As for the known MotherBoards which have available BIOS updates to Support The X2 CPU's:http://www.anandtech.com/printarticle.aspx?i=2457
Make note of which CPU core you choose, the Manchester Core (3800/4200/4600) have E4 while the Toledo Core (4400/4800_ have E6. But there is also a version of the 3800 which has an E6 Toledo Core.http://www.tomshardware.com/cp...09/c..._athlon-06.html
"Now when you're looking at a core's revision, you need to look at it's full revision designation, not just the last part (i.e. CG, D0, E4, E6).
A revision designation comprises two parts: The prefix, which determines the physical L2-cache size and configuration (single- or dual-core) of the core in question and the suffix which gives you the actual silicon revision - Example:
JH-E6 for 'Toledo' and BH-E4 for 'Manchester'
Also, 'Toledo' will return a different CPUID (00020F32) while 'Manchester' will return CPUID 00020FB1.
Generally, CPUID is a pretty safe way to determine with which physical core you're dealing"http://forums.amd.com/index.ph...pic=...=0entry494517
Without the BIOS update, you will only utilize a single core until updated.
And you can add the GigaByte Ultra 939 to that list, with BIOS v. F9
and the AMD Patch for Windows: (choose X32 or X64 for your OS)http://www.amd.com/us-en/Proce...chni...1_13118,00.html
AMD 64 4400+ X2 Toledo @ 2.44GHz Zalman Kooled / GigaByte K8-NS Ultra 939
OCZ Platinum pc3200-2GB / BFG 6800 GT/OC @ 390/1100 Zalman Kooled
Western Digital IDE/HDD 40GB / Samsung IDE/HDD 80GB / Samsung SATA 160GB
Audigy SB 2ZS / Samsung 930B LCD
3DMark05: 5,732 / 3DMark03: 12,983 / 3DMark01: 23,365