I was definitely active on the forum before the big nuke, but I also have vague memories of an earlier forum - maybe phpBB? - which may or may not have been OcUK
I originally signed up because I was wanting to put together my first PC, probably in either 1999 or early 2000 - which I *think* was a 750Mhz Thunderbird overclocked to 900Mhz, one of the bundles OcUK were selling

Pretty sure that was with a Geforce 2 GTS (?).
I remember getting excited when I received the despatch email, and inviting my experienced PC-building friend over to help me build the PC... on a Saturday, when I was naively expecting the delivery, without realising that the courier didn't deliver on weekends unless you paid extra! I think we just sat in my bedroom all day waiting

He was not best pleased.
Then on probably the Tuesday after I went over to his place with all the bits and he helped me put the thing together, as it was the first time I'd ever built a computer. He was also doing some upgrades on his PC at the time, so we were both messing about with components on his dining room table

I distinctly remember installing Windows 98 and Q3 and trying to get the network settings right so that we could play some 1v1.
Nostalgia is a powerful thing!