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Senior SMP Gawd
Jan 15, 2001
I am curious why is it all heat sinks are tested with the duron processor usually an 800 oced to 1gig.The pal got rave reviews I bought it not thinking about the processor thay used to test it,now I feel like a horses ***.

It seems so foolish to test them with anything less than an oced 1.2 or 1.33.Example my alpha pal 6035 has no ability to cool my 1.2 at any clock setting above 1.33,I set it up at 1.46 or 1.4 and the temps hit the mid 50c ranges and that heat creates stability problems.Never mind summer will bring 80 and 90 degree temps,then 1.33 may become trouble for it.

{I have it mounted properly and have artic silver 2 as the compound}Have built many a system and know it is on correctly,idle temp matches motherboard and at 1.33 she hits 48c,at 1.2 max is 45c.

By that testing process there is a lot of math work for us all and a big grey area of uncertinity.

To test them on a 1.2 at 1.4 would be a REAL SERVICE to all of us,no math to do for the 800 people or the 1.1 people as well as guys like me with 1.2 oced.Any others agree<or am i the horses *** all over again.
I get your point. Alas, the wonderful world of cooling overclocked processors is complicated. For instance, the T-Bird and Duron "section" of the non-existent Overclocker's Cooling Handbook requires more study than looking at 15 reviews of HSF "x."

If you have the luxury of time to devote to the arcania of CPU cooling, you'll develop a "feel" for the limitations of some well-known HSF's. Then you'll be able to raise your own red flag when considering your own particular CPU cooling situation. Alpha HSF's are superbly designed, and now that they aren't the most expensive cooling solution, Alpha's look better than ever.

There's a catch. There is ALWAYS a stinking catch! The PAL 6035 is in no way equal to the task of removing ~75 Watts of heat that ~1.5 Gig T-Birds produce. Even with the infamous Delta 38, the PAL 6035 can't do the job.

The Alpha PEP-66 w/Delta 38 will probably handle the 1.5 Gig T-Bird, but I bet just barely!

When you move into the zone where the world's HOTTEST x86 CPU lives, I think it's a safe bet that relatively inexpensive HSF's are useless. Money, money, money, money......Money! While T-Birds are unbelievably inexpensive high performance processors, less than expensive HSF's for them don't cut it.
I agree...but the unanswered question to me is what is an acceptable temperature for the 1.x T-Birds? My feeling is that 50C or below (under load) is sufficient. I'd love to hear other opinions. Maybe we can get a "list" of acceptable air cooling setups.
To be honest....the Durons are harder to cool due to their smaller die. The T-Birds are easier to cool because the die area is larger...which helps distribute the heat across the larger area, therefore resulting in more contact with the hsf. So testing them on Durons is not that bad....though testing it on a larger Duron would be much more pleasing.
By 'larger Duron' I mean a Duron 1giger OC'd to like 1.2. But they don't even make a Duron 1giger yet.......but Im sure its coming.

Hope this helps your confusion......
No confusion here. None of the Durons put out as much heat as a 1.2 or 1.33 T-Bird even taking into consideration the difference in die size.
Tachyon (Apr 25, 2001 08:10 p.m.):
No confusion here. None of the Durons put out as much heat as a 1.2 or 1.33 T-Bird even taking into consideration the difference in die size.

Well then I guess the guy from AMD was bullshittin' me.......you win. Besides we weren't talking about 1.2's or 1.3's. We were talking about an 800 oc'd to 1 gig. Big difference.....
Klark that duron comment started in a overclocking site,It is the answer that has been adopted by web sites and members like you.Not that you are not a great guy and member I mean no disrespect.

The truth is that a Duron is slightly smaller in die size SLIGHTLY,And it uses less energy than any 1.2 or 1.33,simply because it cannot hope to operate at the blazing speeds of it big brothers,Therefore the real cooling challange are the 1.2 and up processors and or Athlon 1gig at 1.3 or 1.5,Duron vcore 165,stock 1.2 1.75}
Just the vcore volt setting creates more heat now send that 1.33 a demanding request and,it will complete it way faster than a Duron at 1000,so if I am correct I assume that additional speed also relates to additional heat !!THE DURON CAN Not out put heat like a 1.2 at 1.4 no way no how.
a lot of sites test heatsinks quite badly. I have been putting a lot of research into reviewing coolers ready for my next lot. oc.com has the right idea, by working out the C/W of a cooler, you can PREDICT what it might be like on the 1.2 gig tbird e.t.c
The problem is, the C/W of a given HSF is not linear above a certain point. That is because regardless of the surface area of the fins or the fan speed, the contact area on the core never gets bigger.

Consider This:

Take a "swizzle stick" and a glass of water or your favorite drink. Suck softly on the stick and time how long it takes to remove the liquid. Now repeat the process and suck a little harder. Hmmm...less time. Keep going and you will hit a point where, no matter how hard you suck you can not decrease the time. That's because the hole in the stick simply can not pass more liquid any faster. It's area limits the flow volume. Now, think of that liquid as heat. With the current size of the AMD core, there is a point where all cooling methods converge. Now think of the material and thickness of your HSF base. Starting with aluminum, that represents a certain diameter "swizzle stick". Going to copper almost doubles the diameter. Going to silver adds a small improvement as well as cusil, but not as drastic as going from aluminum to copper. Even so, you will still hit a point where you can't suck any more liquid through it.

Darn, I lost my train of thought. Guess I should not have tested this process with Vodka ;D

I think you get the image, all the same.

So what you're saying is, I should replace my HSF with a swizzle stick, and suck on it as hard as I can?

Man...I think some of you O/C'ers are taking this just a little too far... :)
Maybe I'm wrong but I thought the original question was why aren't heatsinks tested with the current T-Birds to show how they perform in the 74W heat dispersal environment. With summer coming on that's going to be important.