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To: Petz who wrote (68721)	1/23/2002 9:28:13 PM
From: fyodor_	Read Replies (1) \| Respond to of 275872

Petz: how well are NW 2.0 and 2.2's overclocking with very good air cooling? Now that is probably a useful metric. Historically, it's been quite good, at least ;-). So how well does Northwood overclock? shrug I haven't seen anyone really do much yet and wouldn't expect a statistically interesting number of results until very late this Q. I would expect that 100 MHz below that whould be readily achievable within 3 months. It's perfectly possible that Intel wouldn't want to push Northwood just yet. They still have to sell the .18µm P4s and AMD isn't exactly poised to overtake them&#133 so why rush it? -fyo

To: Petz who wrote (68721)	1/23/2002 10:13:40 PM
From: Joe NYC	Read Replies (2) \| Respond to of 275872

Here is the report of the 3 stooges at Toms Hardware: www6.tomshardware.com They did something, as far as what they did is not clear to me, but they have a bunch of benchmarks of P4 running at 3 GHz. Let me know if you understand what they did: But still, finding out the true physical limits of the top CPUs is something that continues to concern us. After all, a clock speed of 2200 MHz should not be any sort of a problem for a 0.13 micron design. So, we pulled an all-nighter and hot off the presses here is our take on breaking the 3GHz barrier for the P4. If you want to apply standard air cooling only, you need a specially selected Pentium 4 processor that Intel itself was unable to provide for us. If you possess a water cooling system you can use almost any P4 Northwood at 2.2 GHz or higher. Our thanks go to a large PC vendor, who was able to give us a hand-picked processor that is particularly suited to air-cooled overclocking. The fact is, the majority of existing, available Pentium 4/2200 CPUs with the Northwood core do not run stably at the extreme clock speeds higher than 3000 MHz, no matter what tricks you use. In any case, going over 3GHz cannot be achieved with traditional CPU coolers based on a heatsink and fan. However, the picture changes completely when you use a high-performance water cooling system, or even a hermetic sub-zero cooling system with an evaporator. Only then can the temperature of the CPU die be kept under 20 degrees Celsius. They say that a handpicked CPU can do 3 GHz with air cooling, but they don't use it (or are they). Later on they say that any CPU can do it at 20C, but they are cooling it with water at freezing point - 0C. I don't know if they are measuring the die temperature while testing, or it is just their guess, but it seems to me that if the water is at 0C, the CPU would run a bit cooler than 20C. With the credibility of the 3 stooges (Frank Völkel, Uwe Scheffel, Bert Töpelt) it is not out of the question that they did not use the handpicked CPU and cooling with icy water. They run this .13u CPU at 1.85V Joe