Im having a weird problem that i just came across. When i have my system overclocked to 4.0GHz my Windows 7 only detects 3.99GB usuable RAM and when i have the system on stock Windows 7 detects the full 6GB. Any solutions or ideas would be appreciated.

Heres my template

Mother Board ( EVGA X58 LE )
Bios ( 70 )
CPU ( i7 920 )
CPU Cooler ( Venomous X)
Memory ( 6GB Corsair Dominator DDR3-1600 TR3X6G1600C8D )
PSU ( Corsair HX750 )
GPU ( ASUS 5850 )
Operating System ( Windows 7 Ultimate x64 )

Frequency Control
CPU Clock Ratio ( 20x )
CPU Host Frequency (Mhz) ( 191 )
MCH Strap ( Auto )
CPU Uncore Frequency (Mhz) ( x16 )
CPU Clock Skew ( 0 ps )
Spread Spectrum ( Disabled )
PCIE Frequency (Mhz) ( 100 )
OC Recorvery ( Enabled )
Turbo Performance (Disabled)

Memory Feature
Memory Speed ( Standard )
Memory Control Setting ( Enabled )
Memory Frequency ( 2:8 )
Channel Interleave Setting ( 6 Way )
Rank Interleave Setting ( 4 Way )
Memory Low Gap ( Auto )
tCL Setting ( 8 )
tRCD Setting ( 8 )
tRP Setting ( 8 )
tRAS Setting ( 24 )
tRFC Setting ( 88 )
Command Rate ( 1T )

Voltage Control
EVGA VDroop Control ( Without VDroop )
CPU VCore ( 1.275 )
CPU VTT Voltage ( +100 )
CPU PLL VCore ( 1.2 )
DIMM Voltage ( 1.65 )
DIMM DQ Vref ( +0mV )
QPI PLL VCore ( 1.225 )
IOH VCore ( 1.1 )
IOH/ICH I/O Voltage ( 1.65 )
ICH VCore ( 1.1 )

CPU Feature
Intel SpeedStep ( Disabled )
Turbo Mode Function ( Enabled )
CxE Function ( Disabled )
Execute Disable Bit ( Disabled )
Virtualization Technology ( Disabled )
Intel HT Technology ( Enabled )
Active Processor Cores ( All )
QPI Control Settings ( Enabled )
QPI Link Fast Mode ( Enabled )
QPI Frequency Selection ( 4.800 GT/s )

therapy

I had  this problem..when i updated my bios last week..Same as you stock settings worked..what i did was threw everything back to defult and began redoing my clocks..that fixed it..i was loading my settings thro my saved profiles..try that anyways. load defults and go thro your overclocking again..

I tried re-applying the template above manually and still doesnt work

I f your bios is showing 6gig but os shows 3.99 then check msconfig or memory low gap setting in bios.

Ive tried changing:

Frequency Control
CPU Clock Ratio ( 20x )
CPU Host Frequency (Mhz) ( 191 )
MCH Strap ( 1600MHz)
CPU Uncore Frequency (Mhz) ( x16 )
CPU Clock Skew ( 0 ps )
Spread Spectrum ( Disabled )
PCIE Frequency (Mhz) ( 100 )
OC Recorvery ( Enabled )
Turbo Performance (Disabled)

Memory Feature
Memory Speed ( Standard )
Memory Control Setting ( Enabled )
Memory Frequency ( 2:8 )
Channel Interleave Setting ( 6 Way )
Rank Interleave Setting ( 4 Way )
Memory Low Gap ( Auto )
tCL Setting ( 8 )
tRCD Setting ( 8 )
tRP Setting ( 8 )
tRAS Setting ( 24 )
tRFC Setting ( 88 )
Command Rate ( 1T )

McLaren__F1

Ive tried changing:

Frequency Control
CPU Clock Ratio ( 20x )
CPU Host Frequency (Mhz) ( 191 )
MCH Strap ( 1600MHz)
CPU Uncore Frequency (Mhz) ( x16 )
CPU Clock Skew ( 0 ps )
Spread Spectrum ( Disabled )
PCIE Frequency (Mhz) ( 100 )
OC Recorvery ( Enabled )
Turbo Performance (Disabled)

Memory Feature
Memory Speed ( Standard )
Memory Control Setting ( Enabled )
Memory Frequency ( 2:8 )
Channel Interleave Setting ( 6 Way )
Rank Interleave Setting ( 4 Way )
Memory Low Gap ( Auto )
tCL Setting ( 8 )
tRCD Setting ( 8 )
tRP Setting ( 8 )
tRAS Setting ( 24 )
tRFC Setting ( 88 )
Command Rate ( 1T )

How about voltages?

ShockTheMonky

McLaren__F1

ShockTheMonky

I f your bios is showing 6gig but os shows 3.99 then check msconfig or memory low gap setting in bios.

Where in msconfig? Maximum Memory:? In BIOS the memory low gap setting is on AUTO

Bring up Run, type in msconfig, hit enter.
 
Look under Boot/Advanced Options/Maximum Memory. Make sure boxis unchecked.

Yes all the boxes are unchecked, ive tried checking the Maxmum Memory box and unchecking then reboot same thing. In the Task Manager its not suppose to show "4087" right?

Voltage Control
EVGA VDroop Control ( Without VDroop )
CPU VCore ( 1.275 )
CPU VTT Voltage ( +250 )
CPU PLL VCore ( Auto)
DIMM Voltage ( Auto)
DIMM DQ Vref ( +0mV )
QPI PLL VCore ( 1.1 )
IOH VCore ( 1.1 )
IOH/ICH I/O Voltage ( 1.5 )
ICH VCore ( 1.1 )
 
See if that helps.

How much memory does it show in the bios?

ShockTheMonky

How much memory does it show in the bios?

Where does it show how much Memory is installed in the BIOS?

ShockTheMonky

How much memory does it show in the bios?

It shows the full 6GB in BIOS when its on stock but when i OC, it shows 4GB in the BIOS.

Any ideas? Should i try another BIOS?

That's why I still run revision SZ2Z. It's a prime testimony for not updating your BIOS without a good reason.

I would recommend a BIOS for you if you would tell us your sys, incl exact EVGA board # and CPU.

Oh Xeon, sorry, I don't know about that. Here's what I was going to say:

If you have a 920 or 930 the newer BIOSes just seemed to be more trouble, go with this one:

EVGA X58 Classified (E760/E761/E769) - S61J BIOS Released

But since you have Xeon I just don't know. It's up to you or perhaps someone else could comment about it. If you had a gulftown then you should use the latest.

Well I have just tried with the lastest beta bios (70) and I get some weird results:

blck 133-180 6gb
blck 180-185 2gb
blck 185-205 4gb
blck 210 6gb


vcore 1.375-1.387 without any results
vdimm 1.65-1.7 without any results
vtt +200-300 with no results
Ram speed 1600 2:8 6-7-6-18/7-8-7-20/8-9-8-24
Hpec tried 32 / 64 bits without any results


It seems like the blck is the problem as far as I could try the beta. I reflashed with v 64 and the problem solved like I thougt.

I couldn't boot with the 2:6 ram multiplier and... I could boot with the 2:10 with 6gb.

A lot of combinations....

That's all.