Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Applied Micro Circuits (NASDAQ:AMCC) have jumped today by as much as 18% following a bullish analyst upgrade.

So what: Raymond James analyst Hans Mosesmann boosted his rating on Applied Micro Circuits from "outperform" to "strong buy," while increasing his price target from $10.50 to $13. Mosesmann believes investors aren't appreciating the potential of the company's new X-Gene microprocessor.

Now what: The ARM-based X-Gene chips target the micro-server market and offer 70% of the performance of Intel's Xeon chips. The analyst believes that X-Gene is still six months to 12 months ahead of rival 64-bit ARM chips, which should allow Applied Micro to grab the bulk of the ARM server market in coming years. Applied Micro is set to announce fiscal first quarter earnings on July 24.

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Fool contributor Evan Niu, CFA, has no position in any stocks mentioned. The Motley Fool recommends Intel. The Motley Fool owns shares of Intel. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.