I remember Theo De Raadt pointing out several design errors in x86 chips that could be used as attack vectors. I am not sure how many of those SPARCs or Itaniums have.
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Different x86 microarchitectures have had errata (such as TLB consistency) that, if you're a kernel VM developer, can bite you in the ass. That's annoying, but it's not an intrinsic flaw in the x86 architecture, and it is not as if there are latent x86 vulnerabilities lying around waiting to be exploited.
On the other hand, at least two times now, Sun managed to screw up floating point in a way that compromised security. For instance:
http://www.matasano.com/log/222/this-old-vulnerability-umulu...