Yea I thought it was the motherboard having trouble with 8gb but after about a month of fighting with the 790i ultra I finally realized it was the software that came with my Linksys network card which was causing my instability and stuttering. Removed that from my system and I've been running 8gb OC'd by 100MHz and the timings tightened a bit.

Stock my memory runs @ 1600MHz 9-9-9-24 1.5v

This is what I've got to before it hits its limits:

G.Skill 8GB 4x2GB Linked/Synced @ 1700 MHz 9-8-8-20 1.65v
1T (Works with 1T or 2T so I'm not touching it)
Other memory settings are set to Auto
tRFC: 74

Anybody wants pics or proof lol? I'm just suggesting you guys that can't get the system stable with 8GB look into your software since it might not be a hardware issue.

Doesn't want to run all 4 sticks at 1600MHZ (stock) without some timing tweaks. Runs beautiful at my sig. settings.

what is your thoughts on this.. I want to run 8 gig and at the max speed possible for the availability of memory I can get.  The problem I'm finding is all the stick I can find from EVGA's list is in the 1g per stick size.since I have this board (790i) and I want to overclock a Q9550  (stock 2.8ghz) to 3.6ghz or 3.8ghz shouldn't I be looking for memory at or above 1600??  AND at or higher than 1.7v?  I'm watercooling and I have alot of room for overclocking and keeping temps good. 

timkezlan, were your questions in post #'s 36-37 directed to me??? You did not specify to whom you were speaking.

So im looking to get new or more memory. Im currently running on only 2 GB of ram, kind of lame.  Im running a 780i vanilla SLi MB.
Id love to do 8GB but have not tried running 4 sticks yet. I did run 4 but they were a miss matched pair(2 1 GB and 2 GB sticks of Dominator) and yes I know it didn't end up working out in the end possibly causes instability that Im not having right now.
 
What is some good memory to look for?  Ive loved my Dominator but do want something reliable if running 8GB(if possible)

no troubles with 4 x 2 PC8500 here,
 

if you can go for 4 gig sticks.I talked with Mushkin and they hooked me up with a set of cas 7 that seem to like my 790 I Ultra better then my 4 stick 8 gig solution before,not to mention less stress on the controller and less Voltage (1.95 down to 1.65!! )

Mushkin Redline Ridgeback996982
i would talk to them if your mobo is anything other then the 790I Ultra to make sure,i worked with Mushkin Sean and Mushkin Tyler ,both were outstanding with my RMA and with choosing new ram for my mobo,AND advanced Bios settings.Cant say enough how happy i am with Mushkin customer service .

hey bio,
 
is this RAM for nvidia (EPP) or intel chipset (XMP) ?
are you using those sticks? what clocks and timings? I am looking slowly for 2x4GB ram kit able to run 1800MHz with decent timings.
 
found also this Patriot Viper II 2000MHz 2x4GB kit, just worried that it's designed for XMP (this one was designed for P55 chipset) and had bad experience from past with such Patriot sticks ...
http://www.patriotmemory....&id=995&type=1
9-11-9-27 @ 2000MHz 1.65V
 

BioHazardSperm

Mushkin Redline Ridgeback996982
i would talk to them if your mobo is anything other then the 790I Ultra to make sure,i worked with Mushkin Sean and Mushkin Tyler ,both were outstanding with my RMA and with choosing new ram for my mobo,AND advanced Bios settings.Cant say enough how happy i am with Mushkin customer service .

nice! kinda weird timings (7-9-8), but hell if it can run CR1 instead of usual CR2 than it might even compensate for automatic P1&P2

 
so you running them at 1600 stock? I might either get those and try OC'ing to 1800 or get 2000MHz (more expensive) and run at lower speed and tightened timings...

here ya go (i would hope by now you know the order anyways lol)
7/9/8/24 T1 P1/P2 Auto
6
36 (suggested testing 32-40 ,36 was stable saw no real benefit trying to pushing it lower,i could push down but why bother )
10
27
32
7.8us
120 (suggested testing 120-130 120 runs fine)
My old 996601 set was running at
8/8/8/24 T1 P1/P2 (whatever not auto is lol i forgot)
6
32
10
27
32
7.8us
88
 
As you see the only real difference is my TRFC going from 88 to 120 ,but the memory voltage and less mem controller strain.
Im quite happy

hmm, Mushkin also carries this 997008 2x4GB dual kit rated at 1866MHz (9-10-9-27) @ 1.5V
http://www.mushkin.com/Memory/Redline/997008.aspx
 

the kit I linked above was not compatible (1.5V is specific to intel chipsets only).
However I found this 2000MHz sticks (2 versions, only heat spreaders are different):
 
a) Mushkin Enhanced Blackline 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 2000 (PC3 16000) Desktop Memory Model 996990
Cas Latency: 9
Voltage: 1.65V
Multi-channel Kit: Dual Channel Kit
Recommend Use: High Performance or Gaming Memory
Timing: 9-11-9-27
Heat Spreader: Frostbyte Heatsink
 
b) Mushkin Enhanced Blackline 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 2000 (PC3 16000) Desktop Memory Model 996991
Cas Latency: 9
Voltage: 1.65V
Multi-channel Kit: Dual Channel Kit
Recommend Use: High Performance or Gaming Memory
Timing: 9-11-9-27
Heat Spreader: Ridgeback Heatsink
 
I have just bought Mushkin 996990 8GB kit (the other one is out of stock) at $110 shipped from newegg, they have 15% off all desktop memory for 3 days (coupon code BTEKDKD32 ).
http://www.newegg.com/Pro...x?Item=N82E16820226189
 
Sean from Mushin says this memory should run flawlessly on 790 Ultra with same primary timings as in specs (up to 2000MHz). Also he said this memory is good for P67/Z68 with only exception of frequencies which are a tad different on those platforms and have to be either 1866MHz (below specs) or 2133MHz (overclocked) which is not a big deal I guess That's in case I upgrade mobo+chip in a year or so
 
will let know how those sticks work for me once I get them.

perfect!
 
Installed 8GB kit of mentioned Mushkin Enhanced Blackline (rated 2000MHz, but running 1800MHz now) with timings 9-11-9-27 @ 1.65V and it runs great!
 
Just passed 10 rounds of Intel Burn Test 2.51 in max stress mode with no hiccups (only my CPu temps were a problem LOL!):

 
wondering how much I could tighten the timings at 1800MHz to squeeze the max juice out of those sticks ...

LOL
true. I will shoot him an email and see what numbers he returns in morning
 

BioHazardSperm

Call and talk to Sean,he is the man ,seriously if he cant get you at a better settings on those while under-clocking them(2000 to 1800) no one can.