Thank you, Laura, and good afternoon to all those listening in today. We executed well on the third quarter.
We continued to build momentum for our new products as strong sales of our Ryzen and EPYC processors offset soft GPU channel sales and drove our fifth consecutive quarter of year-on-year revenue growth, increased profitability and margin expansion. Third quarter revenue was $1.65 billion, an increase of 4% from a year ago. Looking at our Computing and Graphics segment, third quarter CG segment revenue increased 12% year-on-year, driven by significant growth in both client processor and OEM GPU sales that offset a larger-than-expected decline in channel GPU sales. Ryzen processor sales increased to more than 70% of our total client revenue in the quarter. We delivered our highest processor unit shipments in nearly 4 years and believe we gained desktop and notebook client processor unit share in the quarter, driven by growth with both OEMs and in the channel.
In desktop, we had strong demand for our higher-end Ryzen 7, Ryzen 5 and Ryzen Threadripper processors, helping to drive a double-digit percentage year-over-year and sequential improvement in client processor ASP. We expanded our desktop offerings in the quarter, bringing our Zen processor core and Vega graphics to the entry-level part of the market with the Athlon APU and launching our flagship 32-core Threadripper 2 processor. With these new introductions, we now have a top to bottom lineup of client processors based on our high-performance Zen architecture. In notebooks, Ryzen Mobile processor unit shipments doubled sequentially for the second straight quarter as OEMs ramped production of their latest AMD-based notebooks. 54 of the 60 Ryzen processor-based notebooks planned for 2008 (sic) [ 2018 ] have launched, with the final notebooks expected to go on sale this quarter. Based on the success of first-generation Ryzen Mobile notebooks, the expanded breadth of our customer engagements and our design win momentum, we are on track for an even larger assortment of AMD-powered notebooks in 2019.
In graphics, the year-over-year revenue decrease was primarily driven by significantly lower channel GPU sales, partially offset by improved OEM and data center GPU sales. Channel GPU sales came in lower than expected based on excess channel inventory levels caused by the decline in blockchain-related demand that was so strong earlier in the year. OEM GPU sales in the third quarter increased by a strong double-digit percentage year-over-year as new design wins began to ramp, including first shipments of our mobile Vega GPUs to support new premium notebooks launching this quarter. In professional graphics, revenue increased by a double-digit percentage from a year ago, driven by data center GPU sales as we continued to gain traction in this important part of the market. We launched the Radeon Pro WX 8200 GPU for workstations in the quarter, delivering the world's best workstation graphics performance under $1,000 on real-time visualization, VR and photorealistic editing workloads. We remain on track to launch the industry's first 7-nanometer data center GPU this quarter. Customer interest in the product is strong based on its performance and differentiated feature set, and we have already secured multiple data center wins with shipments expected to begin in the fourth quarter. We continued to increase investments in GPU hardware and software to deliver industry-leading products that we believe will drive growth in the gaming, professional and data center markets.
Turning to our Enterprise, Embedded and Semi-Custom segment. Third quarter revenue decreased 5% year-on-year primarily based on semi-custom sales declining, as expected, as current generation consoles entered their sixth year. In server, we delivered our third straight quarter of strong double-digit percentage sequential revenue and unit shipment growth.
We are seeing the largest demand for our top of the stack 24- and 32-core EPYC processors, which combine industry-leading core count and I/O to deliver performance advantages across cloud, virtualization and HPC workloads. We continued to accelerate engagements with our cloud service providers, highlighted by yesterday's announcement that Oracle launched new AMD-powered emphasis that offer significant TCO and performance advantages on general-purpose cloud workloads and Oracle applications. We expect additional Tier 1 cloud service providers to announce availability of new EPYC processor deployment this quarter. We secured multiple new customer wins on the HPC front, including Microsoft's announcement they would offer an EPYC processor-based supercomputing instance, and that Haas Racing has chosen Cray to build an EPYC-powered supercomputer to improve their computational fluid dynamics modeling for future cars.
Turning to enterprise adoption. We continue to build a strong pipeline and accelerate the ongoing ramps of EPYC-based offerings from the major OEMs, including Cisco, Dell and HP Enterprise. In the third quarter, we added dozens of new end customers across oil and gas, health care, aerospace, banking and other industries based on the superior performance of EPYC processors in both data analytics and general-purpose virtualized workloads. We began sampling our next-generation Rome server chip broadly across our customer base in the third quarter, and the feedback on this leadership product is very strong. As a result, cloud and OEM customers are engaging earlier, deeper and more collaboratively with us on both Rome and our long-term data center road map. We remain on track to exit the year with mid-single-digit server unit market share based on cloud customer adoption. And based on our strong competitive position and broad customer engagements, we believe we can achieve double-digit server unit share with Rome.
In closing, 2018 remains an inflection point for AMD as we expect to exit the year with well over 50% of our revenue coming from new products, driving significant margin expansion. The foundational changes we have made across the business to strengthen our execution, and the investments we have made to deliver a leadership Computing and Graphics road map are paying off. Our current generations of high-performance CPUs and GPUs are doing very well in market, putting us on track to increase profitability, grow revenue and expand margin for the second straight year. We see significant opportunities to build on this momentum as we transition to our next generations of high-performance products and launch the industry's first 7-nanometer x86 CPUs and discrete GPUs over the coming quarters. Demand for our high-performance computing offerings remains strong, and our product portfolio and competitive positioning are getting stronger. We remain focused on executing our strategy and delivering our leadership product road map.
Now I would like to turn the call over to Devinder to provide some additional color on our third quarter financial performance. Devinder?