Passing 5/8 OD Tube Through PCI Slot - Bracket?

Hi, I am just starting to plan my first ever water cooling loop.
I am planning on using MasterKleer 7/16" ID , 5/8" OD tubing.

I need to pass it through my PCI port to reach an external radiator.

If I was to use something like this with 1/2" barbs on each side:

http://www.specialtech.co.uk/spshop/customer/Pass_Through_PCI_Plate_with_1_4_Threads_p_7366.html
or
http://www.chilledpc.co.uk/shop/product_info.php?products_id=903




Would it severely restrict the flow in my system?

As in would it would make more than just a couple of degree's difference in temps. I am not doing any extreme overclocking or anything, so not really bothered if my temps are slightly higher. The convenience and neatness of this PCI bracket is more important to me than a few degrees, but if it is going to make a big difference in temps then I'm going to have to drill some holes in my case to pass the tubing through, which I really want to avoid doing.

I have read that 5/8 OD tubing can just about pass through an empty PCI port with a bit of a squeeze (link), so my thinking is that this PCI bracket would only have a marginally smaller internal diameter than an empty pci port so wouldn't affect the flow too much? But I'm only just starting to research water cooling so could be completely wrong

Thanks!

i dont think it would make a huge difference, waterblocks force the water through much smaller spaces, and that isnt a huge difference in diameter.

Thanks for the response what really annoys me about the design of this bracket is that the 2 pass through connectors are right next to each other, forcing me to use barbs because compression fittings will probably not fit

Does anybody know of any pci pass-through brackets that have the pass through holes further apart from each other, so you can fir compression fittings on them?

I just came across the Bitspower Dual PCI Bracket:
http://www.overclockers.co.uk/showproduct.php?prodid=WC-014-BP&groupid=595&catid=667&subcat=
Which would allow me to pass the 5/8 OD tubing straight through easily. But it requires you to cut out the metal between 2 adjacent pci ports, which isn't too bad but would prefer not to do!

Use the Koolance quick disconnects integrated on the brackets. Not sure what they're called.

Tsumi, I have actually been having a look at the quick disconnects over the past few days, I assume you mean this pci bracket:
http://www.koolance.com/water-cooling/product_info.php?product_id=2036


I couldn't find this quick disconnect bracket anywhere in England! I can find the normal male and female connectors, but not this pci bracket. I can order direct from Koolance's website to ship them to UK, but it worked out so expensive it isn't worth it.

The Koolance PCI bracket would actually be more restrictive than the bracket in my first post. Because they look exactly the same size, but the koolance QD would have the internal valves etc that would decrease the flow more.

I am planning to just use a normal male and female quick disconnect connectors in the middle of the lowest tube in my system, so I can easily drain it