Advanced Micro Devices Inc. began selling a new generation of chips for the servers that drive computing in data centers, challenging Intel Corp. in that high-margin market for the first time in years.

AMD on Tuesday introduced the first four of nine chips dubbed Epyc that it claims offer higher performance at lower prices than comparable Intel chips currently on the market. Intel has said it will refresh its server processors over the summer.

The Epyc line reintroduces competition to a high-margin arena that Intel lately has had to itself. Intel holds nearly 100% share of the $16.5 billion market for server chips of the most popular type known as x86, according to Mercury Research. That dominance helped the chip giant keep prices high and achieve a gross margin—a key measure of profitability—of 61% in 2016, compared with 23% for AMD.

Other chip makers also are challenging Intel in servers. Qualcomm Inc. and Cavium Inc. in March demonstrated chips running Microsoft Corp.’s Windows Server operating system—an Intel staple—based on technology from ARM Holdings, a division of SoftBank Group Corp.

International Business Machines Corp. has said it would ship new server chips based on its own designs in the second half of the year.