Ok this is resolved - re-installing the OS fixed the issue. I see all 8 cpu's (physical and virtual) in task manager, Core Temp shows all 4 CPU's now with thermals and CPU-Z any version see's all 4 cores and 8 threads.
So lesson of the day, changing out a motherboard and CPU, do a fresh format of your HDD.
I've been looking on the internet for awhile now. I have a buddy who noticed I only have 4 cpu's in the task manager, I never put much thought into it since I figured I might of had hyperthreading disabled, but anyways.
I have the Core i7 2700k a Quad core cpu, should be 4 cores and 8 threads with hyperthreading enabled. So in task manager I should see 8 cpu graph's since each core is divided into 2. But I only see a total of 4. CPU-Z tells me I have 2 cores 4 threads... wtf? Bios says all cores are enabled and I have the choice of enable 1 2 3 or all cores in that list.
So what's the issue or is this normal and there is no issue, doesn't appear normal to me though.
Motherboard: AsRock Z68 Extreme3 Gen3
CPU: Intel Core i7 2700k 3.5Ghz