This week, five computer and personal electronics stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Apple (AAPL) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. Apple offers a variety of personal computers, mobile devices, portable digital music and video players, and related software, services, peripherals, and networking solutions. In Portfolio Grader’s specific subcategories of Equity and Cash Flow, AAPL also gets A’s. The current dividend yield is 12.2%. For more information, get Portfolio Grader’s complete analysis of AAPL stock.

Super Micro Computer, Inc. (SMCI) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. Super Micro Computer designs, develops, manufactures and sells application-optimized, high-performance server solutions based on a modular and open-standard architecture. Shares of SMCI have increased 23.2% over the past month, better than the 1.3% decrease the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of SMCI stock.

SMART Technologies Inc. Class A (SMT) shows solid improvement this week. The company’s rating rises from a C to a B. SMART Technologies designs, develops and sells interactive technology solutions. For more information, get Portfolio Grader’s complete analysis of SMT stock.

China Digital TV Holding Co., Ltd. Sponsored ADR (STV) gets a higher grade this week, advancing from a C last week to a B. China Digital TV provides conditional access (CA) systems to the digital television market in the People’s Republic of China. For more information, get Portfolio Grader’s complete analysis of STV stock.

Novatel Wireless, Inc. (NVTL) improves from a C to a B rating this week. Novatel Wireless provides wireless data modems and software for use with handheld computing devices and portable personal electronics. For more information, get Portfolio Grader’s complete analysis of NVTL stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.