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On to 504
Now that I had an idea of what kind of heat was produced at 464 MHz, it was time to push the Celeron to 504.   I started at 2.3 volts and worked my way up to 2.6 volts.  On 6 different tries, I was unable to get through the test at 2.3 volts.  At 2.4 volts, the tests ran much better, but I still experienced an occasional lock-up while rebooting into windows.  At 2.5, the system was even more stable, but the temperature was beginning to get into a range where pushing the processor hard - i.e. gaming, etc. - was going to produce some pretty high temps.  At 2.6, things seemed to be about the same as with 2.5 volts, except for the temperatures, which were now beginning to shoot upward when the processor became active and Rain's HLT command was not engaged.  Because I saw no more stability at 2.6 than I did at 2.5, there was no reason to try 2.7 volts. 
 
Celeron 300A @ 504 MHz - Temperature at Voltage - CPUmark32
Voltage
2.3
2.4
2.5
2.6
Room Temp
64.8°
64.8°
64.8°
64.9°
Start Temp F
68.8° 
68.9° 
69.7°
70.9°
End Temp F
Failed test
89.7°
 91.9° 
 94.1° 

 
WinBench99 Comparison of 464 to 504 MHz
Test - Win98
Win98 - 464 MHz 2.1 volts
Win98 - 504 MHz 2.5 volts
WinBench 99 . .
CPUmark 32 957 1040
FPU 2440 2660
Business Disk 98 2320 2440
High-End Disk 98 6950 7150
CPU Utilization 5.57% 4.87%
Avg Seek (ms) 12.3 12.3
Transfer - Beginning 11100 KB per sec 11100 KB per sec
Transfer - End 10800 KB per sec 10800 KB per sec
Win98 Build 1998 1998

Stability at 504
At 464 MHz and 2.1 volts, this system is rock solid. Win95, 98, NT4, and 5 run with no unusual problems and the few lock-ups I have experienced I attribute to software, rather than hardware problems.  Unfortunately, even at 2.5 or 2.6 volts the same can't be said for my Celeron at 504.  I have been running at 504 on and off for a couple of weeks now and while the lock-ups are not that often, they are there in greater numbers than I feel is acceptable.  At this point I can't justify the added speed if it means that I must give up stability.

Peltiers?
One thing I have noticed is that with 2.5 and 2.6 volts, there is a large difference between the temperature of the slug and that of the heat sink when starting any CPU intensive operation.  The CPU is heating up very quickly with the high voltage.  At 2.1 through 2.3 volts, the processor gains heat slowly enough that the heat sink is able to absorb it as it is produced.  This has me thinking that the circuitry inside the slug is running much hotter than the temps I am observing by measuring the slug's temperature.  This, in turn, has me thinking  that it may be possible to coax a little more stability out of the celery at 504 with some active cooling.  Yep,  you guessed it, I'm thinking about peltiers again.

I have placed an order for a couple of peltier elements and have rounded up all of the hardware necessary to assemble them into a heat sink or two to test.  Unfortunately my understanding of "two day air freight" and that of Mecci Surplus seem to be different, and I am still waiting for the TEC's to arrive.  Soon, I hope.
 

The Peltier Sandwich =>

page 1
Intro
.
page 2
voltage
limits
page 3
high
volts
page 4
trying
peltiers
page 5
second
attempt
page 6
stable
@ 504
page 7
lower
voltage
page 8
case
heat
page 9
final
thoughts
page 10
build
it