There has been discussion to the effect that the HyperX 2933 available now is not the same (different chips on the modules) as was being furnished in systems some months ago, and that they are not compatible as pairs.  Suggest going back through messages.  DIMM's to be used as pairs should be bought together to minimize this problem.

Many buyers who ordered 16GB 2933 speed in their R7, like me, discovered a single-channel 16 instead of dual-channel pair of 8's, causing effectively a 25% speed loss - it runs slower than dual channel 2666 even though it cost $100 more than 2666.  If tech support can't help you get those two working, you may have to return the new module, shelf or Ebay your original one, then buy a pair.  I had no choice except to replace my 16, and since Dell had no 2933's at the time, I sought advice online.   Users were not having any luck at the time with other brands of ram pairs, because the R7 BIOS/MB doesn't allow timing adjustments.   Eventually someone found that GSkill Ripjaws V 3000 worked, so I bought them.  The irony was that tech support advised me that my warranty support would be invalidated, which PO'd me thoroughly.

Dell has been plagued with problems about improper ram shipments in new systems, not stocking upgrade parts, and giving bad advice, especially about the 2933 stuff.   Wish you luck.

I read aurora r7 support 2x16gb HyperX Fury 2933, but why i'm having problem?

Answered that above.  You might have two HyperX which were made with different parts, and will not work together.  Pairs should be identical, bought at the same time.  If not, they may or may not work.

No, they didn't.. I'm having the same problem: first start bios recognizes 2 ram and it warks, if i reboot windows no.

According to the fairly extensive research I've done on this issue, there "supposedly" is a slight timing difference between the HyperX 2933MHz factory and Dell/Alienware OEM modules.  I have not however been able to get anyone to validate what the timing differences might be.  I do know that according to CPU-Z the modules "appear" to be identical, but mixing the two seems problematic.  In some cases they work, in others they do not.  Alienware has taken a lot of flak over the memory compatibility issue and I actually got an apology from Dell over the matter.  You might want to load the latest BIOS, Version 1.0.11, and see if that helps; it states that it "Improved the memory compatibility for 2666Mhz memory modules."  It may have also addressed the compatibility issues with the 2933MHz modules as well.

---

@Daemonxs wrote:

i bought a second ram hyperX fury 16 gb 2933.

---

From where did you buy this second RAM module? If you bought it from Dell, do you have a link to the page on Dell's site?

You can buy it it from HyperX direct, from Amazon, Tiger Direct and other places, including Walmart.  No one seems to be able to get it from Dell.

https://www.hyperxgaming.com/us/memory/fury-ddr4?partnum=HX429C17FB/16

---

@AlaskaWolf wrote:

No one seems to be able to get it from Dell.

---

I don't see any pages on Dell's site showing upgrade or replacement parts for Aurora R7s.

If you go to the parts page, scroll down to the Product Family section and click the "Alienware Desktops" link, the R7 still isn't listed. Kind of strange.

---

@Pex wrote: 
I don't see any pages on Dell's site showing upgrade or replacement parts for Aurora R7s.

---

That's because there aren't any. Try putting in your Service Tag in Dell Parts, all you will get back is the message "No compatible products found for the requested service tag."

Part of an apology that Dell set me, "Also we have sent this information to our product development team so they can work out on improving the upgrade parts for the Aurora R7." It's not like they don't know what is going on.

I'm having the same exact problem though when I first purchased the RAM (from Amazon: HX429C17FW/16) I didn't have any issues at all beyond that I couldn't OC to 2933 (stuck at 2400) if both sticks were installed. After a BIOS upgrade (I believe it was v1.0.11 or higher) about 3 weeks ago, I thought it failed and bricked my R7. Had on-site tech come to replace the MoBo and he discovered that it was due to the memory where the display would stay black with both sticks in. Remove one and it's fine (doesn't matter if it's the Dell OEM Kingston or the other Kingston I purchased). 

He finally got the screen to display but couldn't enter BIOS since the screen would black out. I pulled one stick then upgraded to 1.0.13 and was fine (again other than being able to OC) until about 2 nights ago after upgrading to 1.0.14. Now I'm perpetually unable to use both sticks since when I reboot it'll black out my screen. So bizarre... 

Will eventually try another of the same non-OEM Kingston stick to see if that solves the issue.

Hopefully Dell support or anyone else reading this might have an update as to the cause?