By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- The broad tech sector was putting in a mixed performance Wednesday, but it was losses by IBM Corp. and Advanced Micro Devices Inc. that garnered much of investors' attention on disappointing reaction to their business forecasts.

IBM (IBM) fell by 3.3%, to $182.16 after the tech giant on Tuesday reported a fourth-quarter profit that improved from a year ago, but recorded sales that failed to meet Wall Street analysts' forecasts. IBM said that for its fourth quarter, it earned $6.2 billion, or $5.73 a share, on $27.7 billion in revenue. During the same period in 2012, IBM earned $5.83 billion, or $5.13 a share, on revenue of $29.3 billion. IBM also reported an operating profit of $6.13 a share. Analysts surveyed by FactSet had forecast IBM to earn $5.99 a share on $28.27 billion in sales.

Much of IBM's disappointing sales were attributed to weakness in its hardware business, which recorded a 26% drop in revenue, to $4.3 billion.

Still, IBM said it expects its earnings for all of 2014 to be at least $17 a share, or at least $18 a share on an operating basis. Analysts had earlier forecast IBM to earn $18.02 a share for the year.

IBM doesn't directly provide quarterly earnings and revenue forecasts. But on a conference call to discuss IBM's results, Ben Reitzes, of Barclays, said that based on comments from IBM, the company appeared to be headed toward a first-quarter profit of $2.50 a share. That figure would miss the consensus estimate for earnings of $3.27 a share.

While not confirming Reitzes' estimates, IBM's Chief Financial Officer, Martin Schroeter said, "We think your math is where we would put it, and then on a year-to-year base we feel like we have a pretty good game plan for 2014."

However, Reitzes said Wednesday that due to factors such as the decline in hardware sales, IBM has its work cut out to meet it its forecasts.

"With the end of the mainframe cycle and weakness in emerging markets, coupled with pressure from cloud [services], revenue should remain pressured," Reitzes said. "We believe that the outlooks for 2014 and 2015 are difficult to achieve without the help of taxes and gains, since growth seems elusive."

But IBM wasn't having as bad a day as AMD (AMD).

The semiconductor company's shares fell almost 11%, to $3.71 after it said Tuesday that it expects its first-quarter revenue to fall 16%, "plus or minus 3%" from the $1.59 billion it reported in its 2013 fourth quarter. The weak outlook also dimmed any enthusiasm that AMD might have expected from swinging to a fourth-quarter profit of 12 cents a share, from a loss of 63 cents a share in the year-ago period.

Among other leading tech stocks, Netflix Inc. (NFLX) was up by $1.48 a share at $329.96, and eBay Inc. (EBAY) slipped by 4 cents a share, to $54.12. Both companies are slated to report quarterly results after the close of trading Wednesday.

The tech-heavy Nasdaq Composite Index (RIXF) rose 5 points to 4,231. The Philadelphia Semiconductor Index (SOX) edged into positive territory.

More tech-sector news from MarketWatch:

New U.S. subscribers key to Netflix's results

Icahn: Apple doing 'disservice' to investors

Yahoo's Mayer: 2014 is the tipping point for the Internet

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