So it's been a bit, mostly because there hasn't been anything significant to report. Something I did forget to mention earlier: The fan weirdness was total PEBKAC. I let the thing run way too long before popping my head in to discover that a cable was preventing one of the fans from even spinning. Oops. Next set of observations:
- ARC Control limits it to 190W by default, pretty far below the 225W TDP. Even at this power level, temps get up to 80+ pretty easily
- Like many cards, a slight underclock can knock temps down appreciably. 200 MHz got me 5C, IIRC
- Compatibility isn't yet universal. Last Epoch, for example (which granted is Early Access), will simply not run. If you can even get to the splash screen, it will crash before getting in-game. Nothing else I've tried has shown such poor behaviour, however.
- Not A750 specific, but why do modern cards need so much heatsink? Don't remember how much my 190W R9 380 actually pulled, but it operated perfectly happily on half or less the A750's HSF, even with one dead fan. My 2-fan 1070ti operates at the same temp as my 3-fan 5600 XT while pulling 30-50 more watts, on something like 2/3 the cooler (both mass and size). Transistor density, I suppose
Sadly, it's back in its box, which is a shame because it's the most potent card I own. But it's no good for F@H, and Last Epoch is one of the games a friend and I play on our weekly session. I'll see about digging it back out in a few months, but can't promise to remember to record the results here.