PC been freezing for 1 year now.

I understand now what u are saying.

Right now CPUZ is saying that voltage levels under the timing table section in the SPD tab is at 1.50V.

I will not adjust anything else until I hear from you. Thank you!

SPD tab as in Serial Presence Detect , is just reporting to CPUZ, 1.5V Nominal ... lower down under Monitoring/ Hardware monitor (CPUZ TXT file) which is showing the actual voltage, you'll see DRAM 1.84V.

If at 1.5V DRAM says 1.84V, what will it say at 1.45V, if same, leave it at 1.5V manual for now, if it lowers, adjust till you get closer to 1.5V, always adjust + 0.05V at a time (for this test only, other times I even go 0.01V at a time) Looking to get it to read 1.75V for now.

1.5V is the lowest that my BIOS will let me adjust the DRAM..

Updated CPUZ txt file still reads at 1.84V

Can you try the following in the BIOS after you report back the readings I ask you at the end.

System Clocks

PCIe x16 -1 to 3 = 100

SPP MCP Ref Clock, MHz = 100

Above should already be set to Auto and read 100

CPU Spread Spectrum Disabled
PCIe Spread Spectrum Disabled (SPP. MCP)

FSB & Memory Config

SLI-Ready Memory, CPUOC 0%

Memory timing, Optimal (Above setting might not allow you edit Memory timing which is just fine, if allowed, change/ leave to Optimal)

System voltage

Can you post the "Current value" first before changing any of the above. The last four readings I don't need, they are all +00 mv

Current voltage values:

CPU Core = [auto] 1.11v

CPU FSB = [auto] 1.1v

Memory = [1.500v] 1.500v

nforce SPP = [auto] 1.30v

nforce MCP = [auto] 1.500v


GTLVREF lane 0 = -30mv
GTLVREF lane 1 = -30mv
GTLVREF lane 2 = +00mv
GTLVREF lane 3 = +00mv


CHANGES MADE >>>>>>>>>>>>>>>>

CPU spread spectrum changed to [disabled]

PCIe spread spectrum changed to [disabled]

SPP MCP Ref Clock, MHZ = [auto] 200 (200 is the lowest possible value)

PCIe x16 -1 to 3 = [auto] 100 (no changes made)

memory timing = [optimal] (no changes made)

could not find SLI- ready memory, CPUOC 0% setting

I downloaded the manual for your board and using it as reference!

GTLVREF lane 0 = -30mv <=== Good
GTLVREF lane 1 = -30mv <=== Good

SPP MCP Ref Clock, MHz 200 is correct, the manual showed 100 and I copied without thinking considering the time I replied. That is why your settings for the 3 pages would've helped.

Let's leave everything else and see if you have the following in your BIOS:

EPP 2.0 should be in FSB & Memory Config

VDr00p should be in voltage

If you do, what are the values?

I don't like your memory to run any lower than 1.75V.

Could not find VDr00p settings

BIOS states "EPP 2.0 memory - not detected"

Should I adjust my mem voltage to 1.75V manual?

EPP 2.0 is "same as" SLI Ready Memory and would've set all your RAM speed and voltage for you.

DDRIII design promised 1.5V but as always, high performance RAM requirements are different, OCZ reports 1.75V.

OCZ DDR3 PC3-10666 Reaper HPC *EOL

Does EOL stand for End Of Life?!

We have been successful using the "10666" number in the BIOS with some boards, now we have to look for linked and sync options.

I have here a 790i FTW, as you know it is different than yours and since the downloaded manual differs from yours also, I don't know what else to go buy.

Do change the memory, I wonder how the system would perform setting the RAM to 1333MHz and the voltage up to 1.8V if needed, it is a 1333 capable but branded 1066 and it does run at 533MHz (1066MHz) according to CPUZ, I've seen the same RAM at 1333MHz (667) with even lower timing 1.75V

CAS = 6
Trcd = 6
Trp = 6
Tras = 20
Trfc = 72

This is were command rate might like the 2T setting but have seen 1T

If you were to change the RAM to 1333MHz and leave the Memory to optimal, what do you get?

I have another suggestion for later.

So here's what I did

FSB - memory clock mod - [unlinked] (changed from auto so I could change the memory clock settings without disturbing the FSB MHz)

FSB (QDR), MHz - [1333] (unchanged)

MEM (DDR), MHz - [1333] (up from 1066)

Memory voltage - [1.800v] (up from 1.500v)

********** Memory settings ********** (optimal)

TCL - [8] (up from 7)
TRCD - [9] (up from 7)
TRP - [9] (up from 7)
TRAS - [20] (up from 16)
CMD - [1T] (unchanged)

********** Advanced memory settings **********(optimal)

TRRD - [5] (up from 4)
TRC - [33] (up from 27)
TWR - [12] (up from 10)
TWTR - [13] (up from 14)
TFAW - [21] (up from 17)
TREF - [7.7uS] (unchanged)
TRFC - [74] (up from 59)


>>Since my previous changes made yesterday I have not yet to experience any freezes. I try to keep warcraft running to monitor the PC performance under load. So far so good yet It has not been running consistently so it still has a chance to freeze. I will keep you updated if it does freeze

Once you get around it, try LINKED and note the changes, 1333 settings matches your FSB and it is supposed to run at the default 1.75V, only go up in small increments if there are any issues with stability.

At these settings if system is not stable, little boost to the CPU, and the chipset/ bridges might be all it is needed to make it stable.

You can try the OCZ Forums, post your system, mainly motherboard, BIOS version, RAM part number, CPU with mention to "Yorkfield" R0 Stepping and a copy of the latest CPUZ (which will have most of the info) with a bit of history. They are great for suggesting proper settings.

Keep us posted.

EDIT:

If you follow the link I gave to your RAM and click on Specification, OCZ claims the following:

1333MHz DDR3
6-6-6-20 (CAS-TRCD-TRP-TRAS)

Would be a good idea to visit OCZ Memory Support And Motherboard Tuning Forum there are many 790i threads there but none with your exact setup, Core 2 Quad and Win 7 64bit are finicky especially if all sockets are filled with high performance modules!

PC just froze up during gameplay...

I readjusted the clock settings to [linked], however, the only way to adjust the DDR MHz is to increase the FSB MHz, Should I increase the FSB MHz until the DDR MHz matches 1333 MHz?

I also adjusted the mem voltage to 1375v down from 1.80v


EDIT>>>>

Should I manually adjust the memory clock/ voltage settings to 6-6-6-20 @1.75v / 1333MHz?

If not stable, load the defaults, leave everything to Auto and just change your general preferences for now.

FSB should remain at 1333MHz

At this time, with me not having an exact reference to your BIOS screen, best is to try OCZ Forum. You can even step back to where it was running OK before the RAM to 1333MHz, which is preferred but needs other minor adjustments to run stable.

EDIT, if it crashed with slower timing, faster will not be any better, I'm sure you will be able to run FSB and RAM at 1333MHz with proper settings from the OCZ Forum

EDIT 2:

Reading over the thread I noticed you never said if you tried running with 2 modules! The reason I ask is with 8GB if one of the modules is faulty, it might not show right away depending on when the faulty region is accessed, under normal load it might get accessed at times causing problems, heavy load sooner, one way to find out is to check the modules either in pair or a single module at a time with Memtest.

System might boot and load the OS with one faulty module mixed in with another or in your case with 3 others but refuse to boot or load OS alone by itself. This might also explain why running at 1333MHz caused problems … thinking out loud.