The MI25 is a passively cooled card, i think its obvious even the FE will have higher clocks not to mention AIB cards
No it isn't. You can't cool 300W passive. All Servercards are "passive". In a Nvidia DGX1 you have 8 Tesla P100 with 1800W TDP "passive" if you call it like that. But that's nonsense. I don't know which webpage generated this (probably wtftech), but serverhardware is mostly put with passive coolers into racks. But these racks have massive fans, which push a lot of air through the racks and coolers.