Linux on Intel vs AMD

Gurus,
Have a question regarding running 64 bit oracle on intel vs amd (RHEL). We are currently running on AMD and have been happy. We are seeing a hardware switch away from amd in my co. Does anyone know if the performance of the Xeon 64bit oracle is on par with AMD. I thought the intel had "extensions" that did not have the same performance in what is seen from amd. We are planning to move to quad core blades for a grid env.
thanks

I don't think the "pureness" of AMD's quad core is an issue. The shared cache in the Intel chips is only an issue if it becomes a problem -and I've not seen that happen. Intel chips scale just fine to the high levels I've needed them (I don't claim that's as high as others might need them to go).
On the other hand, I have seen the integrated memory controller (which makes the AMD chips true NUMA processors) be the source of massive problems for Oracle software (which includes new NUMA-optimised tweaks... and thus a slew of new bugs). In particular, 64-bit Oracle on NUMA AMD chips forgot to cache data in a manner accessible by all CPUs, so performance took a complete dive: it was as though you had a db_cache_size of 0. Then you couldn't lock the SGA into real memory: trying to do so locked up the entire server for minutes at a time.
True enough, those bugs were for AMD chips and Windows 2003, so it might be irrelevant for a Linux deployment, but still: nasty tastes linger.
Personally, unless I was forced to, I wouldn't touch an AMD chip these days. The Core 2 architecture scales and performs much better than anything AMD has got.

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