I was running some tests on my memory today and ran into a rather disturbing issue. I had one stick of the Patriot RAM in the first black channel slot and was using memtest86+ 4.0 and got to about 30 errors in the first minute of testing before it locked up. (Oddly I was able to boot up into windows with it not bluescreening me). Then I tested the same RAM in the first gray channel, then the 2nd black channel. Memtest passed all tests on each of those slots. So, what I've got here is a motherboard issue after all it seems. I was testing at the settings VistaHead recommended, except I turned down the FSB and MEM Mhz to 1600, tRAS at 22, memory voltage at 1.9, SPP voltage 1.4, MCP voltage 1.6.
Now that I know I've got an issue with the motherboard, what is the procedure to RMA it? Assuming that's possible. I bought it on 11/25/08...

With the memtest from that link I'm running into a situation where one of the sticks is passing and the other is not, so I'm sending them back for replacement. Will update once I get new ones.

Yeah might be a bad DIMM slot & not the memory...

i am having a C1 issue also, but mine is more of a RANDOM issue, so its a bit harder to pin down. i have 6 gig (3 2gig modules) of corsair xms3 (cm3x2g1333c9) if i need to do a restart or if i turn my pc on after only being off for a little while, i get the C1 error at boot. no post. i have to turn off the psu and unplug it and drain residual puwer from the mobo before i can post. sometimes i have to do it 2-3 times, so you can see how aggrevating this can get. this has been an on going issue from the day i built this. here is some of the tech support file from the nvidia cp: and just an fyi: i have fiddled with the ram voltage up to 1.7 volts to no avail
Number of Processors = 2
========== CPUID Info ==========
Processor 0:
Brand = Intel(R) Core(TM)2 CPU          6400  @ 2.13GHz
Family = 6
Model = 15
Stepping = 2
 
 L1 Instr Cache Size = 32768
 L1 Data Cache Size = 32768
 L2 Cache Size = 2097152
 L3 Cache Size = 0
 
========== CPUID Info ==========
Processor 1:
Brand = Intel(R) Core(TM)2 CPU          6400  @ 2.13GHz
Family = 6
Model = 15
Stepping = 2
 
 L1 Instr Cache Size = 32768
 L1 Data Cache Size = 32768
 L2 Cache Size = 2097152
 L3 Cache Size = 0
 
 
========== Operating System Information ==========
Windows 7 Ultimate 64 bit
Microsoft  , Build 7100
========== Motherboard Information ==========
Motherboard Vendor: NVIDIA
Motherboard Version: 2.0
Motherboard Model: C73M55XECRB
========== DirectX version Information ==========
DirectX 10.0 (6.1.7100.0)
========== Driver Version Information ==========
Nforce Driver Package version Not reported
Audio Driver  Not reported
Graphics Driver  191.07 (8.16.11.9107)
Ethernet Driver  Not reported
IDE Driver  11.1.0.33
nTune 6.05.13
========== Processor, Bus, and Memory Speed Information ==========
CPU Speed = 2133.833
CPU Multiplier = 8.000  
FSB Frequency = 267
Memory Frequency = 1335.000
PCIE Frequency = 5000
tRas = 24
tRcd = 9
tRp = 9
tRc = 34
tWr = 12
tRrd = 5
tRwt = 15
tWtr = 16
tWrwr = 6
tRdrd = 8
tFAW = 26
========== GeForce Information ==========
GPU 1: GeForce GTX 280
GPU 1 Video BIOS version: 62.00.0e.00.0f
GPU 2: GeForce GTX 275
GPU 2 Video BIOS version: 62.00.60.00.03
========== GPU's Core and Memory Speed Information ==========
GPU Core Speed = 615
GPU Memory Speed = 1107
GPU Shader Clock Speed = 1350
GPU Core Speed = 633
GPU Memory Speed = 1134
GPU Shader Clock Speed = 1404
========== System Voltage Information ==========
CPU Voltage = 1.160   v
nForce MCP Voltage = 1.500   v
nForce SPP = 1.300   v
Memory Voltage = 1.500   v
FSB CPU <-> SPP  Voltage = 1.200   v
CPU Core0 GTL Vref boost = 0.000   v
CPU Core1 GTL Vref boost = 0.000   v
========== Processor and System's Temperature Information ==========
CPU Temperature = 41 C
System Temperature = 29 C
GPU 0 Temperature = 50 C
GPU 1 Temperature = 41 C
========== Memory SPD Information ==========
Memory Dimm 0 (0x50)
Memory type:   DDR3 SDRAM
Error correction:   NONE
Voltage interface level:  HSTL (1.5V)
Data width:   64 bits
Number of physical banks:  2 (double sided)
Number of logical banks:  8
Number of row addresses:  14       14
Number of col addresses:  10       10
Bank density:   1024     1024 MB
Primary RAM Width:  8        8 bits
Error checking RAM Width:  0        0 bits
Self-refresh:   No
CAS 7.0:  
Min row precharge time (tRP): 13.500   ns
Min row active delay (tRRD):  7.500    ns
Min RAS to CAS delay (tRCD): 13.500   ns
Int Wr to Rd Cmd Dly (tWTR)  7.500    ns
Int Rd to Pchg Cmd Dly (tRTP) 7.500    ns
Min Act/Auto-Rfrsh Time (tRC) 50.625   ns
     UDIMM (module width = 133.35mm)
Manufacturer's JEDEC ID code: 0000009e 00000002
Module manufacturing location: 1 (manufacture dependant)
Module part number:  CM3X2G1333C9     
Module revision code:  0 (manufacture dependant)
Module manufacturing date:  Not reported
Module serial number:  00000000
SPD revision:   1.1
Memory Dimm 1 (0x51)
Memory type:   DDR3 SDRAM
Error correction:   NONE
Voltage interface level:  HSTL (1.5V)
Data width:   64 bits
Number of physical banks:  2 (double sided)
Number of logical banks:  8
Number of row addresses:  14       14
Number of col addresses:  10       10
Bank density:   1024     1024 MB
Primary RAM Width:  8        8 bits
Error checking RAM Width:  0        0 bits
Self-refresh:   No
CAS 7.0:  
Min row precharge time (tRP): 13.500   ns
Min row active delay (tRRD):  7.500    ns
Min RAS to CAS delay (tRCD): 13.500   ns
Int Wr to Rd Cmd Dly (tWTR)  7.500    ns
Int Rd to Pchg Cmd Dly (tRTP) 7.500    ns
Min Act/Auto-Rfrsh Time (tRC) 50.625   ns
     UDIMM (module width = 133.35mm)
Manufacturer's JEDEC ID code: 0000009e 00000002
Module manufacturing location: 1 (manufacture dependant)
Module part number:  CM3X2G1333C9     
Module revision code:  0 (manufacture dependant)
Module manufacturing date:  Not reported
Module serial number:  00000000
SPD revision:   1.1
Memory Dimm 2 (0x52)
Memory type:   DDR3 SDRAM
Error correction:   NONE
Voltage interface level:  HSTL (1.5V)
Data width:   64 bits
Number of physical banks:  2 (double sided)
Number of logical banks:  8
Number of row addresses:  14       14
Number of col addresses:  10       10
Bank density:   1024     1024 MB
Primary RAM Width:  8        8 bits
Error checking RAM Width:  0        0 bits
Self-refresh:   No
CAS 7.0:  
Min row precharge time (tRP): 13.500   ns
Min row active delay (tRRD):  7.500    ns
Min RAS to CAS delay (tRCD): 13.500   ns
Int Wr to Rd Cmd Dly (tWTR)  7.500    ns
Int Rd to Pchg Cmd Dly (tRTP) 7.500    ns
Min Act/Auto-Rfrsh Time (tRC) 50.625   ns
     UDIMM (module width = 133.35mm)
Manufacturer's JEDEC ID code: 0000009e 00000002
Module manufacturing location: 1 (manufacture dependant)
Module part number:  CM3X2G1333C9     
Module revision code:  0 (manufacture dependant)
Module manufacturing date:  Not reported
Module serial number:  00000000
SPD revision:   1.1
 

bicycledr4376

sorry, forgot to post that i have done memtest and all checked out fine. all 3 modules seem to have no problems.

First off, you should have started your own thread, and not hijacked this one.  Having said that.....
Is that triple channel or dual channel RAM?  I have not looked it up, but if you are running 3 X 2GB, that tells me that it is probably triple channel.  The 790i series board uses DDR3 dual channel memory.  Can you run triple channel memory?..sort of...you will probably only be able to run two sticks (4GB) of the RAM, and the timings will not be what the manufacturer's specifications are...in other words, if you are able to get it to run and be stable, you are going to have to tweak the hell out of the board's memory settings.

bicycledr4376

sorry 'bout that. i dont usually post in forums so im kinda new to how they work. didn't mean to step on any toes here.according to corsair, the ram i have is dual channel ddr-3 pc3-10666. tested latency; 9-9-9-24 @ 1.5 volts

Please post the RAM part number or better yet a link to a vendor that lists the specs.

Is this the 6GB kit that you have in the below link?  If so, it is triple channel...look under specifications.  The link that you provided gave no specs, and it is for the 4GB set.    In most cases 6GB of RAM sold as a set of 3 X 2GB is going to be triple channel memory.
http://www.newegg.com/Pro...S+Series%29-_-20145220

Is that your RAM in the Newegg link?  The confusion is that the 4GB set is dual channel, the 6GB set is triple channel.  So, did you purchase a 4GB set and a 2GB set, or one 6GB set?  After you get your new RAM start a new thread and fill out a BIOS template, list all of your hardware to include RAM and model/part number.  You can come back to this thread and cut and paste the BIOS template I provided the OP here in the beginning of the thread.

I love these forums. just had a mobo error code C1, and read all these posts I could find. Then I removed my memory sticks (Corsair XMS 1600) two at 1Gig ea. and blew on them like we use to to our old game decks and cartridges, reinserted them and all is fine. EVGA thank you so much for these forums.