Mosq, I'm gonna explore every avenue before I dump this card, thanks though.
OK, here's what I did today/last night.
Installed cooling fan in desk top over PC case. Installed new 500W power supply.
Deleted, then cleaned vid drivers.
Deleted, then cleaned sound drivers.
Loaded "rolled back" drivers per Straffo's recommendation.
Loaded latest drivers for sound card (audigy).
Played for an hour and a half just now..... no trouble!
I have 131vid mem listed. I did notice that my vid mem usage slowly climbed as I played but it never got over 50.6 used.
I'm still partially convinced that some of my problems were attributable to sound card. Would get odd screech in sound card even in AHI. I could alt tab out and it would go away. Couldn't in AHII though.
Last night as I attacked an A20, I got a loud screech, lockup, then boot.
no Screeches/boots tonight.