AMD´s 4x4 supports four graphic cards
 

Here is the answer to a big question which has bothered many of our readers. Although 4x4 uses the Opteron processor socket "F", it will not use registered ECC memory. Athlon 64 FX-70/72/74 will ask for regular DDR2 memory modules, with Corsair, Geil and OCZ offering blazingly fast memory for the system. Corsair will get some preference in reviews due to the fact that it sports the so-called "Enhanced Performance Profile", also known as SLI Memory. This was co-developed by Corsair and Nvidia. However, there are now over five different memory manufacturers offering a combined total of 17 different memory kits.

Secondly, it will not only support quad-core Barcelona CPUs, but will support four graphics cards at the same time.

Since the 680a chipset is created from a north bridge and south bridge chipset, there were enough PCIe lanes available to use four PEG (PCI