If you have the recommended PSU & have all the power connections connected and still cannot get the board to overclock then I suggest you fllash to beta bios 02/17 or 02/18. I've hosted them here:
http://webpages.charter.net/timonex/nf4ld217.rar
http://webpages.charter.net/timonex/nf4ld218.rar
Please note the files are in .rar format and must be extracted prior to flashing. I suggest you use winrar and test the files prior to extracting & flashing to ensure data integrity.
If you cannot get into windows to use winflash then either place the *.bin file together with awdflash.exe on a clean boot floppy or CD. Boot from the floppy or CD you created and type:
awdflash /cc /cp <biosfile.bin>
If you're using a bootable CD(preferred) then do not try to save the old file, as you'll encounter write errors. When finished flashing restart the system, enter bios, select load optimized defaults, save & exit, then get into the bios and change the necessary settings. If you notice any odd behavior in the bios or data corruption, I suggest you shut the system down and reset the CMOS jumper for a minimum of 30 seconds. There are well written instructions on resetting the CMOS on DFI boards located here:
http://www.ocforums.com/showthread.php?t=325031
There is also a good deal of information about setting this board up located in my thread here:
http://www.ocforums.com/showthread.php?t=365248&page=1
Suggested PERFORMANCE memory timings for OCZ VX/winbond UTT are:
Ratio 200(1:1)
CPC Enable
CAS 1.5
TRCD 2
TRAS 0
TRP 2
TRC 7
TRFC 15
TRRD 1
TWR 2
TWTR 1
TRTW 1
TREF 3120
TWCL 1
INTERLEAVE Enabled
DQS Skew Increase
DQS Skew V 0
Dram Drive Str 6
Dram Data 4
Max Async 6.0ns
Read Preamble 5.0ns
Idle Cycle Counter Enable
R/W Bypass 16x
Bypass Max 7x
32Byte Granularity Disable(8 Bursts)
If these settings do not work then try
2-2-2-8
TRC = 9
TRFC =17
TREF = 0648
TWTR = 02
TRTW = 02
Max Async = 7.0ns
Read Preamble = 6.5ns
Idle Cycle Counter = Disable
If you get a floppy boot error and long beeps then you likely have a memory setting problem and I've found holding the <insert> key while powering up to be effective at putting the system into "safe" boot mode. There is also the safe boot jumper. If all else fails reset the CMOS as per the previous instructions.