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View Full Version : ***DFI NF4 Lanparty CPU Overvolt Survey***


lilkevin715
11-18-2005, 04:23 PM
This survey is optional to XS members, but the more participants there are the better it will be so I can collect more data. Back in this (http://xtremesystems.org/forums/showpost.php?p=777631&postcount=10) post XS member EMC2 (thank you so much EMC2!) provided pictures of where you can measure the actual voltage readings off of the motherboard with a Digital Multimeter. As we all know software voltage measurements usually suck in terms of accuracy so a direct measurement with a digital multimeter is always preferable. His post intrigued me to test the actual CPU voltage with a multimeter and I was suprised at the results. My DFI NF4 Lanparty mobo actually over-volts the CPU voltage from the BIOS voltage setting. I am pondering if it is my mobo that is only affected or it includes others as well; hence the purpose of this survey.

I have included two Microsoft Excel spreadsheets in the Zip file attached to this post. One is a spreadsheet ready for data to be entered (I would print it out) while the other spreadsheet has my results.

If you choose to participate in this survey, please include the following:
1) Your board revision
2) CPU info (please keep CPU speed constant during testing to minimize variables)
3) PSU info (manufacturer, rated wattage, model number, etc.)

lilkevin715
11-18-2005, 04:29 PM
My spreadsheet results are in the above post.

1) Revision A02
2) AMD Opteron 146 0530 CANBE @ 2.85ghz for testing
3) Tagan TG-480-U01 480watt PSU (Topower)

From my results, I input the numbers into my TI-83 graphing calculator and have come up with the following equations for actual CPU Voltage:

Idle:
CPU Voltage = 1.097 X BIOS CPU Voltage setting - .1039
Load:
CPU Voltage = 1.066 X BIOS CPU Voltage setting - .0305

hardnrg
11-18-2005, 05:42 PM
my results:

http://img299.imageshack.us/img299/8324/dfinf4ov3zi.gif (http://imageshack.us)