Theres a nice long report here with loads of benchmarks testing a P4 and G5 in lots of different tests. out of 77 tests, the X86 beat it by 58. Still reading it. its 14 pages long! Ohh, but here are the specs of the systems:

  • Dell Precision 450: Dual 3.06GHz Xeon processors, 2GB RAM and twin 120GB hard drives</p>
    • Apple Power Mac G5: Dual 2.0GHz G5 processors, 2GB RAM and 160GB hard drive
      • Dell Precision 360: 3.2GHz Pentium 4 processor, 2GB RAM and twin 120GB hard drives
        • Apple Power Mac G5: 1.8GHz G5 processor, 2GB RAM and 160GB hard drive</ul> and here is a bit more:

        <table cellSpacing=1 cellPadding=4 width=450 bgColor=white border=0> <td vAlign=top bgColor=#d3d3d3><font size=1>Specification/
        Model</font>
        <td vAlign=top bgColor=#d3d3d3>

        <font size=1>Dell Precision 450</font>

        <td vAlign=top bgColor=#d3d3d3>

        <font size=1>Apple Power Mac G5/2.0GHz</font>

        <td vAlign=top bgColor=#d3d3d3>

        <font size=1>Dell Precision 360</font>

        <td vAlign=top bgColor=#d3d3d3>

        <font size=1>Apple Power Mac G5/1.8GHz</font>

        </td>

        <td vAlign=center bgColor=#f6f6f6><font size=1>Processor Type</font> <td vAlign=center bgColor=#f6f6f6>

        <font size=1>Xeon</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>G5</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>Pentium 4</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>G5</font>

        </td>

        <td vAlign=center bgColor=#f6f6f6><font size=1>Processor Speed</font> <td vAlign=center bgColor=#f6f6f6>

        <font size=1>2 x 3.06GHz</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>2 x 2.0GHz</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>3.2GHz</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>1.8GHz</font>

        </td>

        <td vAlign=center bgColor=#f6f6f6><font size=1>Frontside Bus</font></td> <td vAlign=center bgColor=#f6f6f6> <div align=center><font size=1>533MHz</font></div> </td> <td vAlign=center bgColor=#f6f6f6> <div align=center><font size=1>1GHz</font></div> </td> <td vAlign=center bgColor=#f6f6f6> <div align=center><font size=1>800MHz</font></div> </td> <td vAlign=center bgColor=#f6f6f6> <div align=center><font size=1>900MHz</font></div> </td> <td vAlign=center bgColor=#f6f6f6><font size=1>RAM Type</font> <td vAlign=center bgColor=#f6f6f6>

        <font size=1>266MHz DDR SDRAM</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>400MHz DDR SDRAM</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>
        <font size=1>400MHz DDR SDRAM</font>
        </font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>
        <font size=1>400MHz DDR SDRAM</font>
        </font>

        </td>

        <td vAlign=center bgColor=#f6f6f6><font size=1>RAM Total</font> <td vAlign=center bgColor=#f6f6f6>

        <font size=1>2GB</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>2GB</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>2GB</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>2GB</font>

        </td>

        <td vAlign=center bgColor=#f6f6f6><font size=1>Internal Hard Drive Type</font> <td vAlign=center bgColor=#f6f6f6>

        <font size=1>IDE (ATA100)</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>Serial ATA</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>Serial ATA</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>Serial ATA</font>

        </td>

        <td vAlign=center bgColor=#f6f6f6><font size=1>Internal Hard Drive Capacity</font> <td vAlign=center bgColor=#f6f6f6>

        <font size=1>2 x 120GB</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>160GB</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>2 x 120GB</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>160GB</font>

        </td>

        <td vAlign=center bgColor=#f6f6f6><font size=1>Video</font></td> <td vAlign=center bgColor=#f6f6f6> <div align=center><font size=1>nVidia QuadraFX 1000 (1 CRT at 1280 x 1024 pixels, 75Hz connected)</font></div> </td> <td vAlign=center bgColor=#f6f6f6> <div align=center><font size=1>ATI Radeon 9600 Pro (1 CRT at 1280 x 1024 pixels, 75Hz connected)</font></div> </td> <td vAlign=center bgColor=#f6f6f6> <div align=center><font size=1>nVidia QuadraFX 1000 (1 CRT at 1280 x 1024 pixels, 75Hz connected)</font></div> </td> <td vAlign=center bgColor=#f6f6f6> <div align=center><font size=1>nVidia GeForce FX 5200 Ultra (1 CRT at 1280 x 1024 pixels, 75Hz connected)</font></div> </td> <td vAlign=center bgColor=#f6f6f6><font size=1>FireWire</font> <td vAlign=center bgColor=#f6f6f6>

        <font size=1>Adaptec DuoConnect PCI: 2 x FW400</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>Built-in:</font>
        <font size=1>2 x FW400; 1 x FireWire 800</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>
        <font size=1>Adaptec DuoConnect PCI: 2 x FW400</font>
        </font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>
        <font size=1>Built-in:</font>
        <font size=1>2 x FW400; 1 x FireWire 800</font>
        </font>

        </td>

        <td vAlign=center bgColor=#f6f6f6><font size=1>USB 2.0</font> <td vAlign=center bgColor=#f6f6f6>

        <font size=1>
        <font size=1>Built-in:</font>
        <font size=1>6 ports</font>
        </font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>
        <font size=1>
        <font size=1>
        <font size=1>Built-in:</font>
        <font size=1>3 ports</font>
        </font>
        </font>
        </font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>
        <font size=1>
        <font size=1>
        <font size=1>Built-in:</font>
        <font size=1>8 ports</font>
        </font>
        </font>
        </font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>
        <font size=1>
        <font size=1>
        <font size=1>Built-in:</font>
        <font size=1>3 ports</font>
        </font>
        </font>
        </font>

        </td>

        <td vAlign=center bgColor=#f6f6f6><font size=1>Operating System </font> <td vAlign=center bgColor=#f6f6f6>

        <font size=1>Windows XP Professional SP1</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>Mac OS X 10.3.2</font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>
        <font size=1>Windows XP Professional SP1</font>
        </font>

        <td vAlign=center bgColor=#f6f6f6>

        <font size=1>
        <font size=1>Mac OS X 10.3.2</font>
        </font>

        </td> </tbody> </table>