|Cisco put out solid fourth-quarter numbers this week.|
Cisco's results certainly offered some respite from the gloom that has enveloped tech stocks following the recent U.S. credit downgrade. Chipmaker Nvidia ( NVDA) also put out positive numbers this week, swinging to a profit after market close on Thursday and offering robust guidance. Investors welcomed the numbers, pushing Nvidia's shares up 14.4% to $15.35 in extended trading on volume of more than 4 million, according to Nasdaq.com. Nvidia, however, dramatically surrendered these gains after market open on Friday. The company's shares were down 0.3% at $13.37 by late morning amid lingering concerns about the growth of its Tegra chips, which are used in smartphones and tablets including Motorola's ( MMI) new Photon phone. Nvidia's stock closed down 3.95% at $12.88 on Friday.