Very interesting - I'll go and have a look at xrl8s website. I would then seriously consider another manufacturers card perhaps powerlogix or one that allows the 100mhz system bus to be used as it strikes me as taking two steps forward and one step back and I don't believe the benefits warrant the extra expense for the faster card(s)
To some extent you are right. PowerLogix has a 900 MHz G3 card that runs the bus at 100MHz but there is only one G4 that runs 800MHz or 1GHz: Sonnet's, with the 66 MHz bus. If you want to keep a 100 MHz Bus with a G4, get a 450 to 550 MHz one - they're quite cheap right now ($150-250), and IMO a better buy than the 800 or 1G and maybe better than PL's 900 MHz G3.
It would be interesting to see some benchmarks (in the real world) of G3 900 against a G4 card that can run at 100mhz (550mhz?!) - I think the G3 might come out on top, until Altevec became a major player in to task being performed, but things like ripping MPEGs etc I suspect the G3 would be faster than G4. Paticularly that G3 is nearly running at twice clock speed
This doesn't make sense when you backwards calculate the bus/CPU ratio which work out at 12.12x and 15.15x respectively - where if using a 100mhz bus works out at a much more logical 8x and 10x respectively?
Actually the bus is run at 66.6666 MHz so 800 MHz and 1GHz are divisible by 12x and 15x respectively. We use 66 MHz as shorthand for 66.6666 MHz.
OK now it does!! thanks. I remember from some time ago there were some issues with going faster than 10X and that was what was holding many of the CPU upgrades back, particularly on old 7x00, 8x00 and 9x00 (and clones) busses of 50mhz
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