Okay -- here's how it played out in more detail:
I have two MSI PE 670s; one has a factory overclock on 1254, and the other 1241. The 1254 has an ASIC of 90.0%, and the 1241 86.3%. The 1254 runs marginally hotter than the 1241; if I run the 1254 in the top slot and the 1241 in the bottom slot, I get about a 4C difference top to bottom. If I reverse them, the 1254 in the lower slot only runs about 1C hotter. Since I know temperature causes these cards to throttle back, I was initially thinking I'd get my best results with the cards in that arrangement. And I ended up getting to 4094 that way (switching the TIM to Gelid GC-3 made a huge difference in load temperatures; prior to that I was never able to get much higher than 3900.
So I then decided to see what I could do with just one of my cards in Valley -- so, natually, I'm going to go with the 1254 card here, so that gets moved to the top slot. Once I got what I could out of that (the 2221 score), I noticed that the 1254 was running pretty decent, and when I put the 1241 back in, I just dropped it in the lower slot. Ran another SLI run, and saw that it went up over 4100. I bumped memory up +10 from there, and got the score. I crashed with a TDR about five seconds after I took the screen capture, so for all intents and purposes it was a suicide run.