
Are the following mentions coreferent?:
<m> announced </m> in RBC Capital Markets downgraded ATI Technologies to sector perform from outperform after Advanced Micro Devices announced its intention to buy the Canadian graphics chip-maker for $ 5.4 billion on Monday. 
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<m> said </m> in The pitched battle for supremacy in the chip-making market reached a critical phase yesterday with Advanced Micro Devices ( AMD ) in Sunnyvale, Calif. announcing its decision to acquire Canadian graphic cards manufacturer ATI Technologies ( ATI ). The imminent purchase of ATI is the most vital element in AMD's concerted campaign to dethrone the mighty Intel Corp. 