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Originally Posted by Sin22
Waiting for LHG to jump in here, he's had some experience running passive rads over in Sydney, and I assure you from my time there, in summer ambients get a fair bit more than 30degC. 
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His reply in the oc aus forum
Quote:
Originally Posted by Long Haired Git
Mine: Dual parallel rads, each 130 x 150. Total frontal SA approx 39000
Yours: Single "triple" rad. Total frontal SA approx 43,200
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erm... so if all else const... the 120.3 shd perform better?
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Mine: Vertically mounted.
Yours: Horizontally
Mine: Shrouded with cardboard, fans attached.
Yours: Not shrouded.
Mine: Located in cabinet near ground level, in corner of room.
Yours: ????
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1m above ground in a corner of the room, dun get much airflow in that area tho
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Mine: AMD XP1700 @ 1433 MHz cooled by Maze 1 and Eheim 1250
Yours: Prescott??? Block???? Pump???
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its the 3.2e, have the rbx, a pair of ddc and the 120.3 ready, just need to get some tubing. Asking around to get a rough idea of wat to expect.
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Mine: Ambient plus 20°C
Yours: Better than mine, but not much. The water temp has to be hot enough to get a good delta-T going.
Keep in mind you'll need to cool the PSU, GPU, and the case in general. As per many other threads of mine, try to design a case with one slow spinning fan that has air flow to everything that needs it, including the rad. Every bit of air flow helps.
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