a lot of blocks are nickel plated.
Swifttech mcp655 seems to have great reviews on it. Next a pump top and res. I believe a smaller res will be more ideal in the event I have to stash it on the other side of the 540 case by the power supply. The classified cards I have are rather large so I'm iffy if there will be enough space for the res.
 
Again, it is exactly the same D5 pump :)
The problem with mcp655, is that it does not come with G1/4". You have no way to connect fittings. So you will need again all those different tops to suit your need.
Regarding the res. a larger res will allow more convenient refilling. small ones hold very little amount of liquid. so you fill it, turn the pump on for a few seconds, and than turn the pump off to fill the liquid again. the worst thing is to run the pump without liquid in it. so with smaller res, it takes 4-5 times to start-stop the pump before you can constantly run the pump and add small amounts of liquid as air is removed from loop.
Important thing is to think in advance about draining and refiling the loop in advance. I have a tap at the lowest point of the loop for draining.
 
I just won't have any place to put a larger res so I'm kinda stuck with a small res which is meh whatever. The reason I mention the swifftech is my local store has it and it's the exact same price as the standalone d5 vario at $79.99. So figured I won't use its housing just the pump then get the correct housing I need.
 
nickel is bit better for corrosion prevention.
Kinda more safe with you have a lot of components in your system. mixing different metals can lead to problems.
there could be better choices. check the reviews. I think Koolance have one of the best, but i might be wrong.