I currently have a Pentium 4 2.4 GHz SKT478 533MHz Northwood on a ASUS P4P800-SE with a ATi X800 XT AGP (my CPU bottlenecks with the x800 series) and am interested in purchasing a Pentium D 805 on an ASUS P5LD2-Deluxe with a ATi x800 XL PCI-E. I particularily use my computer for gaming, more specifically Battlefield 2 and Source-engine games. how big of a performance increase will I notice switching from my old setup to what I'm now interested in, considering my current CPU bottlenecks in alot of games. Also, how will the PD 805 stand-up in these games? On TomsHardware charts, it shows to be worse then a AMD64 2800, how can a dual-core processor be? Thanks.