Remember that the Athlon 64 processor has an on-die(i.e. it's integrated right into the processor itself) Memory-controller.
Consequently, it depends on the processor
itself, NOT the motherboard what type or configuration, i.e. 64 or 128-bit(or single channel/'dual-channel' if you prefer) of memory is supported - on an Athlon 64-platform, the motherboard or chipset is completely irrelevant regarding this question.
Like Ardrid said, ALL Socket 754 processors(including mobile parts and Socket 754 Semprons) have a 64-bit, single-channel memory-controller.
A 128-bit, 'dual-channel' memory-controller is available on Socket 939(Athlon 64/Athlon 64 FX) and Socket 940(Athlon 64 FX/Opteron) processors - Socket 940 processors require registered
Refer to the Athlon 64 Product datasheet
' ">http://www.amd.com/us-en/asset...nd_tech_docs/24659.PDF for a quick overview or the Functional datasheet
' ">http://www.amd.com/us-en/asset...nd_tech_docs/31410.pdf for the 754-pin package, section 2.4.2, for more detailed info
The opinions expressed above do not represent those of Advanced Micro Devices or any of their affiliates.
AMD Athlon 64 X2 6000+ 89W :: Asus M2N32SLI Deluxe :: 2x1024MB Muskin XP2-6400 DDR2-800 :: BeQuiet! Darkpower Pro 530W :: 2x WD Raptor 74GB/10k rpm, RAID 0 :: ATI Radeon X1950XTX