Thanks, Mark. Our results for the quarter were outstanding, marking a record second quarter on our way to what we expect will be a record 2018. Last week we celebrated Intel's 50th year as a company, which is a big deal in an industry that never stops evolving. Even more remarkable is that after five decades in tech, Intel is poised to deliver its third year in a row of record financial performance. We set a course five years ago to transform the company. To do that, we made investments to enhance and extend our core microprocessor business along with a series of bold bets to compete and win in new markets. Our thesis was that Intel is uniquely positioned to capitalize on the world's insatiable need to process, store, and move data. The results have been dramatic.
We are now competing for a $260 billion TAM, the largest in the company's history, and we have lots of room to grow. Just five years ago, roughly a third of our revenue was data-centric. Today, nearly half of our revenue is data-centric and growing at a double-digit rate. Data has never been more pervasive nor more valuable. In fact, 90% of the digital data ever created was generated in just the past two years. But of that data, only 1% has been analyzed, indicating massive untapped potential. I'd like to highlight a few indicators of Intel's accelerating transformation before going into our financial results. First, in our Data Center business, our focus on the cloud, network transformation, and AI and analytics produced outstanding results in a strong demand environment. Customer preference for our highest performance products continued, with Xeon Scalable at nearly 50% of our mix in the second quarter. Cloud revenue grew as service provider CapEx continued to accelerate to meet the explosive demand for digital services, artificial intelligence, and data analytics. Enterprise revenue was driven by a combination of macro strength and companies increasing deployment of hybrid cloud solutions and data-intensive workloads. In the comms service provider segment, we continued to gain share as customers choose to virtualize and transform their networks and prepare for the 5G transition using Intel architecture. Our Programmable Solutions Group also delivered strong results this quarter.
PSG again set a record for design win volume, indicating customers' confidence in our roadmap and growing adoption of FPGAs for workload acceleration from the data center, through the network, and out to the edge. Earlier this month we announced the planned acquisition of eASIC, which will give us a competitive differentiator and another solution to meet customers' diverse time to market, performance, cost, and power needs. We combined Intel and Altera 2.5 years ago, and we expected a key value driver to be the increasing use of FPGAs in the data center. In Q2, PSG's data center business more than doubled for the second consecutive quarter. IoTG set an all-time revenue record, with particular strength in the retail and industrial sectors, as customers look to Intel not only for compute performance, but for solutions that drive business value. We also completed the sale of Wind River, as we continued to redeploy resources to higher growth and return areas. Building on its industry leadership in ADAS and driving the industry toward and autonomous future, Mobileye set another all-time revenue record. Customer momentum continued with several design wins, including a multimillion unit deal with ZF for a large global automaker. We also announced that Baidu has adopted Mobileye's EyeQ-based Surround Computer Vision kit as the preferred vision solution for commercial Apollo Pilot AD [Autonomous Driver] deployments. In both the open source and commercial Apollo programs, Baidu will also integrate Mobileye's Responsibility Sensitive Safety model, an open and transparent model that provides safety assurance for AD decision-making, an industry imperative.
Our memory business also set an all-time revenue record. We are transforming the memory industry with a pair of differentiated platform connected capabilities, high-density floating-gate 3D NAND and high-performance persistent Optane technology. We recently announced that we are in production on the industry's first 4-bits per cell data center NAND PCIe SSDs. At the same time, industry support for Intel Optane DC-persistent memory continues to grow, with technology leaders, including CERN, Google, SAP, and Tencent already announcing plans for future use of the technology. Unlike traditional DRAM, Intel Optane DC-persistent memory will offer the unprecedented combination of high capacity, up to 3 terabytes per socket, along with affordability and persistence. Intel and Micron recently announced that we will develop future generations of 3D Xpoint technology independently to better align the technology to our individual business needs and strategies. We'll continue to jointly manufacture 3D Xpoint at the Intel Micron Flash Technologies fab in Lehi [Utah]. Intel intends to extend its leadership with Intel Optane products based on 3D Xpoint, which combined with our high-density 3D NAND technology, offer the best solution for today's computing and storage needs.
And finally in client computing, our focus on innovation and differentiation in the commercial, enthusiast, and thin-and-light segments is producing results. Overall market conditions also continue to improve, and we now expect modest growth in the PC TAM this year for the first time since 2011. The commercial segment remains strong, as CIOs refreshing aging PC fleets are turning to Intel Core processors, with vPro as the gold standard for performance and manageability. At the same time, consumer interest in gaming and our outright performance leadership are driving strength in the enthusiast segment, producing another outstanding quarter in gaming. These trends reflect the market's demand for our highest performance products, resulting in strong overall product mix in CCG. We also began shipping the 7560 modem, Intel's first CDMA and first multi-SIM-capable modem. Our industry-leading products continue to deliver outstanding results. We have a leadership 14-nanometer product lineup for 2019, and we continue to make progress on 10-nanometer. Yields are improving consistent with the timeline we shared in April, and we expect systems on shelves for the 2019 holiday season. In the second quarter, we announced a CEO change. The board is making good progress determining the best person to be the next CEO of this great company. While there is no timetable, the board is working with a sense of urgency, and the identification of candidates, both internal and external, is well underway. Personally and on behalf of Intel's 100,000-plus employees, I'd like to thank Brian [Krzanich] for his many contributions to the company over his 35-year career. The investments he made set us on a course for transformation. Even more importantly, he developed the right strategy and leadership team to carry that transformation forward while we conduct the CEO search. Our financial results in the second quarter show we're doing just that. Let's turn to the numbers. Revenue of $17 billion was up 15% year over year, marking a second record quarter. We saw strong performance across all of our businesses and record revenue in NSG, IoTG, and Mobileye. Our data-centric businesses were collectively up 26%. Excellent operating margin leverage and a lower tax rate resulted in EPS of $1.04, up 44% year on year, even as we continued to invest for growth.
From a capital allocation perspective, year to date we have generated $6.3 billion of free cash flow, returned $8.6 billion to shareholders, including $2.8 billion in dividends and $5.8 billion in buybacks, repurchasing 117 million shares. As a result of the continued strength we are seeing in the business, we are raising our full-year revenue guide by $2 billion to $69.5 billion. We are also raising our EPS guide by $0.30 versus April to $4.15 and the free cash flow guide by $0.5 billion to $15 billion.
Our leadership products are winning in an expanded TAM, and our data-centric businesses are now almost 50% of our total revenue. Our data-centric businesses had strong quarters, with each business individually growing at a double-digit rate. Our PC-centric business was up 6% on strength in the commercial and enthusiast segments. Q2 was another quarter of significant EPS growth, up 44% year on year, and our operating margin expanded $1.4 billion and 5 points year on year. Our EPS improvement was driven by growing demand for high-performance products in the Data Center and Client businesses, leading to higher volumes and ASPs, strong growth in our adjacent businesses, a lower tax rate, and lower share count as a result of buybacks.
In January we pulled in our 30% spending goal to 2018, a full two years ahead of schedule. We are on track to meet that target, and our operating efficiency continues to improve. We remain extremely diligent in managing spending while prioritizing investments in areas that will accelerate revenue growth, product leadership, artificial intelligence, and autonomous driving. This focused approach is producing results.
Total Q2 spending came in at $5.1 billion, 30% of revenue. Total spending as a percentage of revenue is down 4.6 points year over year in the quarter, while we continued to increase investment in our key priorities. Versus the second quarter of last year, we delivered $2.2 billion more revenue with no incremental spending. Let's talk now about our Q2 performance by segment. The Data Center Group delivered another great double-digit growth quarter, with revenue of $5.5 billion, up 27% year over year, and operating income of $2.7 billion, up 65%. Q2 operating margin was 49%, and we continued to see strong growth in both the cloud and comms service providers segments, which now make up two-thirds of DCG revenue.
Platform unit volume was up 14% and ASPs were up 11%. Non-CPU adjacencies grew 30% over last year, yet another indicator that we are growing share in a larger data-centric TAM. We saw continued broad-based demand strength this quarter, with customer preference for leadership products like Xeon Scalable driving strong mix.
The cloud business, our largest Data Center segment, grew 41% year over year, as hyperscale CapEx expands to handle the explosive need to transmit, store, and analyze data. Our comms service providers segment grew 30% year over year, as customers continue to choose Intel architecture to transform their networks. And our enterprise segment was up 10% year over year against a strong IT spending environment and prioritized investment in hybrid cloud implementations. Our other data-centric businesses, IoTG, NSG, and PSG, also achieved double-digit growth in Q2 and together were up 22% year on year. Our Internet of Things business achieved record volume and record revenue of $880 million, up 22% year over year, driven by strength in retail and industrial, as I mentioned earlier. Operating profit was $243 million, up 75% year over year, on higher revenue and flat spending. We expect the Wind River divestiture, which closed in the second quarter, will have a negative impact to IoT revenue of approximately $150 million in the second half of 2018. Mobileye also had another strong double-digit growth in the quarter, up 37% over last year on increasing ADAS adoption. Our memory business delivered more than $1 billion in revenue for the second quarter in a row, up 23% year over year. Optane gained momentum during the quarter, mostly on client strength, shipping over 1 million client Optane memory modules. We expect the memory segment to have full-year profitability in 2018, as we scale revenue and transition a higher percentage of our output to cost-effective 64-layer 3D NAND. PSG's revenue came in at $517 million, up 18% in Q2, primarily from strength in the data center business. PSG's data center segment was up 140% over last year.
In the advanced products category, our 28-nanometer, 20-nanometer, and 14-nanometer solutions grew 70%. Operating profit was $101 million, up 4% year over year. Finally, the Client Computing Group continued to execute on all fronts with another outstanding quarter, generating $8.7 billion of revenue, up 6%. Operating margin percent was flat year over year, as the customer preference for high-performance products drove a strong mix and higher ASPs, offset by 10-nanometer ramp cost.
DCG continues to be an extremely important source of IP, scale, and cash flow for our company. We are executing to our capital allocation priorities of investing organically, expanding acquisitively, and returning capital to our shareholders. Year to date, we generated $13.7 billion in cash from operations. We invested $7.4 billion in capital expenditures and delivered $6.3 billion in free cash flow, up 61% over the first half of last year. We returned well over 100% of our free cash flow to our shareholders.
Buybacks totaled $5.8 billion, and dividends totaled $2.8 billion. In addition, settlements of our convertible debt reduced fully diluted shares by 12 million. Shifting gears to our full-year outlook, our strategy is working, our products are winning, and our investments in data center growth are paying off. We are now forecasting the midpoint of the revenue range at $69.5 billion, up $2 billion versus our expectations in April. This represents a $4.5 billion increase versus the expectations we set in January. Product innovation, a strong global economy, and U.S. tax reform are spurring CIO investment in IT infrastructure, leading to higher data center demand and a stronger PC TAM. We are seeing demand signals in supply feasibility to deliver on our revised expectations. Our biggest challenge in the second half will be meeting additional demand, and we are working intently with our customers and our factories to be prepared so we are not constraining our customers' growth.
Data Center growth is now expected to be approximately 20%, up from our April guidance of high teens. We now expect operating margin of approximately 32%, an increase of 1 point from April. We remain on track to our 30% spending goal, a full two years ahead of our original target. Gross margin is expected to be up slightly versus our April guidance on broad-based business strength. And we expect a full-year tax rate of roughly 12.5%, down slightly from our prior estimates.
Overall, we expect stronger top line growth, improved operating margins, and stronger demand will boost EPS to $4.15, up $0.30 from our estimate in April. In response to the stronger demand, we are raising gross CapEx $0.5 billion to $15 billion, or $13 billion net of memory prepayments. And we are now expecting free cash flow of $15 billion, up $0.5 billion from April. And we expect free cash flow per share as a percentage of EPS to improve by more than 10 points over last year. We remain intensely focused on closing the gap between free cash flow and EPS and expect to make more progress next year. For Q3, we are forecasting the midpoint of the revenue range at $18.1 billion, up 12% year over year. We expect operating margin of approximately 34%, flat versus last year, which reflects about a 1 point decrease in gross margin and a roughly 1 point decline in spending. We also expect EPS at $1.15, up 31% excluding equity adjustments, from stronger top line growth, spending reductions, and a lower tax rate.
Again, last week we celebrated our 50th anniversary and reflected on the impact Intel and our ecosystem partners have had on the world. It has been nothing short of extraordinary. At the same time, we are even more excited about the role Intel will play in technology's future. We're laser-focused on Intel's opportunity, which is larger than it has ever been. Intel's inventiveness, architectural innovation, manufacturing expertise, and intense drive have allowed the company to create and capitalize on opportunity over the long haul. From the early days of DRAM to the era of the first microprocessors, from one architectural battle to the next, and from the PC to the Internet to the cloud, Intel has grown and thrived. I'm very excited about what lies ahead for the company. With that, let me turn it over to Mark and we'll get to your questions. Thank you.