Billionaire Warren Buffett has finally found his inner geek.

The notoriously tech-averse investor placed one of his biggest bets yet — on IBM, buying $10.7 billion worth of Big Blue shares, or 5.4 percent. IBM is Buffett’s biggest holding after Coca-Cola.

The CEO of Berkshire Hathaway usually steers clear of anything computer-related, such as Apple or Google, preferring instead industries like railroads, soda and banks.

However, 100-year-old IBM is hardly a flash in the pan, and Buffett told CNBC yesterday that he thinks the company has staying power.

“It’s a company that helps IT departments do their job better,” Buffett said, and just as companies rarely drop auditors or law firms, they don’t change their IT support.

In SEC filings yesterday, Berkshire Hathaway also disclosed positions in Intel and DirecTV.