Thank you, Laura, and good afternoon to all those listening in today.
Q2 was a strong quarter for us as we continued to ramp our high-performance product portfolio. Second quarter revenue increased 19% to $1.22 billion, and gross margin improved year-over-year. Importantly, we returned to non-GAAP net income profitability in the quarter, driven by strong growth in our Computing and Graphics segment. Looking at our Computing and Graphics segment, we made excellent progress in the quarter and reported operating profitability for the first time in 3 years based on our leadership Ryzen processor and GPU product offerings. The expansion and growing adoption of our Ryzen CPUs, combined with our sixth consecutive quarter of double-digit year-over-year graphics revenue growth, resulted in a 51% increase in Computing and Graphics segment sales year-over-year. Client computing revenue increased by strong double-digit percentage from a year ago, driven by a significant ramp and strong sell-through of our Ryzen CPUs in the first full quarter of sales.
Our Ryzen family of processors drove a richer mix of shipments, and client ASPs improved significantly from a year ago. All major PC OEMs have announced premium Ryzen-based desktop systems with widespread availability expected for the back-to-school and holiday seasons. As we move into the second half of 2017, we are on track to complete the full family of Ryzen processors, including Ryzen 3 processors targeting the mainstream and value market segments with on-shelf availability later this week; Ryzen ThreadRipper products for the high-end desktop markets with global component channel availability in early August; Ryzen PRO-based offerings targeting the commercial client segment with availability in Q3; and Ryzen Mobile APUs, which will be available for the consumer market later this year. In graphics, GPU revenue increased by a strong double-digit percentage from a year ago with higher unit shipments and ASPs driving growth across our desktop and mobile GPU products.
Demand for Radeon RX GPUs was strong in the quarter driven by gaming and cryptocurrency mining. In June, we began the introduction of our Vega GPU architecture with the launch of the Radeon Vega Frontier Edition, delivering a powerful professional workstation graphics card designed to tackle demanding design, rendering and machine intelligence workloads. Apple announced that our Radeon Pro Vega product will power the new iMac Pro, a workstation-class product line designed for creators running the most demanding workflows. In addition, Apple also announced expanded iMac offerings, which are powered by the Radeon Pro 500 series. We will launch additional Radeon Vega products at Siggraph next week, expanding further into premium portions of the consumer and professional GPU markets. Our investments in GPU compute and Radeon Instinct are continuing to build momentum. We introduced our first Vega-based Radeon Instinct data center products in June. These new GPU accelerators will significantly increase performance, efficiency and ease of implementation for machine learning and high-performance computing workloads. We also showcased a server powered by AMD's EPYC SoC and 4 Radeon Instinct MI25 accelerators, working together to deliver groundbreaking performance of 100 teraflops. Interest and excitement are high as we recently started shipments of our Radeon Instinct MI25 accelerators to strategic data center customers.
Turning to our Enterprise, Embedded and Semi-Custom segment. Revenue declined 5% year-over-year and increased 44% sequentially. The sequential revenue gains were primarily based on higher semi-custom product shipments due to seasonality. In addition, we reached an important milestone in the quarter, delivering initial EPYC server revenue. In our semi-custom business, unit shipments were up sequentially and down year-over-year as we enter the fifth year of the current game console sales cycle.
This console cycle continues to outpace previous cycles as Sony recently passed a milestone of 60 million PlayStation 4 consoles shipped. Last month, Microsoft announced the new Xbox One X with availability in November. This system will be Microsoft's smallest and most powerful Xbox ever made and will be based on the combination of high-performance CPU and GPU IP that only AMD can provide. As we look at the remainder of the year and given the maturity of the current game console cycle, we expect semi-custom revenue to be down for the full year. In our server business, last month, we launched our EPYC family of high-performance data center processors, reentering the incredibly important $16 billion data center market and setting several new industry performance records. With up to 32 high-performance "Zen" cores and an unparalleled feature set, our EPYC family of processors deliver greater competitive performance at every price point across a full range of integer, floating point, memory bandwidth and I/O benchmarks and workloads. Our 2-socket and 1-socket EPYC CPUs are designed to deliver industry-leading performance on critical enterprise, cloud and machine intelligence workloads and provide a substantial TCO advantage. At our EPYC launch event, we were joined by more than 20 leading server manufacturers and global ecosystem partners who showcased optimized support and EPYC-optimized platforms. We received compelling endorsements from OEM, cloud providers and mega data center operators, including HP Enterprise, Dell, Baidu, and Microsoft Azure with more than 20 EPYC-based platforms announced at launch. And we expect an additional 20 EPYC platforms to be available in the second half of 2017. With the strong global ecosystem and customer interest we have built around our EPYC processor family, we are on track to reenter the data center market in a major way.
In closing, we are very pleased with the trend of our quarterly results and how our products are positioned heading into the back half of the year. Our business foundation and growth opportunities are strong based on our high-performance product portfolio and our expanding customer traction. Given our first half 2017 performance and our visibility into the third quarter, we are happy to report we are progressing ahead of our annual revenue guidance, and we look forward to a strong year overall. Now I'd like to turn the call over to Devinder to provide some additional color on our second quarter financial performance. Devinder?