05-08-2014, 01:47 PM
FWIW, I managed to get an Asrock Z87 OC Formula for testing, and it booted up fine with four GTX 690 cards - much easier, in fact, than Intel P4304 ever was. Now to find a case... Chenbro RM41300G is the only thing that comes close, but it's not available locally, and will require modding with extra fans.