You`ll be pleased!
On my old system ( Athlon 2700+, 1 Gig RAM, 9700pro and 80 GB HD) loading into 3D from starting SH3 GWX took around 10+ minutes.
With my new system (C2d 6750, 2 GIG RAM, 500 GB SATA HD, 8800 GTS 640 MB) it`s around 2-3 minutes. Heaven.