j.c.f.'s Athlon Overclock Phase
II
So having the cache strapped to 1/3 means I can POST
and successfully boot at 800Mhz and run for as long as I care to without any system
glitches, and having the TECs in there pumping their little hearts out means I can have it
all year round. However I can't touch 850, not at any voltage up to and including 1.8V and
I'm not game enough to risk my fantastically fast machine just to eek another frame per
second out of it, and I do mean frame. For instance Unreal Tournament on a TNT1 at 800x600
goes from 51.0 fps @750 MHz to 51.9 at 800, no big difference. Even
using the TNT2 at work the bench is the same so we're into diminishing returns territory.
Another result, this time from changing the heatsinks
is the increased effect that high and low fan speeds have on the temperature of the cold
plate. Using plain convention and the old MECI heatsink there is only a few degrees
difference between having the 24 ohm resistor in series with the fan or bypassed, with the
new heatsinks there's a 15 degree difference! Might've been more, I
panicked and threw the switch when I glanced up and saw the thermometer over 100 degrees
when it had been at 85. Guess I put up with the increased fan noise.
Is there anything more to do? To go at a higher clock
speed will mean running the CPU below room temperature (unless I'm missing something
here). I will need to use the 70W TECs I have from Plycon (bought just in case
again), I'd have to build a linear supply to drive 'em (which I might do anyway, that
could be fun, one less fan in the case at any rate), those puppies are sinking 6A a piece
and these ATX supplies are typically only good for 8A on the 12V rail, then I'd have to
fully insulate the CPU with all of the structural details involved there. And to cap it
all off I'd probably need a water cooled system to dump the 200W or more of waste heat, I
think phase III will be waiting for a while...
Should you really want to communicate you can eMail to:
jforster@u.arizona.edu
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