Thanks, Brian. Q1 was truly an outstanding start to 2018. Our transformation to a data-centric company continues to build momentum.
Revenue was a first quarter record at $16.1 billion, up 13% year over year. Operating income was $4.8 billion, up 21% year over year, and EPS at $0.87 was up 32% year over year. From a capital allocation perspective, we generated $6.3 billion of cash flow from operations and returned $3.3 billion to shareholders in the form of buybacks and dividends. As a result of the strength we are seeing in the business, we are raising our full-year revenue guide by $2.5 billion to $67.5 billion. We're raising our EPS guide by $0.30 to $3.85, and we're raising our free cash flow guide by $1.5 billion to $14.5 billion.
Our Q1 results demonstrated continued momentum in our transformation from a PC-centric company to a data-centric company. Intel's data-centric businesses were up 25% collectively, with each business individually growing double digits. Our data-centric businesses are now approaching 50% of our revenue, an all-time high. Our PC-centric business was up 3% on strength in notebook, desktop, and modem. DCG's strong cash flows fund Intel's investments in new data-centric growth. As a reminder, we adopted a new revenue recognition standard in Q1. The new standard drove $462 million in incremental Q1 revenue recognition. This predominantly affected CCG and NSG. By year end, we expect roughly half of this to net out. Moving to Q1 earnings, we generated significant EPS expansion in the quarter, up 32% year on year.
Our non-GAAP EPS improvement was driven by strong top line growth, a 3-point improvement in operating margins, and an 11-point reduction in our effective tax rate. The 3-point improvement in operating margins were driven by a 4-point reduction in spending, partially offset by a 1-point decline in gross margin. The 1-point decline in gross margin was driven by growth in our adjacencies, which have lower gross margins than our CPU products. From a spending standpoint, versus last year, we delivered $1.3 billion more revenue on $200 million less spending.
As a second reminder, we adopted a new mark-to-market standard for our equity investments. In 2017, all realized gains and losses were recorded in our non-GAAP results. But in 2018, all mark-to-market adjustments flow through earnings. In an effort to eliminate volatility, we have excluded these adjustments from our non-GAAP results. Our Q1 GAAP EPS included approximately $0.13 for mark-to-market gains in our ICAP portfolio that were excluded from our non-GAAP results.
We are also making excellent progress on our operating efficiencies. In January, we pulled in our 30% spending goal from 2020 to 2019, and we're off to a good start in 2018. Total spending was down 4% year over year in the quarter. R&D spending as a percentage of revenue was down approximately 2 points. And our SG&A costs were down over 2 points. Our intensity on spending is designed to accelerate top line growth, and it is paying off. Currently, as a result of strong top line growth, we now expect to meet our 30% spending target in 2018, two years ahead of our original expectations. Let me touch briefly on our Q1 performance by segment. The Data Center Group delivered a great quarter, much better than expected. DCG revenue of $5.2 billion was up 24% year over year, and operating income of $2.6 billion grew 75%. Q1 operating margin was 50%. Overall, unit volume was up 16% and ASPs were up 7%. We saw broad-based demand strength in Q1, with customer preference for high-performance products driving richer ASPs.
Cloud and comm service provider segments were greater than 60% of the data center business. And this was the first quarter our cloud business has surpassed $2 billion in revenue, which made it our largest segment in the first quarter. Additionally, we redefined our expanded TAM for DCG to markets beyond the CPU, like silicon photonics, fabric, network ASICs, and 3D XPoint memory. These adjacent businesses are gaining traction and grew 16% year over year. DCG performance in all segments was better than our January forecast, and we expect that strength to continue to aid DCG momentum through the second quarter. Our additional data-centric businesses, IOTG, NSG, and PSG, are becoming a larger component of our overall business, growing 18% year over year in the quarter. Our Internet of Things business achieved revenue of $840 million, growing 17% year over year, driven by strength in video and continued momentum in retail. Operating profit was $227 million, up 116% year over year, on higher revenue and lower spending, as we shifted our ADAS investments to Mobileye.
As you heard from Brian, the Mobileye business is going strong. Q1 revenue was $151 million. And while it's early in the journey, we are on track to our deal thesis. Our memory business broke $1 billion in quarterly revenue for the first time, up 20% year over year, with strong demand for data center SSD solutions.
We reduced our operating losses by $48 million, with strong gigabyte demand and unit cost reductions more than offsetting ASP reductions. The transition to 64L 3D NAND is improving our cost while we invest in and expand our Dalian factory. We expect the second half of 2018 to be balanced between supply and demand, and we continue to expect this segment to be profitable for the full year of 2018. The Programmable Solutions Group had revenue of $498 million, with 17% growth, driven by strength in data center and the embedded segments. Operating profit was $97 million, up 5% year over year.
The PSG team continues to perform and execute well. Our advanced FPGA products, those at 28, 20, and 14-nanometer, grew over 40% in the quarter. In fact, PSG won more customer designs in Q1 than in any prior quarter. Finally, the Client Computing Group had another strong quarter. Revenues of $8.2 billion were up 3%, and operating margins were down 4 points due to 10-nanometer transition costs and growth in our modem business. Our PC-centric business continues to perform well in a challenging but improving market and serves as a significant source of cash flow for the company. We saw strength in the commercial and gaming businesses, and we believe the worldwide PC supply chain is operating at healthy levels. We've laid out our capital allocation priorities: invest organically; expand acquisitively; and return capital to our shareholders and do it wisely. We continued to execute to these priorities.
We generated $6.3 billion in cash from operations. This included $1.7 billion in cash received from NAND customer supply agreements. We invested $2.9 billion in CapEx and delivered $3.4 billion in free cash flow, up 73% year over year. We returned almost 100% of free cash flow to our shareholders in the form of $1.9 billion in buybacks and $1.4 billion in dividends, a 10% increase per share over last year. Now moving to our full-year outlook, our strategy is working and our investments are paying off. We are now forecasting the midpoint of the revenue range at $67.5 billion, up $2.5 billion versus our expectations in January.
We expect operating margin of approximately 31%, up 1 point from January, as spending as a percent of revenue drops to approximately 30%. Versus prior estimates, gross margin will be approximately flat, as broad-based strength in our business is offset by the higher costs associated with the 10-nanometer volume production shift to 2019. We now expect a full-year tax rate of 13%, 1 point down versus our prior estimates. Overall, stronger top line growth, improved operating margins, and a lower tax rate will boost EPS to $3.85, up $0.30 versus prior estimates.
From a cash flow perspective, we are increasing our free cash flow to $14.5 billion, up $1.5 billion from January. We now expect net capital deployed of approximately $12.5 billion, up $500 million versus the expectations we set in January. This reflects gross CapEx of approximately $14.5 billion, offset by approximately $2 billion of customer prepayments for memory supply agreements. In Q2, we expect strong growth to continue. We are forecasting the midpoint of the revenue range at $16.3 billion, up 10% year over year. We expect operating margin of approximately 30%, up 1 point versus last year, which reflects approximately 1.5-point decrease in gross margin and a 2.5 to 3-point decline in spending. We expect EPS of $0.85, up 31%, excluding equity adjustments, from strong top line growth, spending reductions, and a lower tax rate. To sum it up, we believe 2018 will be another record year for Intel. We've met and exceeded our financial commitments, and we feel great about where we are relative to our 3-year plan. Our PC-centric team keeps winning in a challenging market and our data-centric businesses are growing fast, fueling Intel's transformation to a company that powers the cloud and smart connected devices. With that, let me turn it over to Mark, and we'll get to your questions.