It looks like (some?) AMD processors might be affected as well: "These vulnerabilities affect many CPUs, including those from AMD, ARM, and Intel, as well as the devices and operating systems running them."[1]
[1] https://security.googleblog.com/2018/01/todays-cpu-vulnerabi...
Another is harder to exploit, and has no known workaround (likely requiring new silicon to fix), and affects basically all micro-architectures in use today, including AMD's x86 silicon.
The third, I know nothing of.
I believe the Intel only issue is called "Meltdown" and the second is called "Spectre"; the attack website [1] has details of both.
"Instead, Meltdown exploits side-channel information available on most modern processors, e.g., modern Intel microarchitectures since 2010 and potentially on other CPUs of other vendors."
But their website faq says[0]: every Intel processor which implements out-of-order execution is potentially affected, which is effectively every processor since 1995 (except Intel Itanium and Intel Atom before 2013). .... Currently, we have only verified Meltdown on Intel processors....