Can someone please help: I posted before asking the diff between notebooks and desktops with the same specifications. For the most part I now know that unless the specs are truly identical, desktops are faster. But someone said usually 1 GHz notebook doesn't have the same cache and bus speeds as a 1GHz desktop. I looked this up on Apple's site and noticed the following: Current model powerbooks (15-inch): 1GHz or 1.25GHz PowerPC G4 processor with Velocity Engine 512K SRAM on-chip L2 cache 167MHz system bus Previous generation G4 PowerMacs: 1.25GHz PowerPC G4 processor Full 128-bit internal memory data paths 256K on-chip L2 cache running at processor speed 1MB DDR SRAM L3 cache per processor (2MB DDR SRAM L3 cache per processor with dual 1.25GHz PowerPC G4 build-to-order option) 167MHz system bus supporting over 1.3GBps data throughput Could someone please explain L2 vs L3 cache and what it means and does to me? Also, where does bus speed come in and how does it affect things? I'm guessing the desktop is faster? Thanks for your time.