Also not mentioned is that the GPU already runs out of "grunt" before it actually runs out of memory...... Adding another 4GB (well, 3.5GB+0.5GB really) would leave you with 50% unusable VRAM.....but at least people wouldn't bitch and moan about getting stutters/hitching when they break 3.5GB because of the segregated 500MB....instead they'd be bitching about the segregated 1GB that they could never possibly utilize anyway.