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Performance has hidden costs - Athlon Skt A 1gHz
hyltont Mar-10-01 02:02 PM
Just purchased one of these with an Asus CV7 board. It dissipates almost 50W of heat that must squeeze through an area of about 1.5 sq cms to get to its heat sink. If the pad temp. is to be less than 60 deg C and the case air temperature to be, say, 30 deg C (max), the heatsink (incl its interface to the cpu) must perform at 0.6 deg C per Watt.
This is a BIG achievement for the available space and is CRUCIALLY dependent on fans and good thermal coupling (thermal compound must have no dirt, be very thin and even, and both metal surfaces perfectly smooth.
This performance MUST be maintained with time. Dirt on fan blades and sink fins will be a long-term problem. The ambient temperature can only be kept at 30 deg C with carefully arranged chassis fans which do not fight each other and there must be free incoming air flow to feed the extracting fans without creating a vacuum.
I wonder if the extra speed is worth all the hassle. Double the speed and quadruple the hassle.

1. RE: Performance has hidden costs - Athlon Skt A 1gHz
lbyard Mar-10-01 03:31 PM
In response to message 0
Not all of the heat goes through the pad. Larry

2. RE: Performance has hidden costs - Athlon Skt A 1gHz
hyltont Mar-10-01 04:53 PM
In response to message 1
No - but I bet over 90% does and I think the 50W is very conservative. Imagine 5 miniature soldering irons in there!

3. RE: Performance has hidden costs - Athlon Skt A 1gHz
lbyard Mar-10-01 06:12 PM
In response to message 2
Iíll agree with roughly 1/2 of a light bulb. Typical thermal power for a 1 Gig Athlon is 49 Watts; max is 54 Watts. Larry

4. RE: Performance has hidden costs - Athlon Skt A 1gHz
hyltont Mar-10-01 06:59 PM
In response to message 3
The real problem is that heat, like any other energy form, takes the line of least resistance.
When everything is newly assembled and squeaky clean, the heatsink gets the vast majority of the heat which is great.
When the fan blades and sink fins get too dirty and possibly the fan even runs slower the situation changes. The cpu runs hotter and a greater portion of the heat escapes by radiation and by conduction along its pins into the mother board.
What I don't like is being over-dependent on small, mass-produced, very fast revving fans. A large EXTERNAL sink would be MUCH safer and more consistent in the long run but it would have to be thermally coupled to the cpu by water circulation or similar so I guess we can't win.
High speed is definitely high hassle and its pros and cons should be carefully considered before upgrading.

5. RE: Performance has hidden costs - Athlon Skt A 1gHz
hyltont Mar-10-01 07:16 PM
In response to message 3
The real questions are:
What is the maximum permissable tab temperature?
What is a safe maximum limit for long life?
I don't know the answers to these.

6. RE: Performance has hidden costs - Athlon Skt A 1gHz
lbyard Mar-10-01 07:39 PM
In response to message 5
All I know is what AMD provides in the spec sheets. I have another 1 gig T-Bird to assemble next week--no, it's a 1.1 gig T-Bird; couldn't get a 1 gig chip last week. I'll take a look at the temps. Larry

7. RE: Performance has hidden costs - Athlon Skt A 1gHz
hyltont Mar-10-01 08:08 PM
In response to message 6
I will be very interested in the temps - thanks

8. RE: Performance has hidden costs - Athlon Skt A 1gHz
Vortec Mar-14-01 03:23 AM
In response to message 0
We just did an Abit Kt7 with 600 Duron oc'd to 1 gig and it runs 77 degrees F consistently. We used a Cooler Guys Wind Tunnel case with the included fans and Radio Shack paste.

9. RE: Performance has hidden costs - Athlon Skt A 1gHz
hyltont Mar-14-01 11:23 AM
In response to message 8
That is extremely cool man. It is presumably a a "slot" device with 2 fans.
Mine is "socket A" using a Chinese "Evercool" single fan cooler. This is giving a cpu temperature of 60 deg C (140 deg F). This is with the case fully open. With chassis fans should be only slightly more with the case closed.
I live in Spain and have to take what I can get. I tried to order an upmarket device from Millisec and had to give up cos they don't accept credit cards from foreigners without the guarantee of a U.S. intermediary. Delivery charges plus the intermediary's fee add a good $50 to the price.

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