If I were doing two CPU's i would get one pump: Eheim 1260 or 1060, Two heatercores, and 2 waterblocks and a res.
Run from res, to pump, split flow between two rads, then go serial to the water blocks, then back to the res. The water temp will only be like 2 deg celcius warmer in the second block and the dual rads will cool no problem.
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Water Cooled Inwin Q500 (Dual Rads: Rad1 = DTEK Pro Core | Rad2 = Blick Ice Estreme, Hydor L30, Dangerden Maze2, Bay Res Typhoon Reservoir, 1/2 " DD Tygon Thick Wall Hose).
Flow: Res, Pump, CPU watervlock, Y into both rads, both rads into res independently.
Athlon XP 1800+ (@ 1731 - 150mhz fsb.), on a Asus A7N266-c, and a Radeon 9000 *waiting for RMA'd Saphire 9800 ultra from Newegg)
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