RIP is my favourite SPEED METAL album of all time. I have a hard time thinking of it as a 'THRASH' album per se. Oh well, that's just me.
Also, here's an observation: the term 'Power Metal' has become a four-letter word as I'm sure you're all aware. IMO, there are essentially three types of PM offshoots:
1 - Those that were spawned from Helloween - Keeper of the 7 Keys I & II
2 - Those that were spawned from Judas Priest - Painkiller
3 - Those that were spawned from Megadeth - Rust in Peace
That's why the term PM is ridiculous, since #1, 2, 3 and all too different to group together.
The number #3 category has some seriously good shit which I would also refer to as speed metal, and not power metal.