Using PCI Latency Tool 3.1 brought the audio card down to 32 from the previous 64 and it had a perfect zero result under FSX to resolve the problem. Have yet to find under TS, but seen the results under the FSX... I don't think there'll be any step forward. 
All the other devices are set at latency 0, only the audio card was at 64... I'm rather dubious if it is a good idea to put to not the latency of the audio card too, to see if perhaps starts working well. :-/
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I have never seen a vid card with a zero latency setting; the vid card is the heaviest user of the bus, settings in the 96-132 range are common. Audio cards are almost always at 32; if you're doing heavy RTA sound work a setting as high as 64 may be necessary, but this is rare. Occasionally a LAN card will get a latency setting, but this is uncommon and usually a very low setting (8-10).
The total of all latency settings cannot exceed 256, and should never even come close to that. Usually only the audio and video cards will have a specified latency since they are transmitting a lot of high priority data with noticeable consequences if this is interrupted. Any device with an IRQ will have a latency though most are not directly adjustable and are effectively set to zero; which, if I understand correctly, means they are only given bus access if they specifically request it and will lose it once anything else requests it. Any device not given a latency value will be treated as if it were zero.
Latency is something that rarely needs adjusting, unless something like sound problems arise, or a driver/software install changes the settings adversely. The 128 for vid, 32 for audio, are almost standard settings.
Posted: Sun Jun 26, 2011 8:34 am
