Dual pumps noise

[Scaniris]

Clamps? You need clamps. Test setup? You need clamps anyway

Well I see another reason from upgrading the stock top with an aftermarket one: fittings! Pluging a 7/16'' ID tube on a stock D5 top is REALLY difficult, need some hot water, time and energy to succeed. With a top (single or dual) you can choose the fitting size and kind depending on your tubing.

Concerning the performance ratio .... IMO 2x Single top or 2x D5 connected together are as good as 2x D5 in a dual top. I made comparisons between 1x D5 with stock top, 2x D5 serial with stock top, and 2x D5 serial with a dual top:

Photos of the test setup: http://www.xtremesystems.org/forums/...=239883&page=6 with a clamp less tubing disaster
Results: http://www.xtremesystems.org/forums/...&postcount=103

Finally the benefit of the dual top is the ''all in one'' format with reservoir. But today I have 2x X Top Rev 2 instead of the Dual Top. 2 loops ok but if I go back to a single loop, I'll use 2x single top and not anymore the dual top because it's easier to swap a pump in case of failure with separate pumps. And because I didn't noticed any real benefit of the Dual top performance wise. Ok the test setup was not including waterblocks, but in real operation mode... theres no difference at all, some % but not a big deal.