3 ms·
There's actually some issues with clock drift, and speculation whether or not original units had an accurate crystal or varied significantly in timing. The only
by BearOso 1y ago
There's actually some issues with clock drift, and speculation whether or not original units had an accurate crystal or varied significantly in timing. The only way to figure that out is to go back and ask the designers what the original spec was, and who knows if they remember. So they're not really time-perfect, because the clock speeds can vary as much as a half-percent.
- NobodyNada 1y agoIt's mostly the audio clock that is suspectible to drift. Everything except the audio subsystem is derived from a single master clock, so even if the master clock varies in frequency slightly, all the non-audio components will remain in sync with each other. That means the 2 clock cycles could theoretically make an observable difference if they cause the CPU to miss a frame deadline and cause the game to take a lag frame. But this is rather unlikely.
- BearOso 1y agoThe CPU has shown some variation, but yes, it's the APU that has a ceramic clock source that isn't even close to the same among units. Apparently those ceramic resonators have a pretty high variation, even when new. When byuu/near tried to find a middle-ground for the APU clock, the average turned out to be about 1025296 (32040.5 * 32). Some people have tested units recently and gotten an even higher average. They speculate that aging is causing the frequency to increase, but I don't really know if this is the case or if there really was that much of a discrepancy originally. It does cause some significant compatibility issues, too, like with attraction mode desyncs and random freezes.