The RAM comes in matched and tested pairs...you need to keep those pairs together (in the same colored dimm slots). You also need to run MemTest on each stick individually, to make sure that none are bad.

Please create a signature listing your detailed system spex, including all model numbers. Completely fill out this BIOS Template and make sure to include the values showing next to any settings that are on Auto...and we will see what we can do to help you, Thankx.

BIOS Version: P0[]
**System **
CPU Freq, MHz:[] GHZ []
FSB Reference Clock, MHz:[]
CPU Multiplier: [X]Bus Speed MHz []
PCle x16-1 & 16-2, MHz:  [100]
PCle x16-3, MHz:  [100]
SPPc->MCP Ref Clock, MHz:  [200]
nForce SPP --> nForce MCP:   [5X]
nForce SPP c-- nForce MCP:   [5X]
 
**Spread Spectrum**
CPU Spread Spectrum: [Disabled]
HT Spread Spectrum: [Disabled]
PCle Spread Spectrurn(SPP): [Disabled]
PCle Spread Spectrurn(MCP): [Disabled]
SATA Spread Spectrum: [Disabled]
 
**FSB & Memorv Config**
FSB - Memory Clock Mode:[]
FSB - Memory Ratio: []
FSB (QDR), MHz: []
Actual FSB (QDR), MHz:[]
x MEM (DDR),  MHz:[]
Actual MEM (DDR), MHz:[]
P1: [AUTO]
P2: [AUTO]
 
**Memory Timing Setting**
Memory Timing Setting: [Auto or Manual]
tCL (CAS Latency):[]
tRCD:[]
tRP:[]
tRAS:[]
Command Per Clock: [T]
 
** Advanced Memory Settings **
tRRD: [Auto] []
tRC: [Auto] []
tWR: [Auto] []
tWTR: [Auto] []
tFAW: [Auto] []
tREF: [Auto] []
tRFC: [Auto] []
**System Voltages**
CPU Core: [Auto] []
CPU FSB: [Auto] []
Memory: [Auto] []
nForce SPP:[Auto] []
nForce MCP:[Auto] []
GTLVREF Lane 0: [Auto] [] 
GTLVREF Lane 1: [Auto] []
GTLVREF Lane 2: [Auto] []
GTLVREF Lane 3: [Auto] []
 
**CPU Configuration**
Limit CPUlD Maxval:[Disabled]
Intel Speedstep:[Disabled]
xPPM Mode: [Native]
CPU Thermal Control: [Enabled at least-TM2]
C1E Enhanced Halt State:[Disabled]
Execute Disable Bit: [Enabled]
Virtualization Technology:[Disabled,if you do not use VT]
CPU Core 0: [Enabled]
CPU Core 1: [Enabled]
CPU Core 2: [Enabled]
CPU Core 3: [Enabled]
A smart thing to do would be to print yourself off a copy of the FULL Template and write down ALL of your current settings.
Then, everytime you go back into your BIOS and make changes, document them accordingly...that way you don't have to try to remember what you did.

BIOS Version: P0[S20W?]
**System **
CPU Freq, MHz:[2500] GHZ [?] CURRENTLY RUNNING 2500
FSB Reference Clock, MHz:[1333.3]
CPU Multiplier: [7.5X]Bus Speed MHz []
PCle x16-1 & 16-2, MHz:  [100]
PCle x16-3, MHz:  [100]
SPPc->MCP Ref Clock, MHz:  [200]?
nForce SPP --> nForce MCP:   [5X]? NOT LISTED   LDT FREQUENCY [5X]
nForce SPP c-- nForce MCP:   [5X]? NOT LISTED
 
**Spread Spectrum**
CPU Spread Spectrum: [Disabled]
HT Spread Spectrum: [Disabled]? NOT LISTED
PCle Spread Spectrurn(SPP): [Disabled]? NOT LISTED
PCle Spread Spectrurn(MCP): [Disabled]? NOT LISTED  PCIE [DOWNSPREAD]
SATA Spread Spectrum: [Disabled]                    LDT [DISABLED]
 
**FSB & Memorv Config**
FSB - Memory Clock Mode:[AUTO]
FSB - Memory Ratio: [AUTO]
FSB (QDR), MHz: [AUTO] CURRENT 1333.3
Actual FSB (QDR), MHz:[1333.3]
x MEM (DDR),  MHz:[AUTO]
Actual MEM (DDR), MHz:[800]
P1: [AUTO]? NOT LISTED
P2: [AUTO]? NOT LISTED
 
**Memory Timing Setting**
Memory Timing Setting: [OPTIMAL]
tCL (CAS Latency):[6]
tRCD:[6]
tRP:[6]
tRAS:[18]
Command Per Clock: [2T]
 
** Advanced Memory Settings **
tRRD: [Auto] [3]
tRC: [Auto] [24]
tWR: [Auto] [5]
tWTR: [Auto] [10]
tFAW: [Auto] [?] NOT LISTED
tREF: [Auto] [7.8US]
tRFC: [Auto] [?] NOT LISTED
**System Voltages**
CPU Core: [Auto] [1.22500V]
CPU FSB: [Auto] [1.10V]
Memory: [Auto] [1.90V]
nForce SPP:[Auto] [?] NOT LISTED 
nForce MCP:[Auto] [?] NOT LISTED  NF200 [1.20V]
GTLVREF Lane 0: [Auto] [+.00] 
GTLVREF Lane 1: [Auto] [+.55]
GTLVREF Lane 2: [Auto] [+.00]
GTLVREF Lane 3: [Auto] [+.00]
 
**CPU Configuration**
Limit CPUlD Maxval:[Disabled]
Intel Speedstep:[Disabled]
xPPM Mode: [Native]
CPU Thermal Control: [DISABLED]
C1E Enhanced Halt State:[AUTO]
Execute Disable Bit: [Enabled]
Virtualization Technology:[ENABLED]
CPU Core 0: [Enabled]
CPU Core 1: [Enabled]
CPU Core 2: [Enabled]
CPU Core 3: [Enabled]
 
*SYSTEM SPECS*
Custom Build PC
Western Digital Hardrive - WD5001AALS - 500gig sata
Nvidia 9600 GSO 1536mb - K000-00-000446
TSST CDDVDW TS-H663B SCSI CdRom
Realtek Ethernet
Realtek HD Audio
Intel Core 2 Quad - Q9300 2.5 - EU80580PJ0606M
EVGA 750i SLI Motherboard - RB122YWE173RX
800w APower AK800 Power Supply
8 Gigs Ram -- OCZ SLI Ready - OCZ2N800SR4GK
Cooler Master Hyper N520
Windows 7 OS
 
 
I filled in the blanks and changed the values to represent my bios -- best I could

I have tried it with proper timing settings and voltage, but didnt mess with the spectrurn

havent checked the cpu for problems -- I have tried known good ram in all four slots -- and I still get errors each time.

SteveAle

I have tried it with proper timing settings and voltage, but didnt mess with the spectrurn

steve, the spread spectrum is for spreading the frequency out to protect against emi. keep it disabled for now. if all else fails , try it with stock setting later but i doubt it will help. def get your ram settings off auto and set them up to 5-5-5-15 2t at 2.1 volts. thats a more natural cas setup for a cas5 set of ram. only use 4gb for now in the first two dimm slots. tryin to boot 8gb is gonna make you raise voltages even higher to run all that hardware and were just trying to sort your problems right now. try raising your fsb one notch over the auto setting, and your mcp and spp voltages also. then manually set your cpu voltage for the default ghz of the chip and go one notch higher there too. also, running your ram linked and synced should help also. dont set it to run 800mhz with a 1333 fsb...its just pointless. your not gonna get faster than a 1:1 ratiio anyway! k try that for now and see where that takes ya. report back to us what happens.  \m/

Still sounds like a bad controller.  You should contact EVGA and tell them what you have done and if there is anything else they want you to try before setting up a RMA.  Have you tried a single stick of ram in the closest slot to the CPU?  Does it still fail with the same error?

Also, turn down your CPU vcore voltage.  No need to run a stock setting at such a high voltage.  You should keep it below 1.3625v if possible to keep the CPU in its normal operating voltage range.(0.85v-1.3625)

I would contact EVGA tech support!  888.881.EVGA (3842)

Just my opinion.