ATI Shader Clock or Nvidia Shader Clock?

Ati’s shader clock operate with core clock and nvidia shader clock operate seprately which is better?? lower temp ? better performance?
Answer #1
Actually since Fermi you cannot unlink the core and shader clock on any Nvidia card.
Linked is better because it provides better stability. Temps and performance has nothing to do with it
Answer #2
hmm which gpu has fermi technology
Answer #3
hmm which gpu has fermi technology
Every GTX 4xx card is Fermi