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Author Topic: Extreme Amiga overclocking.  (Read 19758 times)

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Offline Ilwrath

Re: Extreme Amiga overclocking.
« on: July 16, 2004, 03:56:41 AM »
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But has anyone tried over-clocking the MoBo on any Amiga?
Not just the processor, but the whole MoBo.

Essentially, that would be overclocking the chipset, and AFAIK, the custom chipset doesn't like to be overclocked by more than few percent past default NTSC.  (May also mess with video output, come to think of it?)
 

Offline Ilwrath

Re: Extreme Amiga overclocking.
« Reply #1 on: July 16, 2004, 05:37:27 AM »
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You should be able to overclock the chipset somewhat... As I recall that's what a genlock does to sync up the video output. Isn't that why CPU clock frequency is seperate from the chipset in the first place?


I'm not sure if an Amiga genlock adjusts the Amiga's video timing, or adjusts the timing of the video after it leaves the Amiga.  I always assumed it was the later, but perhaps I'm mistaken.

Anyhow, to run a CPU faster than 7mhz, the CPU frequency is seperated from the chipset/video/motherboard frequency.

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Hmmm... if thats the case, wouldn't a Multi-Sync monitor solve that problem ??


I don't think so...  Not unless you also have a set of new screenmode definition files (like the NTSC/PAL/DblPAL/Super72 files) that take into account the new pixel clock.  

Otherwise I suspect you might get sync, but the display would probably still be garbled and framed wrong.  
 

Offline Ilwrath

Re: Extreme Amiga overclocking.
« Reply #2 on: July 19, 2004, 04:10:32 PM »
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Overclocking is generally understood by all to be a bad thing for the CPU and Motherboard (and it may even add to global warming)


May? MAY?  Environment be-damned, I conducted my own, more controlled Athlon overclocking experiments a while back...  During which time, a large block of ice broke from the polar ice-caps.  Coincidence?  I think not.

I started with a lowly 10% overclock, and my box started putting out more BTUs than my furnace.  I was happy, though, because I found myself saving big on my winter heating bill.  However, encoding DivX required me to open the windows of my apartment to avoid heat-stroke, even on sub-0 freezing winter nights.  Kids couldn't build snowmen for blocks because everything thawed and trees started growing new leaves in December.

But, I figured that was safe enough, so I wanted to push things further.  I raised the core voltage a few points and boosted it up above a 20% overclock.  I found out I could cure pottery and sterilize medical equipment, simply by putting it inside my apartment!  Now I was saving on my water bill, as well.  Dirty dishes?  Here, we can autoclave them clean!

Of course, due to the heat, I couldn't get close enough to the machine to try pushing it further.  My next set of experiments involved cooling the thing with dry ice and pushing the core voltage up to 1.21 jigawatts.  In hindsight, I suspect this configuration might also cause problems in space/time and perhaps even bad sequels, as well.  It may be best that this series of experiments were never carried out.  ;-)  

These Athlons are clearly dangerous.  We should start a class-action lawsuit before someone goes and destroys the universe, or something.   :lol: