Yeah. With OC, Virtual Hydlide music skips gone. Not sure how much it needs, if its a GPU or CPU thing, I just used max to be sure.
I guess HUD can be hide using a transparent graphic. I'm having troubles with UnityEX Ultimate tho, it does not recognize the graphics version directly, so I can only export them as RAW.
Actua Soccer Works fine, but it has noticeable input lag.
Akumajō Dracula X: Gekka no Yasōkyoku Works fine (only tested the initial Dracula fight).
Andretti Racing: Works fine, but it has crazy amount of input lag. Hardly playable.
Alien Trilogy: Works fine.
Bug!: It seems to work fine, with a bit of input lag, but it crashed for me once. I retried and I could finish three stages in a row, so.. better save every level, just in case.
Burning Rangers: Works fine. Perfect performance on the tutorial, haven't tested more.
Clockwork Knight: Works fine.
Clockwork Knight 2: Crashes after the main menu.
Crypt Killer: Crashes instantly.
Croc: A bit of input lag. Logo videos do not play, some fonts are corrupted and in the second level there's a corrupted screen you cannot bypass (it could be random, I haven't tried again). Oh, well, Argonatu's black magic right here.
Darius Gaiden: Works fine, no input lag.
Daytona USA: Works fine but sound is very low, compared to the rest of the games.
Dead or Alive: Black screen. It could have been a wrong cue file, let me re-check tomorrow.
Deep Fear (US prototype): Unplayable, it always hangs in one of the first corridors, with a corrupted screen. I haven't tested the retail EU version yet.
Die Hard Arcade: Works fine.
Die Hard Trilogy: Works fine (only tested the on rails part).
Dungeons and Dragons: Shadow over Mystara: 4MB games do not work.