Which Xeon CPU is faster

Hi

I'm planning on buying a Xeon machine, but would like to know which of the following CPUs is better/faster:

Option 1: Intel Xeon Dual-Core (Dempsey) 3.20GHz, 2x2M Cache, 1066MHz FSB 1U Passive/2U Active Combo
Option 2: Intel® 2.0Ghz Xeon™ Processor, 1333FSB, 4MB Cache, (Active) for the SC5299-E "Pilot Point III" & SR1500 "Dowling 2" & SR1550 "Petrof Bay"


Any advice would be appreciated.

Thanks!
Edward

These are the specs for the rest of the machine:

Intel® SC5299WS (Pilot Point 4 WS) Chassis - Fixed 670W PSU, Rack Mountable, New Tool-Less Feature, 2x Chassis Fans, 1x PSU Fan
Supports up to 6 Tool-Free Cabled Drives, Upgradeable to 6x Hot-Swap Drives (SCSI / SATA) Without Power Cord
Supported Server Mainboards: Intel® S5000XVN

Intel Boxed Server Workstation Board S5000XVN (Vernonia) with 6 SATA 3Gbps ports
Support for: 2 x Multi-Core Intel® Xeon™ (DP) Processors on Intel® 5000X Chipset, 32GB Fully Buffered DIMMS (8 DIMMs)
1 x ATA, 6 x SATA, 2 x Gbe LAN, 4 x PCI Buses, 5 x Total Slots: 1x PCI Express x16, 2x PCI Express x4 (x8 connectors)
1x PCI-X 133/100MHz, 1x PCI-X 100MHz
Supported Chassis : Intel® SC5299WS & SC5400BASE Chassis

Kingston Value Ram Memory 2GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM Dual Rank, x4 Intel

Kingston Value Ram Memory 2GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM Dual Rank, x4 Intel

Seagate, 250Gb, 7200rpm, 16mb cache, NCQ, SATA-300 (Another 400GB and a 200GB hard drive will be added as well)

Sony 1.44 Floppy Disk Drive (Black)

LG 18x DVD Writer (Retail Black) : Lightscribe (Ships with free Ivory Bezel)

MSI NX8600GTS-T2D256E-HD, 256MB 16X PCI-E (DVIx 2, TV-Out, SLi) DDR3 128Bit, GPU Fan, Dual Mon Support

LG LGL1970HR-BF 19" LCD, SXGA, 1280 x 1024, 2ms, Contrast 2000:1, DVi - Slim Bezel (DVI+Analog)

Logitech Black Internet Pro PS/2 Keyboard - Internet and Multi-Media functions; incl. detachable palm rest

For working and testing:
Virtual Server 2005 R2: Virtual Machines running at the same time (that's why I have 4GB RAM - I might go for just 2GB, but would like to keep maximum performance).
Windows Server 2008 when it's released - Domain Controller. There will be about 10 users.
Exchange 2007 (10 users).
SQL Server 2008 when it's released - used for ASP.NET 2.0 websites.
ISA Server 2006 as proxy server, caching and VPN Server.
File server.
Print server.
IIS for a few websites (not major traffic)

All of the above will run at the same time.



Then on the entertainment side:
Dual boot with Windows Vista Ultimate
Gaming.
Music - will my Creative Audigy 4 Pro fit in the PCI-X 100MHz slot? I read somewhere that PCI-X is backward compatible with PCI 2.1.
Watching DVD.