Based on some Google research I've been doing, today, it looks like the chips that use this "speculative execution" date back to 2001 or possibly earlier. :( So, we're basically all in the cross-hairs of this vulnerability.
So now we can "look forward" to reducing the performance of our 3Ghz CPU's to about 2Ghz, to implement the current fixes... if they are even available for these machines or for WIN XP. :(
Cell phones are also affected... Apple & Droid. This looks like a real "winner" here. :(
As we all know, we wrestle not against flesh and blood... Keep the prayer warriors armed and praying!