Altera

(ALTR) - Get Altair Engineering Inc. Class A Report

was up 4.6% in midmorning trading despite a downgrade to market perform from buy at

Thomas Weisel Partners

. Rival specialty chipmaker

Xilinx

(XLNX) - Get Xilinx, Inc. (XLNX) Report

was up 3.2% despite also being cut to market perform from buy.

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Other chipmakers were lower.

Credit Suisse First Boston

said price pressure would continue to hurt

Intel

(INTC) - Get Intel Corporation (INTC) Report

and

Advanced Micro Devices

(AMD) - Get Advanced Micro Devices, Inc. Report

through Labor Day. The firm recommended avoiding the stocks until March. Intel was down 1.7%. Advanced Micro was down 1.5%.