Thank you, Laura. And good afternoon to all of those listening in today.
We started 2018 with excellent financial results as we delivered our third straight quarter of double-digit year-over-year revenue growth. First quarter revenue of $1.65 billion grew 40% year-over-year. Gross margin improved 4 percentage points, and earnings per share increased significantly based on very strong operating and net income growth. Our strong first quarter financial results demonstrate that our long-term strategy is paying off. We are executing consistently on our product roadmap. Our customers are increasingly adopting our new products, and we are strengthening the foundation of AMD with the right long-term investments. Looking at our Computing and Graphics segment in the quarter. Excellent momentum for our premium product portfolio drove double-digit year-over-year and sequential revenue growth.
Client processor sales were significantly better than seasonality, as Ryzen processor shipments grew year-over-year and sequentially. Ryzen processors accounted for 60% of our overall client processor revenue, up from the low 40%s in Q4, with desktop and notebook client processor ASPs increasing. Product execution was strong in the quarter as we expanded our Ryzen processor portfolio with new high-performance products. We launched the first AMD Ryzen desktop APUs, combining the power of our Zen CPU and Vega GPU on a single chip, delivering the world's most powerful graphics on a desktop processor, with the Ryzen desktop 2400G. Initial sales were strong in the component channel, which contributed of the significant Ryzen processor sales increase in the quarter. Additionally, we began shipments of our second-generation Ryzen desktop CPUs based on our 12-nanometer Zen Plus architecture, delivering outstanding gaming performance and best-in-class multiprocessing leadership for gamers, creators and hardware enthusiasts. Ryzen mobile unit shipments also ramped in the quarter ahead of OEM system launches planned for Q2, driving double-digit increases in our mobile processor unit shipments, both year-over-year and sequentially. Initial Acer, HP and Lenovo platforms had strong sales in the quarter, and Dell released new notebooks and 2-in-1s in early April that further expanded our Ryzen portfolio. Additionally, our first Ryzen PRO commercial notebooks are expected to launch in Q2. Dell, HP and Lenovo are all planning to offer AMD-based commercial notebooks based on the excellent performance and features of this new APU. Overall, the number of Ryzen-based systems from OEMs continues to grow. In Q2 alone, we expect 25 new Ryzen-based consumer and commercial notebooks to launch, and our customers remain on track to bring a total of 60 Ryzen-based systems to market by the end of the year.
In Graphics, we delivered strong year-over-year revenue growth as ASP and unit shipments increased significantly. On a sequential basis, revenue increased and we outperformed seasonality with strong Radeon Vega and 500 series channel sales, driven by both gaming and blockchain demand. Gaming continues to be a top priority for us, with growth being driven by the expanding number of PC gamers and increasing demand for graphics performance to deliver more immersive experiences. Demand for our Radeon series of graphics products remained strong as new AAA game titles, such as Far Cry 5, were released. We continued our investments in gaming software and released our Radeon e-sports experience, providing a performance uplift on popular e-sports games such as Fortnite, PUBG, Dota 2 and Overwatch. We continue to see a significant demand for our Radeon Vega graphics family, as customers accelerate their RAMs based on increasing availability of our high-performing GPUs, with more supply coming to market. In professional graphics, HP and Dell both expanded their AMD Radeon Pro workstation portfolio offerings in the quarter, including HP's launch of new Zbook thin and light mobile workstations powered by the AMD Radeon Pro WX 3100. Our machine learning strategy continues to gain momentum. Mega data center partners are validating and testing our Radeon Instinct MI25 for deep learning applications, and we introduced our Radeon Open Compute ecosystem, ROCm 1.7, a top-to-bottom open solution software stack for machine learning. I'm also happy to report that our next-generation 7-nanometer Radeon Instinct product, optimized for machine learning workloads, is running in our labs, and we remain on track to provide samples to customers later this year.
Turning to our Enterprise, Embedded and Semi-Custom segment. Q1 revenue decreased year-over-year, due to lower semi-custom revenue, as expected, based on a maturity of the current game console cycle, and increased sequentially. In the quarter, Microsoft announced support for our industry-leading Radeon FreeSync technology in their Xbox One S and Xbox One X consoles, delivering stutter free gaming experiences. Server revenue increased double-digit percentage sequentially across mega data center, OEM and channel customers.
EPYC processor unit shipments nearly doubled from the previous quarter. We continue to grow our data center momentum with dozens of new design wins across key workloads, including HPC, storage, virtualization and cloud applications. Dell EMC launched 3 of their newest PowerEdge platforms, powering virtualized storage area networks, hybrid cloud applications, dense virtualization and big data analytics with EPYC 7,000 series processors. Recently, supercomputing leader, Cray, announced that it added EPYC processors to its Cray CS500 line of HPC offerings. The Cray announcement pops off a very active quarter in HPC and big data, building on workload momentum in automotive simulations, university clusters and health care. And multiple mega data center customers passed key production milestones as they look to expand their deployments of EPYC-powered instances this year. To date, there are more than 40 EPYC-based platforms in market, and we are actively working with OEMs, system integrators and channel partners to increase deployment to end customers.
We remain focused on achieving mid-single-digit server unit share by the end of 2018. Our Embedded business delivered increased revenue, unit shipments and ASPs, year-over-year and sequentially, as we introduced 2 new product families: the EPYC Embedded 3000 and the Ryzen Embedded V1000 processors, to enable a new class of thin clients, IoT and other Embedded solutions.
In closing, we are extremely pleased with our first quarter financial results and strong product execution. We believe 2018 is shaping up to be an excellent year for AMD with continued revenue growth and margin expansion driven by significant demand for our high-performance Ryzen, Radeon and EPYC products. Looking forward, we are confident that we have the right long-term strategy to deliver sustained revenue and profitability growth. The market TAM in high-performance computing will grow to over $75 billion over the next few years, including high-growth segments, like gaming, data center, machine learning and artificial intelligence. We have built a strong execution engine, and we will continue to make significant investments in hardware and software to deliver an even more compelling roadmap for our customers in 2019 and beyond. Now I'd like to turn the call over to Devinder, to provide some additional color on our first quarter financial performance.