Bindusar

Here, let's try this...if you already have the pumps and want to use them you can so it helps. If not, stick with just the L30 and don't worry about it.

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Towlieee

not nocessarily.. Depends on how much resistance he has..

If he has a very high resistance, and his current single pump rated at oh say, 300gph, can only pump 30gph.. If he doubles pumps, maybe he'l get a extra 15gph, possibly up to 30gph extra..

I think the Y idea would be REALLY bad, since unless he uses the EXACT same blocks on his CPU and GPU, then one of the blocks would get more flow..
Not to mention, if you did decide to use the Y idea, you'd wanna use like 5/8" hose Ying into 1/2" hoses or somthing, that way you can keep the flow up..

I'd say FIRST check your water temps.. I monitor my temps, and with my homemade radiator I had 10f above room temp water temps...
So I built a bong, now I get room temp water.. There is NO use in me using a radiator, or adding anything to mysetup, unless I remove the bong...
Same thing with yours, if your getting room temp water, or 1-2f above room temp, dont worry about a second rad.

If your water temps are higher, i'd suggest buying the 77 boneville radiator, possibly upgrading pumps..

Do a test and see how much water you flow.. Get a 5 gallon bucket or somthing ,adn time how long it takes to fill that bucket, and see how many GPM or GPH your getting.. Then you can decide if you need a new pump..

Personally I use a chitty Via Aqua 1300 pump.. I was thinking of ways to upgrade without just scraping this pump, at first I thought, i'l just buy a second and use it inline..
Now however im thinking of buying a really nice pump and use it ONLY on the CPU and GPU
then use the via aqua 1300 on a second loop for the chipset, video card ram, hard drive, and possibly ram.

My $0.02