Despite the fact Llano already has an embedded Northbridge, the motherboards do need some sort of a Southbridge for external connectivity and other controllers. This takes the form of the A75 chipset, also known as the Southbridge or FCH. It connects from the APU's PCI-Express 2.0 bus over four links to the A75 chipset.
The feature set is pretty impressive as up-to six SATA-600 ports are supported with support for RAID 0, 1 and 10. That is alongside 10 USB 2.0 ports, 2 USB 1.1 ports and yes, USB 3.0 leads natively straight out of the A75 chipset as well with four USB 3.0 ports. Obviously the chipset also offers support for the older PCI slot, up-to three of them.
This is all embedded inside the FCH, thus motherboard manufacturers do not have to purchase extra USB 3.0 and SATA controllers, making the bill of materials a chunk smaller and cheaper.
An interesting point with Llano processors is that AMD introduces a new socket - FM1. This was to be expected given that the silicon features both a CPU and GPU. Maintaining AM3+ compatibility couldnt really be expected.
FM1 processors have 905 pins by the way.
Whereas Bulldozer processors will use Socket AM3+, A4, A6 and A8 Llano processors will make use of FM1. Now, it's good to know that all current AMD coolers will fit perfectly onto this new slot. So there is no need to invest in new CPU (APU) coolers.
Above, a block diagram of the A75 chipset features. Quite an extensive list for entry level to mainstream PC products alright.
AMD A6 3500 APU review We look at entry level hardware, for a great deal you get some processor power and actually quite some decent GPU power all harbored inside that processor. We'll go even weirder though, as today we'll be testing a triple core APU, yes that is an APU with three physical CPU cores activated, instead of the four you expected. This three CPU cores product was actually announced back in August already but now finally seems to be available in good volume in the stores, at the nice price of only 70 EUR here in the Netherlands.