Intel MOBO DX79SR can't POST

Brian Stevenson

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Apr 6, 2013
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New build...

MOBO: Intel DX79SR LGA 2011
CPU: Intel Core i7-3970X Sandy Bridge-E
GPU: GIGABYTE GV-R795WF3-3GD Radeon HD 7950
RAM: G.SKILL Ripjaws X Series DDR3 2133 (PC3 17000), 8 DIMM x 8GB each (64 GB total)
PSU: OCZ Z Series Gold OCZZ1000M 1000W

This is my second board. The first one ran into the same problem that I'm having now; I have just the bare essentials (MOBO, CPU, 1 stick of RAM in the first DIMM, CPU cooler, power supply and keyboard) set up outside the case, I get the initial flash page, I can get into the BIOS, but after that, I get a black screen with a 0_ (that's a zero and a solid/non-flashing cursor or underscore after it) in the bottom-right-hand corner. It just stays there, frozen, unresponsive, until I reset. I get a 00 (double zero) status code on the MOBO's little status code display, which is "Entering ACPI S0 state, standard" according to the documentation, whatever that means.

This was happening with the original board; I called Intel tech support, they told me to do some things, like removing the CMOS battery (which didn't help) and updating the BIOS (which bricked the board, had to RMA it). Now with the new board, the original problem persists. I read on a sticky here that it could be a problem with the RAM voltage, so I adjusted the default 1.5v up to 1.6v (which is what the RAM says), but still nothing. I added in an optical drive with a Windows 7 Ult. install disc on it, went to the boot menu and selected to boot from it; got the 0 but no cursor/underscore, OD spun up, but then spun back down after 20-30 seconds or so, and the screen just remained frozen.

I'm at my wits end here, I've build many computers in my lifetime and I've never had so many problems with brand-new, high end components right out of the box like this.
 

Brian Stevenson

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Apr 6, 2013
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10,510


I've tried all eight different sticks of RAM (forgot to mention that). The board came with a DIMM population chart so I know it's in the first DIMM slot as well.

Same problem with a different GPU (it's actually an identical one, which I'll be Crossfiring...if I ever get this thing working)
 

Brian Stevenson

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Apr 6, 2013
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On suspicion that it might be a voltage issue, I did get a bunch of Corsair Vengeance modules that are rated at 1.5V. It operates at 2133 MHz though, like the G.SKILL that I have; I had no idea I had to match RAM up with the MOBO AND some hidden spec on the processor as well.

I should also mention that I originally had a Core-i7 3930K 3.2 GHz in there, and the exact same problem was happening, so I don't know if that CPU also has this weird limitation.

 

Brian Stevenson

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Apr 6, 2013
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It would be ridiculous, and down-right mean-spirited IMO, if they proudly advertise their top-tier motherboard with overclocking feature to be able to support RAM up to 2400 MHz but their top-tier CPUs can't. I mean, what the heck would be the point? Not like you could use an AMD CPU on the Intel board.
 

Brian Stevenson

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Apr 6, 2013
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Update:

Well, I got my new RAM today; 1.5 volts, 1600 MHz. I popped a stick in, same problem. I went to the BIOS and upped the speed from the default 1333 MHz to 1600 MHz, same problem. Went back to the BIOS, noticed that it had it's own XMP profile and switched that on, which loaded up the rated timing and so forth, same problem. I'm out of ideas. I'm completely stumped here. This convinces me that it was never the RAM's fault, and I have no idea what it could be anymore. I'm seriously thinking of just getting a new MOBO from a different company.
 

Brian Stevenson

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Apr 6, 2013
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Remember I originally had a Core-i7 3930K in it though? It happened with that one, and now it's also happening with the 3970X, both brand new.

I wish I knew more about ACPI, whatever it is. The debug LED keeps getting stuck right there at 00, "entering ACPI state."
 

Brian Stevenson

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Apr 6, 2013
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Nothing. It just won't get past that "Entering ACPI" part at all.
 

Brian Stevenson

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Apr 6, 2013
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Maybe so, though I have no clue which or where or how or...anything.

Got this from an independent tech support agent: "Tell him to get a new motherboard. It can be an Intel board again but it should be a different series. Honestly though, I’d say something in an Asus or Gigabyte would work fine. I really think it’s just a chipset error, and probably part of a bad batch of boards. I did find some product reviews of other people having issues saying it won’t work with higher end GPUs, but I would think that would be an issue beyond where he’s even getting stuck. I also see that as just another indication that the board has really unrealistic limitations for modern hardware and isn’t a good choice for what it looks like he’s trying to build. New motherboard from a different mfg (ASUS) is my recommendation."

Which sounds great...except Newegg will only accept an RMA for a same-model replacement, not a refund; so if that guy is right I'm either stuck getting faulty board after faulty board from Newegg or just being out $320 and getting a completely different MOBO......*sigh*
 

Brian Stevenson

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Apr 6, 2013
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Yep; bricked the board *sigh*

I just got off with Intel customer support; they're sending me a new board under the terms of the warranty. I just so happened to stumble across this today though: http://communities.intel.com/thread/37109

I've seen a couple other posts online with similar problems to mine; specifically people using Radeon HD cards that get the 00 on the debug LED and get stuck with a 0_ in the corner of the black screen. If even this third board, from a different batch as the first two, has the same problems, then I think it can safely be said that Intel's boards just aren't compatible with high-end Radeon cards, which is beyond ludicrous, considering the DX79SR is marketed to the high-end/enthusiast user. Should have an update within the next 48 hours.
 

Brian Stevenson

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Apr 6, 2013
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Well guys, I got the board from Intel, same issue. I popped in an old GeForce card I had, boom, works like a champ. Boy do I feel cheated by Intel; how can their high-end MOBOs simply be incompatible with half the high-end GPUs on the market? Wow.

It's too late for me to RMA my dual Radeon HD 7950 cards, so I picked up an ASUS Sabertooth X79 and I'm just going with that. Off to try to sell this Intel MOBO on eBay and try to recoup some of my $320 loss. Thanks Intel!

Moral of the story: Radeon users; run far, far away from this MOBO. "When it's all Intel, it's all good" says the box. My foot it is.

Thanks for all your input, guys.