Can only see one core temp on 7850X2.

Hi folks, having small issue with this cpu - just got it. With either speed fan or coretemp I am unable to see both cores. Speed fan gives me a temp 1 (43C at idle) temp 2 is 30C at idle, and 'core' -26C at idle.

When I run coretemp it only lists one core, and gives 26C for that core. Doesn't even mention any other core.

When I read prime95 it does run separate processes for each core, so put my fears at ease that I had been sold a single core chip!  

I'm new to overclocking AMDs, since my athlon 700mhz about 7 years ago - my main comp is a conroe q6600 and coretemp gives me the expected 4 core readings for that cpu, so not sure what's going on here?

Cheers
Jon

PS am on coretemp 0.99.5beta and speedfan 4.38 so they are the latest versions.