You need to bump that driver to a more recent version to have a chance at epoch 374. We've done almost all of our 4GB testing on 20.4.2, so I'd recommend trying that as a first step. Then, some rigs/gpus still won't be able to clear epoch 374. The only remaining option then is to cap the allocation with --eth_4g_max_alloc=373, or use MB and try --eth_4g_max_alloc=4014 and move the 4016 down in steps of maybe -2 at the time until it works. 4014 is almost enough for epoch 374, so that will most probably not work. Any extra MB you can get in there makes a difference in lost hashrate when capping the allocation, so it's worth it.