Phenom processors B3 stepping will appear in sale during April- May, they will no longer suffer from TLB problem (AMD released a bios patch for B2 processor witch reduced the performance by 10% in application working with memory). Unfortunately, only some motherboard producers left the option ( enable / disable) TLB patch ,The  rest just injected TLB protection in new BIOS versions .
With the reference to information obtained from AMD, soon all motherboards will obtain BIOS update, witch allow to disable protection from TLB error . At present motherboard on base of chipset AMD 690G do not support overDrive utility , and users can't just disable TLB patch. The Updated bios versions will allow this possibility to the owners of these motherboards.
Here is the list of motherboard, officially recommended by AMD for use with phenom processors  . This list will be constantly enlarged, since compatibility checking does not cease.
1)-Asus M3A32-MVP deluxe (AMD 790FX)
2)-Asus Crosshair (NVIDIA nForce® 590 SLI)
3)-Asus M2A-VM (AMD 690G)
4)-Asus M2N-SLI Deluxe (NVIDIA nForce® 570 SLI)
5)-MSI K9A2 Platinum (MS-7376) (AMD 790FX)
6)-MSI K9A2 CF (MS-7388) (MSI K9A2 CF (MS-7388)
7)-MSI K9N Neo-F V3 (NVIDIA nForce 560)
8)-Gigabyte GA-MA790FX-DQ6 (AMD 790FX)
9)-Gigabyte GA-M61VME-S2 (NVIDIA GeForce 6100)
10)-Gigabyte GA-MA69GM-S2H (AMD 690G)
11)-ECS RX780M-A(A770M-A) (AMD 770)
12)-ECS nForce 6M-A (NVIDIA nForce 520LE)
13)-ECS AMD690VM-M2 (AMD 690V)
14)-Jetway M2A780X(PA77GTA) (AMD 770)
15)-Biostar TA770 A2+ (AMD 770)