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:
        <td vAlign=top bgColor=#d3d3d3>**Specification/ Model** <td vAlign=top bgColor=#d3d3d3>
        Dell Precision 450
        <td vAlign=top bgColor=#d3d3d3>
        Apple Power Mac G5/2.0GHz
        <td vAlign=top bgColor=#d3d3d3>
        Dell Precision 360
        <td vAlign=top bgColor=#d3d3d3>
        Apple Power Mac G5/1.8GHz
        </td> <td vAlign=center bgColor=#f6f6f6>**Processor Type** <td vAlign=center bgColor=#f6f6f6>
        Xeon
        <td vAlign=center bgColor=#f6f6f6>
        G5
        <td vAlign=center bgColor=#f6f6f6>
        Pentium 4
        <td vAlign=center bgColor=#f6f6f6>
        G5
        </td> <td vAlign=center bgColor=#f6f6f6>**Processor Speed** <td vAlign=center bgColor=#f6f6f6>
        2 x 3.06GHz
        <td vAlign=center bgColor=#f6f6f6>
        2 x 2.0GHz
        <td vAlign=center bgColor=#f6f6f6>
        3.2GHz
        <td vAlign=center bgColor=#f6f6f6>
        1.8GHz
        </td> <td vAlign=center bgColor=#f6f6f6>**Frontside Bus**</td> <td vAlign=center bgColor=#f6f6f6>
        533MHz
        </td> <td vAlign=center bgColor=#f6f6f6>
        1GHz
        </td> <td vAlign=center bgColor=#f6f6f6>
        800MHz
        </td> <td vAlign=center bgColor=#f6f6f6>
        900MHz
        </td> <td vAlign=center bgColor=#f6f6f6>**RAM Type** <td vAlign=center bgColor=#f6f6f6>
        266MHz DDR SDRAM
        <td vAlign=center bgColor=#f6f6f6>
        400MHz DDR SDRAM
        <td vAlign=center bgColor=#f6f6f6>
        400MHz DDR SDRAM
        <td vAlign=center bgColor=#f6f6f6>
        400MHz DDR SDRAM
        </td> <td vAlign=center bgColor=#f6f6f6>**RAM Total** <td vAlign=center bgColor=#f6f6f6>
        2GB
        <td vAlign=center bgColor=#f6f6f6>
        2GB
        <td vAlign=center bgColor=#f6f6f6>
        2GB
        <td vAlign=center bgColor=#f6f6f6>
        2GB
        </td> <td vAlign=center bgColor=#f6f6f6>**Internal Hard Drive Type** <td vAlign=center bgColor=#f6f6f6>
        IDE (ATA100)
        <td vAlign=center bgColor=#f6f6f6>
        Serial ATA
        <td vAlign=center bgColor=#f6f6f6>
        Serial ATA
        <td vAlign=center bgColor=#f6f6f6>
        Serial ATA
        </td> <td vAlign=center bgColor=#f6f6f6>**Internal Hard Drive Capacity** <td vAlign=center bgColor=#f6f6f6>
        2 x 120GB
        <td vAlign=center bgColor=#f6f6f6>
        160GB
        <td vAlign=center bgColor=#f6f6f6>
        2 x 120GB
        <td vAlign=center bgColor=#f6f6f6>
        160GB
        </td> <td vAlign=center bgColor=#f6f6f6>**Video**</td> <td vAlign=center bgColor=#f6f6f6>
        nVidia QuadraFX 1000 (1 CRT at 1280 x 1024 pixels, 75Hz connected)
        </td> <td vAlign=center bgColor=#f6f6f6>
        ATI Radeon 9600 Pro (1 CRT at 1280 x 1024 pixels, 75Hz connected)
        </td> <td vAlign=center bgColor=#f6f6f6>
        nVidia QuadraFX 1000 (1 CRT at 1280 x 1024 pixels, 75Hz connected)
        </td> <td vAlign=center bgColor=#f6f6f6>
        nVidia GeForce FX 5200 Ultra (1 CRT at 1280 x 1024 pixels, 75Hz connected)
        </td> <td vAlign=center bgColor=#f6f6f6>**FireWire** <td vAlign=center bgColor=#f6f6f6>
        Adaptec DuoConnect PCI: 2 x FW400
        <td vAlign=center bgColor=#f6f6f6>
        Built-in:
        2 x FW400; 1 x FireWire 800
        <td vAlign=center bgColor=#f6f6f6>
        Adaptec DuoConnect PCI: 2 x FW400
        <td vAlign=center bgColor=#f6f6f6>
        Built-in:
        2 x FW400; 1 x FireWire 800
        </td> <td vAlign=center bgColor=#f6f6f6>**USB 2.0** <td vAlign=center bgColor=#f6f6f6>
        Built-in:
        6 ports
        <td vAlign=center bgColor=#f6f6f6>
        Built-in:
        3 ports
        <td vAlign=center bgColor=#f6f6f6>
        Built-in:
        8 ports
        <td vAlign=center bgColor=#f6f6f6>
        Built-in:
        3 ports
        </td> <td vAlign=center bgColor=#f6f6f6>**Operating System**  <td vAlign=center bgColor=#f6f6f6>
        Windows XP Professional SP1
        <td vAlign=center bgColor=#f6f6f6>
        Mac OS X 10.3.2
        <td vAlign=center bgColor=#f6f6f6>
        Windows XP Professional SP1
        <td vAlign=center bgColor=#f6f6f6>
        Mac OS X 10.3.2
        </td> </tbody>