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If some of you are not aware, the DFI Nforce 4 Ultra/D/DR SLI models has a jumper setting onboard that allows you to increase the voltage supplied on the Vdimm feed from 3.3 volts to 5 volts. This will give users the option to supply more than 3.2 volts to the ram on their DFI motherboards.
As an example, OCZ VX, Mushkin Redline and other UTT based ram products use this extra voltage to obtain tighter timings with overclocked settings.
I had been having major issues with this board and the 5 volt Vdimm setting, to the point where 1 of my boards has died and is now back with DFI for RMA.
This prompted me to contact DFI technical support in the USA.
I just spoke to Frank Wong at DFI USA about the major problems people are getting with the 5Volt Vdimm jumper setting on these motherboards.
His response was very disturbing.
Mr Wong basically informed me that DFI R&D in Taiwan know about this issue and have been testing this jumper setting with many different major ram modules. He told me that the 5 volt setting is causing and i quote "Major Issues".
Mr Wong went on to say that DFI's R&D in Taiwan recommended to him that the 5 volt jumper be set to the default 3.3 volt setting on the board while the problem exsists.
Mr Wong also said "At this time they do not have a fix for this problem. Our R&D has also found that the Vdimm jumper when set to 5 volts can cause some of the motherboard chipsets to blow"
So there we have it straight from the horses mouth.
If you own 1 of these boards and have the jumper set to 5 volts, DFI Tech support in the USA recommend changing it back to the 3.3 volt setting until DFI R&D in Taiwan can fix the problem.
I would like to thank Mr Frank Wong from DFI USA Technical support for sharing this information with me. This is how a good company should operate "Communication with its users".
So once again thank you Frank, keep up the great work and lets hope DFI come up with a fix soon.
Paul "Topboy" North