Windows 7: Core Speed and Multipler Question

I purchased a Dell 8500 XPS with i7 -3770 CPU. I have just run SIW CPU Info and obtained the following:

Property Value
FRANK-PC (Dell Inc. XPS 8500)
Summary
Number of Physical Processors 1
Number of Cores per Processor 4
Number of Logical Processors 8
CPU #1 Intel Core i3/i5/i7
CPU Name Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
CPU Code Name Ivy Bridge
Vendor GenuineIntel
Number of Bits 64
Instruction Set MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, ET64, XD, VMX, SMX, EST
Platform Name [unknown]
Revision [unknown]
Technology 22 nm
Original Clock 3400 MHz
Original System Clock 100 MHz
Original Multiplier 34.0
CPU Clock 3400 MHz
System Clock 99.9 MHz
Number of Cores 4
Core #1
Speed 1598.0 MHz
Multiplier 16.0
Core #2
Speed 1598.0 MHz
Multiplier 16.0
Core #3
Speed 1598.0 MHz
Multiplier 16.0
Core #4
Speed 3695.4 MHz
Multiplier 37.0
Turbo Boost Enabled
Virtual Technology Enabled
SLAT Supported
Hyper Threading Enabled
Cache
L1 Data Cache 4 x 32 KBytes
L1 Instructions Cache 4 x 32 KBytes
L2 Cache 4 x 256 KBytes
L3 Cache 8192 KBytes



Is it normal to have different speeds and multiplier on cores? ( see core # 4 speed and multiplier above )

With Turbo boost, when the rest of the cores are idle, one of the cores can be boosted above normal multiplier. A multiplier of 16 indicates cores 1-3 are idle (idle with speedstep will lower your multiplier to a minimum of 16) while 4 is boosted to 3.7 GHz. This gives single threaded applications faster CPU cycles.

Thanks I appreciate the reply.