So I am building my own custom computer desk and gathering all the parts and pieces I need prior to disassembling my current rig. Just curious if anyone has any ideas on a good loop direction, does this one work? does anyone have any other ideas of loop thoughts? Top left item is EK's new Flat Res/Pump Combo that I ordered, and then Rads on the sides.
 
Edit: All the parts are being laid flat in my computer desk that I am building. Pic below is the new EK Res/pump combo i was talking about. The runs aren't going to be that long from what i measured. It just looks like its a long haul. I have more than that tucked away in my tower running behind everything than I'll have just going straight shot from part to part. The Blue and Red lines are already setup to run into the blocks at the proper port for flow. Nothing is going reverse flow compared to the fin plates inside. The setup is similar to what I currently run, i have my GPU/CPU in a parallel setup meaning, they both get a little bit of cold water on the left ports into the block. Meaning, Left port GPU then left port CPU, then hot water leaves on the right port cpu and right side gpu back to the Res. I am just adding a Rad in the sequence to increase overhead in the future for cooling while also reducing fan noise since I wont have to run 3 fans at 1k rpm, i can run 6 at 500 and have the same cooling properties but half the noise. I am adding a drain port or valve to the back side of the Res once it's mounted inside the case. The bottom of the new Res has 2 extra holes drilled beside of the pump. The regular Volume series just has the 4 holes drilled in the front plate. The drain hole or the 2 extra holes are inline with the other adjacent holes on the front giving me more or less the "lowest" point in the loop order to be able to drain it easily
 

 
 

make sure the (reservoir) "pump" is gravity fed
 
keep hoses short
 
Remember air rises -- when your trying to get the air out of the loop.  Hey, tipping a PC case is easy compared to trying to tip a Desk
 
Quick disconnects can be handy
 
drain

No, the second rad is fine if that is where you want to put it
 
Many nice short water loop information in these:
1) EK Guides
2) EK Blog
 
 
& this Thread:  Ready to try water cooling. Where to start? Library of links-basics to expert

It's all going to be on the same plain since it'll be in a desk. My concerns were there tubing flow, like the way the water is routed. Flow shouldn't be affected splitting up the flow half to gpu and the rest going to the back rad then CPU then back to the other side

It's hard to describe in text as far as the splitting goes like I'm trying to describe.
This is how my flow is routed currently
 
Idk how i can post images after the first post, this forum is ridiculous

Sorry but that's a horrible idea to split the flow and run it like that.  The fluid will find its way as stated to the least resistant part of the loop.  You would need a perfectly flowing loop but there's no such thing as perfect.  The fluid will always flow more on one side than the other.  It's always best to run the loop short and simple with the pumps in serial if more than one are added and the selection of Serial or Parallel on multi GPUs.  I've run both and had no issues but if you want the same temps all around than Parallel is the right configuration for GPUs.  Again, flow is never to be split up unless its going through GPU blocks at the most and met up at the end but hey, to each their own.

HayzBaby
It's hard to describe in text as far as the splitting goes like I'm trying to describe.
This is how my flow is routed currently
 
Idk how i can post images after the first post, this forum is ridiculous

 
I clicked on your Imgur image ---> Then selected "Copy image location"
 
Steps can be found in the:    Ultimate Self-Starter Thread For New Members

           9. How to Upload and Post a Picture
 
 

EK's new Flat Res/Pump Combo -- pump out bottom of desk --> put pump at lowest point --> shows the Res facing up - Horizontal (check EK documents for approved mounting orientation)
 
- Or even vertical, outside of the desk on a bracket
 
If that Res has unused port that may be a good place for drain out the bottom of desk
 
Those two radiators --> face the sides of desk ---> intake air through side of desk - then radiator --> "out" back or bottom of desk
 
 
Check the Mods Rigs section search - see what others have done
 
"Search by - Case" & "Key term" - Desk = 19 systems - not all had photos

Make sure to include a drain port. It's vital to the maintenance of the loop.
https://www.ekwb.com/blog/useful-tips-part-1-drain-valve/
 
Install it the way it makes sense to you, just make sure you have enough tubing to get the job done. It's as simple as making sure your loop goes full circle back to the pump.