new phenoms have fixed the tlb issue, read this
Before Phenom's release, it was discovered that a bug in the translation lookaside buffer (otherwise known as a TLB) in AMD's quad-core processors could cause a system lockup in rare circumstances. Phenom is affected by this bug up to and including stepping "B2" and "BA". There are BIOS and software workarounds to prevent this problem from occurring by disabling the TLB, although the workarounds typically employed incur a performance penalty of at least 10%.
This penalty was not accounted for in early pre-release previews of Phenom, so the performance of early Phenoms delivered to customers is expected to be somewhat below the benchmarks in these previews. Processors with the bug fixed have "50" as the last two digits of the model number, for instance 9650, with stepping "B3" was released March 27, 2008.
An AMD subsidiary has released a patch for the Linux Kernel, which it said has received "minimal functional testing", to overcome this bug by software emulation of accessed- and dirty-bits causing little performance loss.
therefore the X3 8650 and 8450 dont have tlb problem
intel is the king but amd is cheaper... that is the reason why i wanted to go for it