Factory OC never mattered ... the RVHA SC for example always came with a nice factory OC and cooler but was nerfed by the reference board, stock VRM and no special components ... always came in last in any roundup (see bit-tech link above)
I'm curious to see how well similar cards perform ... The MSI Armor and Gaming X use the same 10 phase PCB but one is $20 cheaper than the other.... so is there a dude in the MSI marketing department silly enough not to just dismiss their best selling card ? The cards leave factory with different clocks... the MSI gaming (overclocking) app works only on the Gaming X. When tested side by side will they test any different ? ... and if the answer is no...why the heck would they release so many versions .. two with identical PCBs ?'
Another thing to look at is owner dissatisfaction ... last generation, 1 egg ratings by Gigabyte board owners were 3 times Asus and MSI.