GhostImage Thank you for you input. I found your links helpful indeed. Some more things for me to try out. More testing.
   I might be wrong but It seams to me that ive seen more people having 12gb in their systems, where were only 6,. or maybe its just me. If any of you guys encounter similar problems please chip in, I would definitely appreciate it. So would many others.

The Great Heist

One of the most irritating problems we ran across during testing was playing “Where’s Waldo” with our memory configurations. Our standard P55 test bed is equipped with 8GB of memory. We started noticing weird memory benchmark results in Everest that just did not make sense as Read/Write rates were up 30% lower than our 4GB setup on the same board or other 8GB configurations. These along with applications like Photoshop CS4 x64 and AutoCad 2010 x64 refusing to recognize up to 4GB of memory had us searching for answers.

A look at the BIOS indicated 8GB was indeed available and applications from Everest to CPU-Z along with the suppliers own tuning tools indicated no problems. So we turned to Performance Monitor in Windows 7 to solve our dilemma. Sure, enough, in every case we would only see 4080MB~4096MB listed as available memory. We dug deeper in Resource Monitor and found that the BIOS hard reserved around 4.1GB of memory and it was not available to the OS. We also ran across the same problem on a few boards with 4GB of memory installed.

There are several reasons for this occurring. The primary reason is that the motherboard supplier did not program the BIOS correctly to automatically remap memory above the 4GB mark. In the AMI BIOS’ utilized by ASUS and ASRock, among others, there is a Memory Remapping option in the BIOS setup screen that needs to be enabled on early BIOS releases. Later BIOS releases automatically enable this feature if more than 4GB of memory is detected at POST. So the recommended solution is to update your BIOS to the latest release if this is a problem in your system.

That said, even after a round of BIOS updates from all the suppliers, we still had this problem occurring, just not as often. It also turns out that high Bclks with 8GB of memory installed will also trigger the problem. Even with memory remapping properly enabled, there is a chance this problem will still occur. Depending on the BIOS, it will simply ignore the additional two channels and continue to POST or it will not POST at all.

This problem depends on a Holy Trinity combination Memory, Motherboard, and Processor quality. If the board does not recognize the memory SPD correctly or if the SPD is wrong, it can happen, but primarily it seems to be processor or motherboard related. On the processor side, it seems especially prevalent with the i5/750 as the IMC tends to have trouble handling high memory clocks above 2100 with 8GB installed, it is not impossible, but our first retail samples are not fairing very well.

Why the i5/750? Mainly because of binning as our 860 would clock up to 2150 before problems arose and the 870 would hit 2200. Of course, this is a rare situation as anyone buying this platform would probably not spend $400 on high-end memory and overclock it at these levels. But, with us trying to find the practical limits on each board, it did cause a headache or two.

The primary problem is with the motherboard design. The majority of the P55 motherboards are built on either a 4-layer or 6-layer design. The 6-layer design has (obviously) to additional layers that can be utilized for electrical routing. On a 4-layer design, Channel A memory signal and clock signal are placed on the top layer and Channel B is placed on the bottom layer. In a 6-layer design, half of Channel A is placed on the top layer and other half on the bottom layer. Half of channel B is placed on inner layer 1 and the other half on inner layer 2. This significantly reduces crosstalk between each data Group. As such, the memory capabilities of the 6-layer board will greatly improve 8GB memory clocking above 2000MHz.

Once again, make sure you are on the latest BIOS and considering the early nature of this platform, stay current with a stable release for the next couple of months as any remaining bugs are squashed.

dragonreef I am having the same "Cold Boot" memory issue. I also have an issue once I am powered up with files becoming corrupt and having to reload them. I have tried several things with no real success. Here is my template. ( I last tried Breaker's setup since our hardware is very close to each others). One thing to note, I have been having this issue since day one of building this rig. I have replaced one set of RAM and the motherboard per OEM (Mushkin) recommendations with the same issue still existing. Thank you for your time.

System
Mother Board ( EVGA X58 Classified E-760 )
CPU ( Intel Core i7 920 )
CPU Cooler ( Zallman CNPS9900 ALED { I even backed off on the tightness to make sure I was not bending the socket} )
Memory ( Mushkin Redline 998691 DDR3 1600 @ 6/7/6/18,1T @ 1.65V )
PSU ( Corsair HX 1000w)
GPUs ( GTX275 and 8800GTS )
Operating System ( Windows 7 64 bit Home )     
Frequency Control
CPU Clock Ratio ( 21X )
CPU Host Frequency (Mhz) (133)
MCH Strap ( auto )
CPU Uncore Frequency (Mhz) ( 2800Mhz { 21X } )
CPU Clock Skew ( 0 ps )
Spread Spectrum ( Disabled )
PCIE Frequency (Mhz) ( 100 )
Turbo Mode     enabled
Memory Feature       
Memory Speed ( Standard )
Memory Control Setting ( Enabled )
Memory Frequency ( 1333Mhz / 2:10 )
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 ( 19 )
tRFC Setting ( 74 )
Command Rate ( 2t )
Voltage Control
EVGA VDroop Control ( With VDroop )
CPU VCore ( 1.3 )
CPU VTT Voltage ( +175 )
CPU PLL VCore ( Auto )
**IOH PLL VCore ( Auto )
DIMM Voltage ( 1.65 )
DIMM DQ Vref ( +0mV )
QPI PLL VCore ( 1.4 )
IOH VCore ( Auto )
IOH/ICH I/O Voltage ( Auto )
CPU Impedance (Auto )
*QPI Signal Compensation ( Auto )
ICH VCore ( Auto )
CPU Feature
Intel SpeedStep ( Disabled )
Turbo Mode Function ( Enabled )
CxE Function ( Disabled )
Execute Disable Bit ( Disabled )
Virtualization Technology ( Disabled )
Intel HT Technology ( Disabled )
Active Processor Cores ( All )
QPI Control Settings ( Enabled )
QPI Link Fast Mode ( Enabled )
QPI Frequency Selection ( 4800 GT/s )
OC Recorvery ( Enabled )

NUGZO Hi raja thanks for your advice and input. I've been running everything stock, including the cpu cooler for the past week. Same pattern for me. At initial install, everything works fine. 1 or 2 days later, i lose memory. I'm  running 9gb now instead of 12gb with the same problem. I just re-seated cpu and swapped the 6gb i took out last week, now im back to a full 9gb. I just set twr to 14 and trfc to 100 and we'll see what happens tomorrow or the next day. Remember i'm at stock settings except for trfc at 100, twr at 14, 2N command rate and dram voltage at 1.64. @ 1066. All 9gb is showing. I can almost gaurantee you that come tuesday i'll be at 9gb installed, 6.99gb usable. I really dont know what to do next, maybe RMA my 950 CPU? I havent tried the Gigabyte UD7 at stock, or with 9gb instead of 12 yet, but i was having the exact same problem/pattern with the Gigabyte and 12gb installed. Maybe i'll order a 920 and see if that helps.