In our test of the Intel Core 2 Extreme QX9650, we said that this processor isn’t currently compatible with nForce 680i motherboards given our futile
attempts with eVGA and ASUSTeK models. While at the time it seemed to be still question of a bios which could have resolved this problem, it now appears there is no such luck.
In fact, eVGA has officially indicated that its nForce 680i motherboard is limited to support of Intel 45nm dual core CPUs, the Wofldale, while quad core versions, the Yorkfield, will lack support due to hardware limitations.
As for ASUSTeK, they updated their compatibility list in order to distinguish dual and quad core compatibility and nForce 6xx motherboards are now marked down as incompatible with quad cores. Also, strangely enough ASUS already mentions two nForce 7xx mobos as incompatible. This chipset has not yet been released and was officially delayed for problems totally unrelated to compatibility ; however, in actuality this is probably the reason.
So here is some bad news for nForce 680i motherboard owners. Even if we don’t know if the fault lies with Nvidia or Intel, the result is very disappointing.