Thanks, Simona. We had an excellent quarter with record revenue in each of our four market platforms. And every measure of profit hit record levels, reflecting the leverage of our model.
Data center revenue of $501 million more than doubled from a year ago and the strong adoption of our Volta platform and early traction with our inferencing portfolio. Q3 revenue reached $2.64 billion, up 32% from a year earlier, up 18% sequentially and well above our outlook of $2.35 billion. From a reporting segment perspective, GPU revenue grew 31% from last year to $2.22 billion. Tegra processor revenue rose 74% to $419 million.
Let's start with our Gaming business. Gaming revenue was $1.56 billion, up 25% year-on-year and up 32% sequentially.
We saw robust demand across all regions and form factors. Our Pascal-based GPUs remained the platform of choice for gamers as evidenced by our strong demand for GeForce GTX 10-Series products. We introduced the GeForce GTX 1070 Ti which became available last week. It complements our strong holiday lineup, ranging from the entry-level GTX 1050 to flagship GTX 1080 Ti. A wave of great titles is arriving for the holidays, driving enthusiasm in the market. We collaborated with Activision to bring Destiny 2 to the PC early in the month. PlayerUnknown's Battlegrounds popularly known as [inaudible], continues to be one of the year's most successful titles. We are closely aligned with PUB G to ensure that GeForce is the best way to play the game, including bringing shadow play highlights to its 20 million players. Last weekend, Call of Duty: World War II had a strong debut. And Star Wars Battlefront 2 will be [inaudible]. E-sports remains one of the most important secular growth drivers in the Gaming market with a fan base that now exceeds 350 million. Last weekend, the League of Legends World Championship was held in Beijing's National Stadium, The Bird's Nest where the 2008 Olympic Games were held. More than 40,000 fans attended live. And online viewers were said to break last year's record of 43 million following in 18 languages. GPU sales also benefited from continued cryptocurrency money. We met some of this demand with a dedicated board in our OEM business and a portion with GeForce GTX boards, though it's difficult to quantify. We remain nimble in our approach to the cryptocurrency market. It is volatile, does not and will not distract us from focusing on our core Gaming market. Lastly, Nintendo Switch console continues to gain momentum since launching in March and also contributed to growth.
Moving to data center; our data center business had an outstanding quarter. Revenue of $501 million more than doubled from last year and rose 20% on the quarter and its strong traction of the new Volta architecture. Shipments of the Tesla V100 GPU began in Q2 and ramped significantly in Q3, driven primarily by demand from cloud service providers and high-performance computing. As we have noted before, Volta delivers 10x the deep learning performance of our Pascal architecture, which has been introduced just a year earlier, far outpacing Moore's Law.
The V100 is being broadly adopted with every major server OEM and cloud provider. In China, Alibaba, Baidu and Tencent announced that they are incorporating V100 in their datacenters and cloud server, service infrastructures. In the U.S., Amazon Web Services announced that V100 inferences are now available in four of its regions. Oracle Cloud has just added Tesla P100 GPUs to its infrastructure offerings and plans to expand to the V100 GPUs. We expect support from V100 from other major cloud providers as well. In addition, all major server OEMs announced support for the V100, [inaudible], Hewlett-Packard Enterprise, IBM and Supermicro are incorporating it in servers. And China's top server OEMs, Huawei, Insper and Lenovo have adopted our HGX server architecture to build a new generation of accelerated datacenters with V100 GPUs.
Our new offerings for the AI inference market are also gaining momentum. The recently launched TensorRT programmable inference acceleration platform opened a new market opportunity for us, improving the performance and reducing the cost of AI inferencing in order — by orders of magnitude compared with CPUs. It supports every major deep learning framework, every network architecture and any level of network complexity. More than 1,200 companies are already using our inference platform, including Amazon, Microsoft, Facebook, Google, Alibaba, Baidu, JD.com, [inaudible], Hi Vision and Tencent. During the quarter, we announced that the NVIDIA GPU Cloud container registry or NGC is now available through Amazon's cloud and will be supported soon by other cloud platforms. NGC helps developers get started with deep learning development through no-cost access to a comprehensive easy-to-use, fully optimized deep learning software stack. It enables instant access to the most widely used GPU-accelerated frameworks. We also continued to see robust growth in our HPC business. Next-generation supercomputers such as the U.S. Department of Energy's CRM Summit Systems expected to come online next year, leverage Volta's industry-leading performance and our pipeline is strong. The past weeks have been exceptionally busy for us. We have hosted five major GPU Technology Conferences in Beijing, Munich, Taipei, Tel Aviv and Washington, with another next month in Tokyo. In a strong indication of the growing importance of GPU-accelerated computing, more than 22,000 developers, data scientists and others will come this year to our GTCs, including the main event in Silicon Valley, that's up 10x in just five years. Other key metrics show similar gains. Over the same period, the number of NVIDIA GPU developers has grown 15x to 645,000; and the number of CUDA downloads this year are up 5x to 1.8 million.
Moving to Professional Visualization; third quarter revenue grew to $239 million, up 15% from a year ago and up 2% sequentially, driven by demand for high-end real-time rendering, simulation and more powerful mobile workstations. The defense and automotive industries grew strongly as the demand for professional VR solutions driven by Quadro P5000 and P6000 GPUs. Among key customers, Audi and BMW are deploying VR in auto showrooms. And the U.S. Army, Navy and Homeland Security are using VR for mission training. Last month, we announced early access to NVIDIA Holodeck, the intelligent VR collaboration platform. Holodeck enables designers, developers and their customers to come together virtually from anywhere in the world in a highly realistic, collaborated and physically simulated environment. Future updates will address the growing demand for the development of deep learning techniques and virtual environments. In automotive, revenue grew to $144 million, up 13% year-over-year and up slightly from last quarter. Among key developments this quarter, we announced DRIVE PX Pegasus, the world's first AI computer for enabling Level 5 driverless vehicles. Pegasus will deliver over 320 trillion operations per second, more than 10x its predecessor. It's powered by four high-performance AI processors in a supercomputer that is a size of a license plate. NVIDIA DRIVE is being used by over 25 companies to develop fully autonomous robotaxis and DRIVE PX Pegasus will become the path to production. It is designed for [inaudible] Certification, the industry's highest safety level and will be available in the second half of 2018. We also introduced the DRIVE Ix SDK for delivering intelligence experiences inside the vehicle. DRIVE Ix provides a platform for car companies to create and always engage AI Co-Pilot. It uses deep learning networks to track head movement and gauge and it will have a conversation with the driver using advanced speech recognition, lip-reading and natural language understanding. We believe this will set the standard for the next generation of infotainment systems, a market that is just beginning to develop. Finally, we announced that DHL, the world's largest mail and package delivery service, and [inaudible], one of the world's leading automotive suppliers, will deploy a test lead of autonomous delivery trucks next year using the NVIDIA DRIVE PX platform. DHL will outfit electric light trucks with the ZF Pro AI self-driving system based on our technology. Now turning to the rest of the income statement; Q3 GAAP gross margins was 59.5% and non-GAAP was 59.7%, both up sequentially and year-over-year, reflecting continued growth in value-added platforms.
GAAP operating expenses were $674 million and non-GAAP operating expenses were $570 million, consistent with our outlook and up 19% year-on-year. Investing in our key market opportunities is essential to our future, including Gaming, AI and self-driving cars. GAAP operating income was a record $895 million, up 40% from a year ago. Non-GAAP operating income was $1.01 billion, up 42% from a year ago. GAAP net income was a record $838 million and EPS was $1.33, up 55% and 60%, respectively, from a year earlier. Non-GAAP net income was $833 million and EPS was $1.33, up 46% and 41%, respectively from a year earlier, reflecting revenue strength as well as gross margin and operating margin expansion.
We've returned $1.16 billion to shareholders so far this fiscal year through a combination of quarterly dividends and share repurchases. We have announced an increase to our quarterly dividend of $0.01 to an annualized $0.60, effective with our Q4 fiscal year '18 dividend. We are also pleased to announce that we intend to return another $1.25 billion to shareholders for fiscal 2019 through quarterly dividends and share repurchases. Our quarterly cash flow from operations reached record levels, surpassing $1 billion for the first time to $1.16 billion. Now turning to the outlook for the fourth quarter of fiscal 2018; we expect revenue to be $2.65 billion plus or minus 2%.
GAAP and non-GAAP gross margins are expected to be 59.7% and 60% respectively, plus or minus 50 basis points. GAAP and non-GAAP operating expenses are expected to be approximately $722 million and $600 million, respectively. GAAP and non-GAAP OI&E are both expected to be nominal. GAAP and non-GAAP tax rates are both expected to be 17.5%, plus or minus 1% excluding discrete items. Other financial details are included in the CFO Commentary and other information available on our website.
We will now open the call for questions. Please limit your question to one. Operator, we will — would you please pool for questions? Thank you