History so far:
 
I have recently looking for upgrades for my desktop http://forums.evga.com/tm.aspx?m=978948
Bought a 560Ti as videocard remplacement and 2 kits of Patriot Memory PGS34G1600ELK to sit on 8GB (im not only a gamer but Photoshop and AutoCad user)
 
After researching for 790i + 8GB on this forums i went out and started my tests also following JeffreyHam assistance on this topic http://forums.evga.com/tm.aspx?m=850646 he was helping another user but his problem was just the same as mine.
 
To summarise a bit what i did:

• Ran memtest86+ 4.20 on each stick for at least 8 hours without errors.
• Ran memtest86+ 4.20 on each pair of sticks for at least 8 hours without errors. 

 
Then after that i started to test a pair of memories at 1333 link/sync with the cpu
 
 

BIOS Version: P08
**System **
CPU Freq, MHz: 2666.7 GHZ
FSB Reference Clock, MHz: 1333.3
CPU Multiplier: [8X]
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: [Unlinked]
FSB - Memory Ratio: Auto
FSB (QDR), MHz: [1333]
Actual FSB (QDR), MHz: 1333.3
x MEM (DDR)  MHz: 1333
Actual MEM (DDR), MHz: 1333
P1: [AUTO]
P2: [AUTO]
**Memory Timing Setting**
Memory Timing Setting: [Optimal]
tCL (CAS Latency): 7
tRCD: 9
tRP: 9
tRAS: 25
Command Per Clock: [1T]
** Advanced Memory Settings **
tRRD: [Auto 5]
tRC: [Auto 34]
tWR: [Auto 12]
tWTR: [Auto 17]
tFAW: [Auto 26]
tREF: [Auto 7.7uS]
tRFC: [Auto 74]
**System Voltages**
CPU Core: [Auto 1.20]
CPU FSB: [Auto 1.1v]
Memory: [Auto 1.500v]
nForce SPP: [Auto 1.30]
nForce MCP: [Auto 1.500]
GTLVREF Lane 0: [Auto -30mv]
GTLVREF Lane 1: [Auto +10mv]
GTLVREF Lane 2: [Auto 00mv] 
GTLVREF Lane 3: [Auto 00mv] 
**CPU Configuration**
Limit CPUlD Maxval: Disabled
Intel Speedstep: Disabled
xPPM Mode: [Native]
CPU Thermal Control: [Disabled]
C1E Enhanced Halt State: [Disabled]
Execute Disable Bit: [Disabled]
Virtualization Technology: [Disabled]
CPU Core 0: [Enabled]
CPU Core 1: [Enabled]
CPU Core 2: [Enabled]
CPU Core 3: [Enabled] 

 
No problems so far, i can boot 5 times into BIOS without problems and enter into OS too, seems stable. Yet 8GB wont run with this config, i can boot into OS but i cant get stable.
 
Then went into 1600Mhz with only a pair.
 

BIOS Version: P08
**System **
CPU Freq, MHz: 3200 GHZ
FSB Reference Clock, MHz: 1600
CPU Multiplier: [8X]
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: [Linked]
FSB - Memory Ratio: Sync Mode
FSB (QDR), MHz: [1600]
Actual FSB (QDR), MHz: 1600
x MEM (DDR), MHz: 1600
Actual MEM (DDR), MHz: 1600
P1: [AUTO]
P2: [AUTO]
**Memory Timing Setting**
Memory Timing Setting: [Expert]
tCL (CAS Latency): 9
tRCD: 9
tRP: 9
tRAS: 24
Command Per Clock: [2T]
** Advanced Memory Settings **
tRRD: [Auto 6]
tRC: [Auto 41]
tWR: [Auto 12]
tWTR: [Auto 18]
tFAW: [Auto 31]
tREF: [Manual 7.8uS]
tRFC: [Auto 88]
**System Voltages**
CPU Core: [Auto 1.30]
CPU FSB: [Auto 1.3v]
Memory: [Manual 1.800v]
nForce SPP: [Manual 1.30]
nForce MCP: [Manual 1.500]
GTLVREF Lane 0: [Auto -50mv]
GTLVREF Lane 1: [Auto -50mv]
GTLVREF Lane 2: [Auto 00mv]
GTLVREF Lane 3: [Auto 00mv]
**CPU Configuration**
Limit CPUlD Maxval: Disabled
Intel Speedstep: Disabled
xPPM Mode: [Native]
CPU Thermal Control: [Disabled]
C1E Enhanced Halt State: [Disabled]
Execute Disable Bit: [Disabled]
Virtualization Technology: [Disabled]
CPU Core 0: [Enabled]
CPU Core 1: [Enabled]
CPU Core 2: [Enabled]
CPU Core 3: [Enabled]

 
 
 
System is still stable and im writing this from the same computer, but the issue is that i can not run the 4 sticks @1600 or @1333 stable, i run into BSOD as soon as i enter into Windows or just after.
 
Notes: Setting CPU Core or FSB volt values manually to 1.30 will cause instability, setting then back to AUTO 1.30 would fix the problem, i think that this is caused due Vdroop.
 
Intel Burn Test 2.51 wont pass on 20Pass@Maximum
 
Any help is welcome but if JeffreyHam or VistaHead can help (i have seen that they have a lot of experience with this memory model and 790i) it would be great.
 
Thanks to everyone in advance.  
 

Hi thanks for your reply, im running a Q9450 as shown on my sig.

followed that guide, but didnt help that much, ended with BSOD at windows start and later C1 post code on mobo, returned back to previous settings
 
im able to boot into windows and work normally for a while with this settings:
 
**FSB & Memorv Config**
FSB - Memory Clock Mode: [Linked]
FSB - Memory Ratio: Sync Mode
FSB (QDR), MHz: [1600]
Actual FSB (QDR), MHz: 1600
x MEM (DDR), MHz: 1600
Actual MEM (DDR), MHz: 1600
P1: [AUTO]
P2: [AUTO]
**Memory Timing Setting**
Memory Timing Setting: [Expert]
tCL (CAS Latency): 9
tRCD: 9
tRP: 9
tRAS: 24
Command Per Clock: [2T]
** Advanced Memory Settings **
tRRD: [Auto 6]
tRC: [Auto 41]
tWR: [Auto 12]
tWTR: [Auto 18]
tFAW: [Auto 31]
tREF: [Manual 7.8uS]
tRFC: [Auto 88]
**System Voltages**
CPU Core: [Auto 1.30]
CPU FSB: [Auto 1.3v]
Memory: [Manual 1.800v]
nForce SPP: [Manual 1.30]
nForce MCP: [Manual 1.500]
GTLVREF Lane 0: [Auto -50mv]
GTLVREF Lane 1: [Auto -50mv]
GTLVREF Lane 2: [Auto 00mv]
GTLVREF Lane 3: [Auto 00mv]
 
but apps will crash randomly and system bsod when doing intel burn test (it doesnt bsod -sometimes- but results doesnt match, system is unstable)

JeffreyHam
Hey TPB,
The big problem from what I have found is that most of the 790i Ultra's do not like to run 4 stix of RAM at 1600MHz....possibly a FSB hole at that speed. I run 8GB's of the Patriot model # PVS34G1600LLK and have worked extensively to run 4 stix at 1600MHz and failed.
Using the same exact settings that you have posted above....please remove the two stix from the Gray colored slots and report the results. Thankx.

In post #1, he states that he tried running at 1600Mhz with only two sticks and was successful at doing so.
"Then went into 1600Mhz with only a pair."
(I skipped copying and pasting the settings)....then the following:
"System is still stable and im writing this from the same computer, but the issue is that i can not run the 4 sticks @1600 or @1333 stable, i run into BSOD as soon as i enter into Windows or just after."

Using settings from post #8 gave me BSOD while initializing windows
PAGE_FAULT_IN_NONPAGED_AREA
0x00000050 (0xFFFFF50015BAE4BC, 0x0000000000000001, 0xFFFFFA8008524FD7, 0x0000000000000007)
 
-------
Test#2
 
Tried same settings from post #8 but this time with P1 and P2 on AUTO, managed to get into windows, but system BSOD'ed just after starting IBT
 
-----------
Test #3
 
Tried same settings from post #8 but this time with P1 and P2 on AUTO, and upped CPU Core to 1,356v managed to get into windows, system frozen and then BSOD'ed, after restarting system entered into a loop, it loads beep and then boot codes goes from C1 to 75.. FF and then automatically restarts again in a loop. had to do CLEAR CMOS 
-------------
Returned to settings from post #5 (running the four sticks with those, kinda unstable but yet it wont crash on just windows login, but still it BSOD randomly.)
 
My temps (using Aida64 and RealTemp 3.60 wiyh jTmax 100)
CPU (iddle\load) 51-42-43-42 \ 72-60-62-61 (kinda hot here on south america on this time of the year)
SPP 54
MCP 47
GPU 33
Motherboard 37
 
CPU-Z reads 1.304~1.312 on Vcore
DIMM 1.8040
NB 1.320
 
 
 

MHO is that he is going to have to go to 1800MHz L&S with; at best, 10-10-10-30-2T timings to run 8GB's of that RAM.

The only way to find out if the CPU and cooling system can handle it is to give 'er a shot....it would be worthwhile to try.
 
EDIT: BTW, regarding this setting: tRFC: [Auto 88] (110) .....88 is right on the money for 1600MHz...IMHO...110 would be appropriate for 2000MHz. 1700MHz is also a no go on mine with 8GB's RAM.

IndianScout

no idea if my settings will help you guys at all, I'm on a 750i but here they are with 8g G.Skill 1066

http://i53.tinypic.com/33cpseb.jpg

http://i53.tinypic.com/2r3dz4o.jpg

http://i51.tinypic.com/jrbh46.jpg

http://i52.tinypic.com/iqasjl.jpg

Sorry man.....you have a different board, chip and RAM.....will be of no help at all but, thankx for your effort!!

Tried somethign similar to what you posted JeffreyHam but with multi x7
 

 
I will run an IBT and see what happens, if it fails i will try your settings instead.

JeffreyHam

TPB....I see you are here on your thread. I hope you try those 1800MHz settings and let us know if they worked for you or not. I am going offline for dinner now and I'll check back later on this evening....Good Luck!!

 
Running on your settings atm, it passed 3DMark, now im stressing with IBT, lets see how it goes.
 
CPU is running really hot on IBT, 79-75-71-72
SPP 57
MCP 46
 

Does the CPU hit those temps and then goes back down, or are they consistently in the high 70's when running the test?  Try bumping your memory voltage to 1.90v.

system BSDO while running IBT with MEM@1.9v and settings of post #17

Yes my temps are getting quite high on multi x8 hitting late 70's and (temps on pic are on x7) uppping more the vcore would make them hit the mid 80s
 
Right now with the settings of post #17 im getting:
CPU is running really hot on IBT, 79-75-71-72 / SPP 57 / MCP 46
iddle they go down to 55-44-44-44 / SPP 57 / MCP 50
 
I will try them memtest86+ 4.20 with the settings of post #17 and @1.8v this is probly taking a while, anyways im up until late.
 
THANK YOU GUYS FOR YOUR HELP SO FAR!

Im now runnning memtest with the exact settings from your post #17 with multi x7, night time already here and temps dropped down a bit, cool nights on this time of the year, but during daytime i would need some extra coolling from the air conditioner, maybe if i move my computer to the other room i could benefit from it during tests, but normally this pc should be on the room without ac (yes i know it sucks) im considering to do some lapping and replace the TIM on my heatsink (AS Ceramique)
 
I will report back in an hour or so with results of memtest!