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09 August 2005, 21:10
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#1 |
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Join Date: Oct 2004
Location: Ioannina/Greece
Posts: 5,040
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Blizzard PPC FSB speed....
Well, my DCE bppc has a FSB of 4x50Mhz , so the ppc runs at 200Mhz... AFAIK some people have an FSB of 3X66.6Mhz and they get a 200Mhz ppc... why? are the older phase5 bppc cards this way because they have an older ppc cpu revision? what's the deal? perhaps I too should change the oscilator to a 66.6mhz one?
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10 August 2005, 00:31
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#2 |
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Longplayer
Join Date: Jan 2005
Location: Lincoln / UK
Age: 44
Posts: 1,849
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Probably depended on the 68 cpu was attached. I may be wrong but i think the 2 crystals were always matched and never differed. The later cards had just one crystal that controlled the 68k and ppc.
in my case having the 040 which is 25mhz (50/2) a matching cystal is used for the ppc 50x3.5 in my case (175mhz) which is interesting as the cpu itself is a 165mhz (normaly 66x2.5 i guess) part so it was overclocked slightly out of the box. Having a bus speed of 50 though means lower speed to the memory and bvision in my case :/ no wonder it was the cheapest ppc card when eyetech first stocked them (£200 as i recall not inc pp) 
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10 August 2005, 07:22
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#3 |
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Join Date: Oct 2004
Location: Ioannina/Greece
Posts: 5,040
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no, the crystals don't need to match... on my bppc, there is a 50mhz one for the ppc and a 60mhz for the 060 (the 060 is a genuine 60mhz cpu, not overclocked...)
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10 August 2005, 11:24
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#4 | |
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BlizzardPPC'less
Join Date: May 2004
Location: Finland
Age: 46
Posts: 3,210
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Quote:
I have a 64mhz oscillator on my 68k part and a 66mhz on the ppc part, but my memory is not coping well enough, so i have to stick to 60ns memory setting in the ppc boootmenu. Check: http://zap.to/ppcoverclock |
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10 August 2005, 16:47
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#5 |
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Join Date: Oct 2004
Location: Ioannina/Greece
Posts: 5,040
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hmm... perhaps a ppc overclock will e usefull if os4 gets released for it...
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10 August 2005, 22:16
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#6 | |
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BlizzardPPC'less
Join Date: May 2004
Location: Finland
Age: 46
Posts: 3,210
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Quote:
 , you DEFINITELY need to overclock your ppc right away! (and not for the OS4 alone) . There IS a speed difference when comparing a 200mhz ppc to a 264mhz one you can imagine..... 
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11 August 2005, 07:25
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#7 |
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Join Date: Oct 2004
Location: Ioannina/Greece
Posts: 5,040
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no, I was just curious about the fsb's... why older cards may have a 66mhz one and my "newer" has a 50mhz one... right now what the ppc does for me is to decode mp3 streams
 though I certainly would not mind making it faster if there are no probs
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