Thank you, Laura, and good afternoon to all those listening in today.
We ended the first half of 2018 strong, delivering our fourth consecutive quarter of double-digit year-over-year revenue growth, driven by increased demand for our high-performance products. Second quarter revenue of $1.76 billion grew 53% year-over-year, and gross margin improved more than 3 percentage points, resulting in our highest quarterly net income in 7 years. We are very pleased with the year-over-year financial performance across both of our business segments as we continue to gain share driven by strong customer adoption of our new products in the PC, gaming and data center markets. Looking at our Computing and Graphics segment, second quarter CG segment revenue increased 64% year-over-year, driven by strong demand for our Radeon GPUs and a significant ramp of our Ryzen mobile processors.
Ryzen unit shipments grew strong double-digit sequentially, as Ryzen mobile processor shipments more than doubled in the quarter. Acer, Asus, Dell, HP, Huawei, Lenovo and Samsung launched dozens of Ryzen processor-based notebooks, which position us well to continue growing Ryzen mobile sales heading into the back-to-school and holiday seasons. In the commercial PC market, we launched our Ryzen PRO commercial mobile APUs in the quarter. For the first time in our history, all 3 major commercial OEMs: Dell, HP and Lenovo, now offer enterprise-class notebooks and desktops powered by AMD, and we are seeing strong initial interest as customers evaluate these new systems.
Continuing our strong roadmap execution, we launched our second generation Ryzen desktop CPU to very positive reviews in April, just 13 months after the first Ryzen desktop processors were released. Additionally, in June, we delivered the first public demonstration of our second generation AMD Ryzen Threadripper processors with the industry's first 32-core PC processor designed for the high-end desktop market. We are on track to launch our second generation Threadripper processor in August, with leadership performance for the enthusiast and content creation markets. Overall, we are very pleased with the market adoption of our Ryzen processors. 44 consumer and commercial Ryzen-based desktops and notebooks have been launched this year, and our customers remain on track to bring a total of 60 Ryzen-based systems to market in 2018.
In Graphics, strong channel and data center demand drove significant year-over-year increases in revenue and ASPs. Sequentially, graphics revenue was down, primarily driven by lower blockchain-related sales, partially offset by stronger data center sales. Sales into the high-end enthusiast and performance portions of the gaming market grew substantially year-over-year based on the adoption of our latest Radeon RX 500 and Vega series GPUs. We continue to execute our software strategy to provide the best gaming experience in the industry with new AMD Radeon GPU drivers published for every major game launched in the quarter, and expanded partnerships with Ubisoft, Capcom and Rebellion to optimize their next generation of games on Radeon graphics. On the hardware side, we continued to expand the adoption of our Radeon Vega architecture with the introduction of new OEM systems and AIB cards in smaller and more mobile form factors. Samsung also announced they added our FreeSync technology to many of their high-end TVs, giving PC and console gamers the ultimate big screen gaming experience. The AMD FreeSync ecosystem is the broadest in the industry, with more than 400 FreeSync-enabled monitors and TVs in market to date. Data center GPU revenue increased significantly in the quarter, driven by Vega-based Radeon Instinct MI25 shipments.
Our GPU engagements with large cloud customers continued to expand as we increased our investments in hardware and open software solutions in this important space. At COMPUTEX this year, we showed the first public demonstration of our next-generation 7-nanometer Radeon Vega GPU, which includes new features optimized for the artificial intelligence and machine learning markets. We started sampling of this product in the second quarter and we are on track to launch this next-generation product, the world's first 7-nanometer GPU, later this year.
Turning to our Enterprise, Embedded and Semi-Custom segment. Second quarter segment revenue increased 37% year-over-year, primarily driven by strong semi-custom sales and growing adoption of our EPYC data center processors.
Starting with our server business, we celebrated our 1-year anniversary of the launch of our EPYC server processors with an increase of greater than 50% in both revenue and unit shipments sequentially. We have over 50 customer platforms now in market, including Cisco, who announced their highest density server offering ever powered by EPYC processors; and HP Enterprise who launched their first EPYC-based single-socket ProLiant server, which delivers significantly lower cost per virtual machine than the leading dual socket competitor. We also saw strong progress with our mega data center partners, as Tencent Cloud announced immediate availability of their SA1 Cloud service, delivering 30% lower cost per VM with outstanding performance across key workloads. Shipments for mega data center customers more than doubled in the quarter as we made significant progress towards qualification of production instances at multiple cloud providers in anticipation of deployments planned in the second half of this year. We're also seeing momentum from Tier 2 next wave cloud service providers that have the ability to ramp quickly with a noted preference for the value and capability that our EPYC single-socket offering brings.
Turning to large enterprise customers. We added dozens of new end customers in the quarter. Our value proposition continues to be strong in segments like HPC, data analytics and in general-purpose virtualized enterprise environments. We are extremely focused on accelerating EPYC processor adoption in these targeted segments in the second half of the year. Finally, I'm very pleased with our execution against our long-term roadmap. We received first silicon of our next-generation 7-nanometer EPYC processor with Zen 2, codename Rome, in the second quarter, and the silicon quality and bring up has gone very well. I am happy to report that we recently started sampling Rome to select partners for early validation, and we are on track to launch in 2019, strengthening our already outstanding competitive position in the market. We remain focused on our near-term milestone of achieving mid-single-digit server unit share by the end of 2018 on the path to our midterm goal of double-digit market share.
Moving on to our Semi-Custom and Embedded businesses. Semi-custom revenue increased year-over-year and sequentially in support of Sony and Microsoft game consoles. We are proud that Microsoft and Sony have collectively shipped well over 100 million AMD-powered game consoles in the current cycle. The game console market continues to be an important segment for us in the long term and we are well-positioned based on our strong partnerships and differentiated IT and design capabilities.
Embedded sales increased by double-digit percentage year-over-year, driven by growth across the embedded gaming, industrial and medical imaging markets. We also saw strong initial design wins for our new EPYC and Ryzen Embedded product families following their launch last quarter.
In closing, we are very pleased with our second quarter financial results. We delivered strong revenue growth, and margin expansion as demand for our new high-performance products continued to accelerate.
Most importantly, we believe our long-term technology bets position us very well for the future. Several years ago, we made important decisions around our CPU and GPU roadmaps to drive leadership at the 7-nanometer node. We now have line of sight to those products coming to market and we see incredible opportunities ahead based on the competitive positioning and customer interest in our upcoming 7-nanometer products. We are confident that with continued execution, we are on an excellent trajectory to drive market share gains and growth in revenue and profitability. We are focused on that continued execution as we make significant investments in our hardware and software roadmaps to deliver even more compelling products to our customers in the 2019 and 2020 timeframe.
Now I'd like to turn the call over to Devinder, to provide some additional color on our second quarter financial performance. Devinder?