vMotion between 2 hosts

Hi

I have 2 hosts in my vmware farm has  the same hardware as follow

HP Proliant DL 585 G5

Model: 16 CPUs x2.31 GHz

Processor Type: Quad-Core AMD Opteron(tm) Processor 8356

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for example host01 and host02 , I can vmotion from Host01 to host02 any vm , but not from host02 to host01 , it gives me CPU issue

I cannot find any reason as the CPU in both hosts are the same , any idea ?