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| Thread ID: 50784 | 2004-11-01 10:50:00 | Fans: Blast air on to CPU? Or suck it away from CPU? | george12 (7) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 286829 | 2004-11-03 01:08:00 | I played with some numbers last night and decided that CPU cooling is a subject which probably needs some proper design . :D Temp-rise (°C) = (273+inputair temp) (°C) x Watts of dissipation/(168x airflow (cubic ft/min) (This is from a book on transmitter design . Since multi kW output valves cost many thousands, the cooling design is conservative ;-)) . Plugging in 35W, 15 cfm, and 20°C input gives about 4°C rise in temp . :O People seem to think that 50-60 ° (so 30-40° rise) is OK . I'm not sure what these modern CPUs pull; I remember the Alpha was 35W, and 15 cfm for 50mm fans in the Jaycar catalogue . So there's some "not very good" heat exchanging going on . |
Graham L (2) | ||
| 286830 | 2004-11-03 01:23:00 | "Pentium 4 D0 stepping chips have a Thermal Design Power rating of 84 watts up to 3.2GHz, and 115 watts for CPUs up to 3.6GHz. " - Overclockers.com Where as a Athlon FX55 come in at around 104W |
Pete O'Neil (250) | ||
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