At default speeds, an Opteron 148 and Athlon 64 FX-51 will perform exactly the same - both processors' are Socket 940, clocked at 2.2GHz with a 1MB L2-cache and feature a 128-bit 'dual-channel' memory-controller.
The only difference is that the Athlon 64 FX has full unlocked multipliers, allowing for easier and more flexible overclocking.
Also, the Opteron 148 features three Hypertransport-links(non-coherent, i.e. CAN'T be used for multiprocessing) while the Athlon 64 FX has only one Hypertransport I/O-link(non-coherent) - this is more of a theoretical advantage, tho, as there are currently no motherboards that would use more than one Hypertransport I/O link, if i recall correctly.
Hyper
transport should not be confused with Hyper
threading....unfortunately, both technologies share the same acronym 'HT'.
Hypertransport is a fast, packet-based point-to-point interconnect which connects the CPU to the rest of the system - basically, it replaces the 'classical' FSB on the Athlon 64-platform.
The Opteron 2xx and 8xx series have additional Hypertransport-links for communication between multiple CPUs.
Go
here' ">http://www.hypertransport.org/faqs.html#b for more info about Hypertransport
Hyperthreading enables a single CPU to act as two 'virtual'(or 'logical'
CPUs.
It will only offer improved performance if your applications are specifically optimized for Hyperthreading, otherwise there will be little to no benefits - in some cases, you'll actually get slightly less performance when running non-optimized apps.
More info
here' ">http://www.arstechnica.com/pae.../hyperthreading-1.html
AMD's CPUs currently do NOT support Hyperthreading.
-------------------------
The opinions expressed above do not represent those of Advanced Micro Devices or any of their affiliates.
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07/15/2004 01:49 AM
