- Processor
- Xeon
- Part number, changes with the configuration
- W3520
- W3540
- W3580
- E5520
- X5550
- X5570
- Speed, changes with the configuration
- 2.66 GHz
- 2.93 GHz
- 3.33 GHz
- 2.26 GHz
- 2.66 GHz
- 2.93 GHz
- Turbo Boost, changes with the configuration
- 2.93 GHz
- 3.2 GHz
- 3.6 GHz
- 2.53 GHz
- 3.06 GHz
- 3.33 GHz
- Build-to-order speeds, changes with the configuration
- 2.93 GHz, 3.33 GHz
- — Not on this configuration
- — Not on this configuration
- 2.66 GHz, 2.93 GHz
- — Not on this configuration
- — Not on this configuration
- Cores, changes with the configuration
- 4
- 4
- 4
- 8
- 8
- 8
- Processors, changes with the configuration
- — Not on this configuration
- — Not on this configuration
- — Not on this configuration
- 2
- 2
- 2
- Architecture
- 64-Bit
- System bus, changes with the configuration
- Intel QuickPath Interconnect (QPI) at 4.8 GT/s
- Intel QuickPath Interconnect (QPI) at 4.8 GT/s
- Intel QuickPath Interconnect (QPI) at 6.4 GT/s
- Intel QuickPath Interconnect (QPI) at 5.86 GT/s
- Intel QuickPath Interconnect (QPI) at 6.4 GT/s
- Intel QuickPath Interconnect (QPI) at 6.4 GT/s
- Socket
- LGA 1366 (Socket B)
- L1 cache, changes with the configuration
- 32 KB/32 KB ×4
- 32 KB/32 KB ×4
- 32 KB/32 KB ×4
- 32 KB/32 KB ×8
- 32 KB/32 KB ×8
- 32 KB/32 KB ×8
- L2/L3 cache, changes with the configuration
- 256 KB ×4, 8 MB
- 256 KB ×4, 8 MB
- 256 KB ×4, 8 MB
- 256 KB ×8, 8 MB ×2
- 256 KB ×8, 8 MB ×2
- 256 KB ×8, 8 MB ×2