Kyle:
Now that you guys have had a couple days to get excited about what Bert McComas had to say about the P4 clock throttling itself, I thought I would throw in my two cents. First off, here is the statement that is stirring the pot so well.
Intel’s Thermal Design Guide has revealed that the absolute maximum power dissipation of the 1.5GHz P4 is actually 72.9 watts. This is 33% higher than the published system design specification, and essentially identical to the 1.33 GHz Athlon. In order to prevent the CPU from exceeding 54.7 watt, thermal throttling is used. If performance critical applications drive CPU power above its artificially low 54.7 watt limit, the CPU is halted with a 50% duty cycle (alternating 2 microseconds on; 2 microseconds off) until it cools down. This effectively turns your 1.5GHz processor into a 750MHz processor – just at the moment you demand peak performance. On the other hand, you will probably still be able to check your email at 1.5GHz.
While I don't know Bert, I have had the pleasure of meeting him and you have seen his links here on the [H] many times. On this occasion I think Bert has been sucking the crack pipe a bit too hard or either must have been in a terrible auto accident and had his cranium lodged in his rectal cavity and did not notice before he wrote the above statement.
We have been running an over-volted overclocked Pentium4 with the factory heatsink installed now for some time. It has been running here beside my desk folding proteins for Stanford University now for a solid month and has stayed at 100% CPU utilization. I track its performance and I can assure you that it has not ever slipped into the throttling that Bert speaks about above. If Bert's apps are running at 50%, it is because he does not have the sense to put a heatsink on the CPU or either he is operating his P4 system in Hell. Bert is taking an Intel safety device and demonizing the P4 with it. Here is what Intel PR George Alfs had to say about Bert's statements.
Hi Kyle,
You can run benchmarks all day on a Pentium(R) 4 processor with the benchmarks unaffected by the thermal protection circuitry. The key is to have a robust heat sink and thermal solution. With the heat sink setup we designed for Pentium 4 processor systems, I have yet to see thermal protection kick in.
George.
I have to fully agree with George's statements and have a few things to add. Also, I think that "robust" need not be in his statement.
What Bert may not know is that some mainboards have an adjustment in the BIOS that you can set yourself with the temperature that you want throttle to. (On our systems we have left it at default and never messed with the settings on the particular that is Folding.) Yes, YOU can turn this on and off and fully control it on some mainboards. If you want a shield in between you and a burned up processor, set it low; if you want to forego the safety feature, set the temp high. I know that MANY of you wished that AMD had the courtesy to include a feature such as this instead of leaving their Athlon and Duron CPUs totally unprotected.
We have never seen nor heard of the CPU throttling being active on any person's CPU and certainly have not experienced it ourselves (unless we FORCED it to happen) under conditions more strenuous than 99.9% of the P4s in the field will ever encounter. I do not suggest that DIYers or hobbyist go the P4 route if they want to buy a system for themselves, but bashing it on this front is simply bad journalism and transparent to many people.
We here at the [H] have a lot of respect for Bert McComas' work and think he should step back up to the plate and possibly rephrase the statements in regards to this issue. Bert, we love you man, but you were just totally out to show Intel in a bad light this time, or were simply not thinking through the issue properly because you are being misleading and it looks to us as if you were trying to do it purposefully.
UPDATE: I have gotten a few emails that have told me that I don't understand "clock throttling". I am fully aware of what it is, how it works, and how to identify if it is being used. Just for the record.
https://www.sharkyforums.com/images/.../2005/06/5.gif My point here is not that what Burt is saying is false, but he is making it sound as if anyone that ever uses their P4 to its fullest potential will immediately be clock throttled and that is far from the case.