GA-X48-DS5 with OCZ2RPR10664GK only in Single channel WHY

[Redneck1980]

My specs

CPU: QX9650 C1 @ 4.0GHz, 333 x 12
CPU Cooler: Thermalright True 120 Black
RAM:OCZ Reaper 1066, 4GB OCZ2RPR10664GK @1066, 5.5.5.15, 2.2v
Video: PowerColor 4890PCS+@ 970 & 1120 in CF
MB:GA-X48-DS5 rev1 ( Gigabyte )Bios F7
HDD: WD 500Gb in Raid 0
PSU: CM Silent Pro 850 watt
DVD: Pioneer DL sata
Case: HAF 922 Moded with 3x 200mm RED led fans 1x 120 rear fan
OS:Windows 7 64 Bit

MB Intelligent Tweaker(M.I.T.)
Robust Graphics Booster .................: [Auto]
CPU Clock Ratio .........................: 12
Fine CPU Clock Ratio.....................: 0.0
CPU Frequency ...........................: 4000Mhz


Clock Chip Control
Standard Clock Control
CPU Host Clock Control...................: [Disabled]
CPU Host Frequency (Mhz) ................: 333Mhz
PCI Express Frequency (Mhz) .............: Auto
C.I.A.2 .................................: [Disabled]

DRAM Performance Control
Performance Enhance......................: [STANDARD]
System Memory Multiplier ................: 3.20B
Memory Frequency (Mhz) ..................: 1066
DRAM Timing Selectable ..................: [Manual]

Standard Timing Control
CAS Latency Time.........................: 5
tRCD ....................................: 5
tRP'.....................................: 5
tRAS.....................................: 15

Advanced Timing Control
tRRD.....................................: [Auto]
tWTR.....................................: [Auto]
tWR......................................: [Auto]
tRFC.....................................: 56
tRTP.....................................: [Auto]
Command Rate (CMD) ......................: 2T

Clock Driving & Skew Control
CPU/PCIEX clock control...............800mV
CPU Clock Skew ......................: Normal
MCH Clock Skew ......................: Normal

System Voltage Control...................[Manual]
CPU Vcore..............[1.25v]...........: 1.36875V
DDR2 Overvoltage........................:+0.40......... 2.2v
PCI-E Overvoltage........................:[Normal]
MCH Core.................................: +0.15V
FSB..........................................:+0.1 V


My issue is, when I try to run my sytem in Dual Channel config by installing RAM into DIMMS 1&3, 2&4 & 1&4 to get dual working my games CTD. If I run 3D Mark 06 or Vantage all is good with no crashes.
Why is this only with games, to over come this issue I have to run in Single Channel Dimms 1&2 or 3&4 to get my 4gb of 1066 Reapers to work without a hitch.

I have tried to run them in dual at 800Mhz with no success.

I have tried formatting system with no success.

Even tried all my stock setting SO NO O.C with no success.

If anymore info is required please ask. This has been an issue since I built the system.

I have seen on other forums that I'm not the only one with this issue.

Is anyone able to think of any solutions would be a great help.

 

[redduc900]

With the modules in a dual channel config., is it either Prime blend or Memtest86+ stable at DDR2-1066?

 

[Redneck1980]

I have my system for the first time running in dual channel for the first time with no glitches. The thing that i have changed is the Volts on my ram & the timming, Volts are now 2.27 (CPUID) was running from bios at +0.40 am now +0.45 with 6.6.6.18 timming will try 5.5.5.18 later. Is this Voltage ok for my ram, tRFC at 60 & CR forced to T2. Also still at 1066mhz

The games i was testing on was BFBC2, OFP2, L4D2, & CODWAW, all of these games crashed after a few mintes. But 3DMark06 & Vantage ran without a hitch.

Any ideas what the issue was or is????

I thought it was a WIN 7 64 Bit issue????

Also Prime & memtest ran without any issues once the OC of 333x12 with the correct Vcore was established.

Prime ran from memory 2days & memtest for about 6 hours.