Looking at the specifications of the Kingston RAM, it should work.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820104183&nm_mc=OTC-Froogle&cm_mmc=OTC-Froogle-_-Memory+(Desktop+Memory)-_-Kingston+HyperX-_-20104183

I agree, Alex......those Kingston's should be better stix. I sure hope it helps resolve the issue.

Let us know the results.

Well, good to hear! Hopefully you can get your stuff going!

Test the memory at the manufacturer's recommended timings and voltage of 9-9-9-27 @ 1.8v (split the difference in the voltage). 

Are you saying when you turn the PC on, the red CPU LED stays lit?  Do the other three LED's come on?

Test each stick individually in the black slot farthest from the CPU (slot #3) CPU for 8 hours with a bootable CD of Memtest+.  http://www.memtest.org/

Just so you are aware, I suggested testing your RAM in slot #3 because I recommend testing RAM in the slot that the motherboard manufacture recommends to use if you are running a single stick of RAM.  The slot varies from manufacturer to manufacturer, and board to board.  On the 790i SLI FTW (analog) board, the recommended slot for running one stick of RAM is slot #3, which is the second black slot.

One stick worked 10 hours 37 min - 0 errors
Another one is running right now 4 hours 46 min - 0 errors (I think 6-7 hours will be enough)
 
P.S.
 
Just finished watching iPad 2 presentation ... nice, but I'm a Windows fan and I wish to have such tablet only with Win 7

Second stick 7 hours 15 min - 0 errors
 
Now I start BLEND TEST in prime
 
**Memory Timing Setting**
 
Memory Timing Setting - [Expert]
x tCL (CAS Latency) – 9
x tRCD - 9
x tRP – 9
x tRAS - 27
x Command Per Clock – 2T
 
** Advanced Memory Settings **

[Auto].
x tRRD [Auto]
x tRC [Auto]
x tWR [Auto]
x tWTR [Auto]
x tFAW [Auto]
X RFC [Auto]
x tREF 7.8

**Frequency Settings**

CPU Freq, MHz – 3600
FSB Reference Clock, MHz – 1800
CPU Multiplier - [8X]
 
EVGA VDroop Control [Without VDroop]
CPU Core – 1.46875
CPU FSB – 1.425V
Memory – 1.800V
nForce SPP – 1.42V
nForce MCP – 1.550V
CPU PLL -  1.5V

GTLVREF Lane 0 [Auto]
GTLVREF Lane 1 [Auto]
GTLVREF Lane 2 [Auto]
GTLVREF Lane 3 [Auto]
 

JeffreyHam

Man, after all this time...I sure hope it all works out for you, Alex.

 
I wanna to believe in it too )) hope it was REALLY ONLY A MEMORY ISSUE
 
I know guys u all had enough of me please, be just a little bit more patient and maybe I'll succeed and leave u alone

the outcome is the following:
I ran BLEND TEST for 1 hour 38 min (gotta go now, so had to stop manually), passed 67-70 tests, 0 errors
 
guess I have just a little tiny stability
 
What is the next move ? Run BLEND for 8-12 hours?

You have to setup CoreTemp to get correct temps.  You need to enter the TJMax for your CPU.  I would run Blend overnight to be sure.  Please post a completed BIOS template of your current settings.

I have not used CoreTemp in years.  I use Everest Ultimate, which was bought out by AIDA64.  If you install it, click Computer - Sensors, and all of your temps will be located there.
http://www.aida64.com/product/aida64-extreme-edition/overview

VistaHead
I would run Blend overnight to be sure.  Please post a completed BIOS template of your current settings.

I also attached a pic of my idle temps

**Frequency Settings**
CPU Freq, MHz – 3600
FSB Reference Clock, MHz – 1800
CPU Multiplier - [8X]
PCIe x16_1 & 16_2, MHz - 100
PCIe x16_3, MHz - 100
SPP<->MCP Ref Clock, MHz - 200

**HT Multiplier**
nForce SPP --> nForce MCP - [5 x]
nForce SPP <-- nForce MCP - [5 x]

**Spread Spectrum**
CPU Spread Spectrum - [Disabled]
HT Spread Spectrum - [Disabled]
PCIe Spread Spectrum(SPP) - [Disabled]
PCIe Spread Spectrum(MCP) - [Disabled]
SATA Spread Spectrum - [Disabled]

**FSB & Memory Config**
EPP 2.0 Memory [Disabled]
FSB – Memory Clock Mode - [Linked]
FSB – Memory Ratio - [Sync Mode]
FSB (QDR), MHz - [1800]
Actual FSB (QDR), MHz - 1800
x MEM (DDR), MHz - [Linked]
Actual MEM (DDR), MHz - 1800

P1 - [Enabled]
P2 - [Enabled]

**Memory Timing Setting**
Memory Timing Setting - [Expert]
x tCL (CAS Latency) – 9
x tRCD - 9
x tRP – 9
x tRAS - 27
x Command Per Clock – 2T

** Advanced Memory Settings **
[Auto].
x tRRD [Auto(6)]
x tRC [Auto(45)]
x tWR [Auto(12)]
x tWTR [Auto(19)]
x tFAW [Auto(29)]
X RFC [Auto(110)]
x tREF 7.8uS - set manually, cause on AUTO it sets 7.7

**System Voltages**
EVGA VDroop Control [Without VDroop]
CPU Core – 1.46875
CPU FSB – 1.425V
Memory – 1.800V
nForce SPP – 1.42V
nForce MCP – 1.550V
CPU PLL -  1.5V

GTLVREF Lane 0 [Auto]
GTLVREF Lane 1 [Auto]
GTLVREF Lane 2 [Auto]
GTLVREF Lane 3 [Auto]

**CPU Configuration**
Limit CPUID 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]

VistaHead

Looks good!

So now I need to run BLEND for 8-10 hours with this settings ? If I pass without errors, should I run for "In-place large FFT's", LinX 0.6.4 - 20 tests, OCCT 3.1.0 -  priority normal, matrix (middle) ???
 
And I didn't quite get how to make Core 1 and Core 2 finish first