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Question: 4 channel memory I never got 3 channel memory to work properly on an ASUS MB using Intel 82801J1B chipset.  (9gb installed, 6gb recognized) I won't but a new MB without evidence that ALL memory channels are supported and useable by Windows 7.  Can anybody help??
Document: I built a new desktop using this ASUS motherboard. I have been getting all of the components installed and have it up and running now, 4 months after buying the motherboard. I am very pleased with it and the service I got from both Amazon and the supplier, PC Parts Depot. It is cutting edge or as close to the edge as I want and makes a very good base for a gaming computer or for any use. It has the newest processor that is stable and can have loads of RAM. I am using it with 16 MB of RAM and a 256 MB SSDD boot disk (C:).
I expect a stock board to work, especially at the tune of $300 clams. Wound up sending it  all back and decided against upgrading - I don't pay over $314 (more accurately, $1,700 in total with all the other bits necessary to upgrade - memory, video card, cooler, i7 4930k processor, new OEM Windows 7 because of Microsoft's licensing-per-board, etc. ), and wait two weeks for everything to ship only to break my back tearing everything out again thanks to ASUS' lousy product control (particularly on the high-end boards).Perhaps I have nobody to blame but myself: I made the mistake of building the box about 6 years ago with the ASUS P5B Deluxe board, and was never quite happy with it.
I never overclock either the processor or memory. I use middle end graphics. I bought this one as it had the 6Gb/s SATA and USB 3.0 ports. It also had built in wireless. I have returned to using Intel boards as their customer service has improved.
After the bios loads your computer will restart and load the new BIOS into the motherboard. It then restarts and loads Windows.I am having fun with this new system and sometime next week I will be ready to crank it up. I am looking to achieve 4.8 to 5 GHz on the CPU. Here is my computer build:CASE  COOLER MASTER HAF 932 Advanced Blue Edition RC-932-KKN3-GP Black Steel ATX Full TowerMEMORY  Corsair CMZ16GX3MX1600C9G 16 GB matched set time 2 for 32 GB memoryPSU  Rosewill BRONZE Series RBR1000-M 1000WLIGHTS  LOGISYS Computer CLK12BL2 12" DUAL COLD CATHODE KITMOTHERBOARD  Asus Sabertooth X79 TUF MotherboardCPU COOLER  CORSAIR H100 (CWCH100) Extreme Performance Liquid CPU CoolerFANS  Fan kit for Hydro Series H80/H100 High Performance Liquid CPU CoolerOPERATING SYSTEM  Microsoft Windows 7 Professional SP1 64-bit - OEMGPU CARD  SAPPHIRE 100311SR Radeon HD 6970 2GB 256-bit GDDR5SSD  Corsair Force Series GT CSSD-F180GBGT-BK 2.5" 180GB SATA III Internal Solid State Drive (SSD)HARD DRIVES  Four Seagate - Barracuda 2TB Internal HD Sata IIHARD DRIVES  Seagate - Barracuda ST1000DN003 1 TB 3.5" Internal HD Sata IIIDVD DRIVE  ASUS 24X DVD Burner  Black SATA Model DRW-24B1ST/BLK/B/AS - OEMBLU-RAY DRIVE  Pioneer Black  SATA Blu-ray Burner BDR-206DBKSCPU  Intel Core i7-3930K Sandy Bridge-E 3.2GHz (3.8GHz Turbo)130W Six-Core ProcessorMicrosoft Office  Microsoft Office 2010 Home & Student 3-UserMicrosoft Outlook  Microsoft Office Outlook 2010Extra Case Fan  Rosewill RFX-120BL 120mm 2 Ball Bearing Blue LED Case Fan
Got this board to build a new machine for my wife. I installed an I7-4930K, powered it on and then... nothing. I Google'd the board and found from the ASUS website that it may not work because the BIOS that the board shipped was not compatible with the processors. After updating the BIOS, which was really easy using a thumbdrive, I was sure that the problem was solved. Wrong, I still had the CPU led lit up. I checked the power supply using a multimeter(PS OK) and replaced it with a known good one just to make sure that it was getting sufficient current; still nothing.
No detail of quality is overlooked by the manufacturer. I matched this motherboard with and Intel 3.6 GHz CPU, 1600 MHz DDR 3 memory (motherboard is capable of up to 2400 MHz memory), ATI 4890 1GHz DDR5 memory, and a Kingston digital Hard drive, and a 1000 watt power supply. I was trying to improve the video graphics of my flight simulation games. Well, I got improved graphics and much more. My overall system performance is rated at 7.6 out of a possible 7.9 (this is due to the video card which had the slowest rating).
I will keep my fingers crossed.UPDATE:  The third MB arrived and I got it installed. I checked out the audio, and it worked. Memory registered completely at 64 Gig. Things worked for a week and then audio went out. I could not believe it..three in a frickin row! I figured Amazon would not believe it either, so I bought a ASUS Xonar DGX ePCI 5.1 card rather than replacing it. I then disabled audio from the motherboard and I am so far happy.SPECIAL NOTE: I am keeping the box just in case this has to be returned sometime during the 5 yr warranty.
This is my 3d build over the past 10 years. Other 2 went without a hitch.Installed all the internal hardware (i7-3820, 16 gigs RAM, Samsung 840 SSD,  CM Hyper 212 EVO, EVGA GeForce GTX 660 SUPERCLOCKED, Asus 24xDVD-RW), Windows 7, the drivers (from the mobo's DVD) and updated everything. Ran Prime95 and memtest86+ several hours each, w/ positive results.Plugged in analog speakers in the rear port to try out the new rig on a game. No sound at all.
Built a new PC w/an i7-4930K processor. Based on reviews, was expecting to have to flash BIOS and work out the kinks but to my surprise, everything was up to date on this board. It posted, recognized CPU, memory, HDD and SDD w/o a hitch. Loaded Win7, setup SDD caching...no problem. The system is quick and responsive. Running a GTX 660 video card and there's nothing to complain about. Having not built a PC in a while, I've little for comparison but it boots to a login prompt in 30 seconds and login completes in 7-8 seconds.
I purchased this board two months ago for my first build in preparation for the Diablo 3 and Max Payne 3 release. Although the memory specifications for the Sabertooth X79 were overkill, no game really requires over 8GB of RAM (not even that much), I wanted to make sure that my first build would not require an upgrade for some time to come. Upon receiving the board I flashed the BIOS and conducted a POST before running installing the OS. After installing Windows 7 Ultimate the board worked perfectly recognizing the 8X4GB of RAM.
Answer: As far as I know....the 3 channel was/is in the x58 northbridge (for Intel i-core series gen.1) coupled with the ICH10 southbridge. The 82801J1B was/is the hd audio controller in the ICH10 family...either way these are s/bridge operations. That shouldn't effect the ram (goes through the northbridge). What kind of motherboard did you have this problem with?As for the quad mem. channels.....I don't know of anyone, myself included, that has had a single problem with it. This board's drivers ....how to word this.....allow the ram and northbridge to be seen by the quad mem. channel controller in the CPU....and then post this as viable buses in windows. Windows doesn't really know it is quad channel, but sees all of the ram. There are kinda OSI things going on there. The physical layer doesn't really need to know what the software layer is doing....and vice versa. One of the Win7 Kernel's jobs is to put out layers of opacity to make moving up and down the OSI? simpler for both the hardware and the software.  So in a nut shell, Win7  supports it, and if you are purchasing 2011 socket hardware....then that will support it. If it doesn't then it's either a bad component or user error.