Yep 300A's in Slot1 config require the mod. There is no Mobo mod that will do this for you. A pin on the CPU is not brought out to the Slot1 edge connector. You have to drill out the via from the bottom and connect a wire on the top side.
I have a Gigabyte GA6-BXD mobo that I've been running two modded Celeron 300A's in for years at 450MHz. Dont expect to have much overclocking control on a dual mobo, they're about stability and meant for servers, not overclockers. The Celeron is meant to run at 66MHz, but the BXD can be jumpered for 100MHz which gives you a 450MHz core speed.
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