The ratings of three Computer and Personal Electronics stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Fusion-io‘s (NYSE:FIO) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Fusion-io provides data-centric computing solutions through a storage memory platform for data decentralization. In Portfolio Grader’s specific subcategories of Earnings Growth and Earnings Momentum, FIO also gets F’s. The stock price has dropped 12.8% over the past month, worse than 0.8% increase the S&P 500 has seen over the same period of time. As of Aug. 3, 23.2% of outstanding Fusion-io shares were held short. The stock’s trailing PE Ratio is 607.3. To get an in-depth look at FIO, get Portfolio Grader’s complete analysis of FIO stock.

Electronics for Imaging (NASDAQ:EFII) earns a D this week, falling from last week’s grade of C. Electronics For Imaging designs and markets products that support color and black-and-white printing on a variety of peripheral devices. Wall Street appears to agree with the stock downgrade, with share prices dropping 9.9% over the past month. For a full analysis of EFII stock, visit Portfolio Grader.

Lexmark‘s (NYSE:LXK) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”) last week. Lexmark International develops, manufactures, and supplies printing and imaging solutions for offices and homes. Share prices fell 35.3% over the past month. For more information, get Portfolio Grader’s complete analysis of LXK 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.