
Are the following mentions coreferent?:
<m> said </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. RBC analyst Steve Arthur said there is limited upside to the offer unless competing bids are made for ATI. For now, Arthur said AMD's takeover deal, which is expected to close in the fourth quarter, effectively offers his one-year price target of $ 21 now. 
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<m> announced </m> in Yesterday Advanced Micro Devices Inc. ( AMD ), a leading global CPU maker, announced its purchase of Canada-based graphics chips maker ATI Technologies Inc. in a US $ 5.4 billion deal that many said would help AMD compete more effectively with Intel Corp., its largest-in-the-world rival. 