Signs not good for smaller company...Shares in PC chip maker AMD fell another four per cent yesterday after the company issued its second profit warning in the space of just two weeks. AMD said revenues for the current quarter would now come in at around $600m, just two-thirds of original expectations of $820m to $900m. On 18 June the firm revised its sales estimates to a range of $620m to $700m, a figure which already was expected to produce a large loss for the company. The fall in share price came on a day when the rest of the US market held firm, bucking the big share price dives of the last few days. AMD's second profit warning has led to speculation the firm is losing out to Intel in the cut-price war for PC chips. The firm's share price closed at $8.43 on the New York Stock Exchange.