Problem designing water cooling system

no you need a min of a 240 rad for just 1 cpu or gfx card, conumdrum has a stickie at the top of the threads he's the WC pro here

Two 4870's need a 120x2 rad at minimum and higher speed (louder) fans to cope. An i5 needs a 120x2 to function.

So no way, unless they let the CPU and GPU temps get stoopid and use higher speed fans.

Watercooling is a hobby, and isn't something you should ever prebuy in a prepurchased system.

No way

Thats good stuff they use, just a little small.

air cooled hd4870's get very hot i know i have 2 and they require my fans speeds set to 50% or they crash in game , although i have more heat generated in my case than the average user.

i got 1 with a ref cooler which is the worst and the other is similar to the vapourx design and they both overheat tbh but the stock one is louder to achieve the same temps

doesn't help with a vapochill letting alot of hot air up through the hole at the bottom which goes directly to my gfx cards

Ok I just found another strange product:

The sapphire 4870x2 atomic manages to squeeze two RV770s and a CPU block into one 120mm Rad!
GPUs get to 54 degrees under load, CPU at 48 degrees idle.
Thats pretty impressive for a single 120 I think!

Impressive for a 120 rad to cool both. Good temps? Nope.

You mean a 4870x2. Not some arcane chip name. It's a 4870x2.

Hmm no metion of ambient temps or what it was installed in/on. I can pretty much bet it wasn't inside of a case.

So the test has very little validation, usually expected and written into a review. Actually, reviews isn't where we find out best data, it's tests done with consistent scientific methods, like here.
http://www.skinneelabs.com/
Science at work.