Hey guys, I could use some assistance. Before I begin, I'd like to just state that this is my first built computer. I'm very happy that it is up and running, though I did run into some weird issues...it seems to be in tact. That being said, I'm not completely incoherent, though I do have a lot of learning to do :) So anyway, here's the issue:

This seems to be a common issue as I searched it on Google and it seems like many people have this problem. Though, no one has an exact answer and that sort of scares me. But I'm willing to follow whatever instructions you may provide. I've installed 6.00GB into slots 1,3, and 5(all of the gray colored ones) into my EVGA E757 motherboard. I changed the BIOS around minimally so that the memory will run at the proper timings of 8-8-8-24 at a voltage of 1.65 and 1600mhz. I installed Windows 7 to accommodate for the 6GB and all went well. I checked Windows' System Information of my computer and it says 6.00GB(3.99 usable).

So here is what I already tried:
-Flashed the BIOS with the drivers located on the EVGA site (didn't flash anything with any of the updates posted here yet)
-Heightened the CPU VTT to 250.
-Used Windows Memory Diagnostic Tool with no errors found.
-Checked CPU-z to see if 6GB is being detected there(it is).
-Took out the memory and placed them back in the motherboard.

Here are my specs(sorry if I leave anything out):
EVGA E757 Motherboard
Intel i7 920 CPU
6GB Corsair Dominator RAM 1600 8-8-8-24 1.65v
Rosewill 1000w PSU
EVGA GTX 260
Windows 7 64-bit OS

I haven't tried remapping the heat sink yet because I'm sort of pessimistic that would work, I'm thinking more along the lines of a BIOS setting. Anyway, assistance is appreciated and if there is something I left out that you need to know, please tell me. Anything to get this working. Thanks again.

why not use slot 1-2-3 ? they are reccomended...

Please copy and fill out this template and post it here:

http://forums.evga.com/tm.aspx?m=1430

Just some thoughts, The grey slots are the correct ones but on my 757 they are numbered 1,3,5.
I don't think you need that much VTT, I use around +175.
I went to MSCONFIG/Boot/Advanced options, and unchecked "Maximum memory"

Mike

As much as I hate bumping my own thread, I am in need of assistance. Even if it is someone with a similar set up (core i7 with Dominator RAM) can tell me whether or not they've had the same issue. It's a weird problem, but I can't be the only one who has experienced it. I'm trying to weigh out my possibilities, but I really do need some help with that. Thank you.

For the record I actually still have this problem as well. My rig is in my sig. Whenever I go above 180 I lose anywhere between 2 and 8 gigs of ram. 

Only difference is... now that I am watercooling and I flashed the bios, I actually can't boot between 180 and 194 bclk. BUT I can boot, and am prime stable, at 200. Now when I reached 200, I had some WICKED voltages. So I worked to sloooowly lower them. At first I started with only 4gb of my ram being useable, out of 12. As I lowered my voltages, particularly my vdimm, I jumped to 10gb usable. I then BSODed once at some point, and I am down to 8gb usable. With my vdimm at 1.5v.... I can see 8-10gb of ram. If I jump it to even 1.55 I drop to 4gb. I have tried to time and time again, it happens every time. Keep in mind this all only happens when I am above 180. I have ran memtest multiple times and I have RMAed 1 stick of ram because it was bad. 

Not trying to hijack this thread, just letting you know I have a very similar situation, and I've collected a bit of info about it.... I hope someone can figure this out soon, and I hope it doesn't involve RMAing my motherboard.

Hey Fendulon, I thought you have the problem fixed? I thought it was a bad ram module.

btw: I saw your wc photo at overclock forum ( if I remember correctly ) almost 3 months ago and it look good

WB

Fendulon

  What I found most interesting was that by dropping my vdimm all the way down to 1.5 has made more ram available.

interesting note. How many ram is available during boot? " the black boot screen "

I haven't have any issue so far on dissappearing ram on all my i7 systems, but I am also wanting to see what is the causes and fixed for this issue for future reference. i have mostly G skill and corsair , and I notice my G skill like 1.60 dimm better than 1.65. and at 1.60 dimm, i could run the ram at 2000MHz @9-9-9-24. while at 1.65 or 1.66 it was not stable after 3-4 days

WB

could it be a newer bio issues??/ http://forums.evga.com/fb.ashx?m=172958

I am running bio version ( don't remember bio version ) that was installed on mobo from factory and never did a update on it. (since it is not broken so don't fixed it)  maybe it is wise to check it out.

what bio version are you people running???

WB

Well before watercooling, when I was just running at 179 bclk, I had S61J. When I installed watercooling I made sure everything was ok, no leaks etc, and I updated to Bios 44. I was VERY happy with the results when I updated. I was able to boot at 200 bclk and start tweaking all my voltages. I did try to overclock with S61J, but didn't get good results. I just kind of had a random thought and figured, hey, why not lower my vdimm... since my ram IS disappearing. And then I got up to 8gb. I haven't gone any lower than 1.5v, though I suppose I could. I may also try rolling back to an older bios as well.

luigi1928

Well, I've had the same EXACT problem. I could only use 4.59 GB out of my 6 GB of RAM. Here's how i fixed it:
 
Press start then in the search type "msconfig"
Go to the Boot tab
Click on your installation then click Advanced Options
Check "Number of Processors" then put in 8 as the i7 technically has 4 cores but 8 threads.
 
This is how I fixed my problem. Now just restart the computer. Tell me if it worked.

e

This is usually one of the first suggestions that is given. It hasn't fixed mine, and I think he was already suggested to do the same thing, didn't fix either of our problems. Thanks for that though. I wish it was that simple in these cases, but it seems far more complicated. We are still trying to pin down the exact problem.

That is a very interesting suggestion sengutso. I am going to try that tomorrow. I will boot at 179, which is my magic number, and use eleet to get all the way to 200... see what happens. I will let you all know my results tomorrow.

sengutso

Fendulon

luigi1928

Well, I've had the same EXACT problem. I could only use 4.59 GB out of my 6 GB of RAM. Here's how i fixed it:

Press start then in the search type "msconfig"
Go to the Boot tab
Click on your installation then click Advanced Options
Check "Number of Processors" then put in 8 as the i7 technically has 4 cores but 8 threads.

This is how I fixed my problem. Now just restart the computer. Tell me if it worked.

e

This is usually one of the first suggestions that is given. It hasn't fixed mine, and I think he was already suggested to do the same thing, didn't fix either of our problems. Thanks for that though. I wish it was that simple in these cases, but it seems far more complicated. We are still trying to pin down the exact problem.

you know the easiest way to avoid the 3.99 usable problem just overclock on your bios until u dont have that 3.99 problems and from there just use Evga Eleet to overclock on windows then my friend u can have high oc settings and still use 6 gigs of ur ram

I can't claim to know exactly how the E-LEET utility works but if I were to set the utility to let's say 150 and restart, it'll go back to whatever it is set to in the BIOS. Perhaps I am looking at this all wrong, or perhaps I myself am doing something wrong but I can't say for sure. I've tried the msconfig suggestions but to no avail, sadly.

CPrestridge

E758_SZ2P  I had to downgrade to a bios from the end of august to get my configuration to actually work.

I also tried the new bios and ran into your problem.  I have 6gigs of DDR3 1600 from OCZ.  Windows suddenly only had 2gigs.  I have been running my 6gigs at around 1650 mhz with 4315mhz on my cpu from half a year now.  So i was shocked when i suddenly only had 2 gigs after a bios update.  I then tried the previous bios and the same thing happend so i tried the SZ2X and Z and it still happend.  So i went all the way back to my last bios which was the SZ2P and poof all my problems vanished and i booted back up to 4315 its actually set to 20 X 206 but i get 21X205.something so i only get 4315mhz.  But hey its a good overclock for the 920 and i have my ram at 1650 ish.  I hope this helps you out.

So your suggestion is to downgrade the BIOS. I suspect to do this, would be the same as when you upgrade(same steps?) I have the 757 board, if what you say can help than it would take a bit of work finding out which of the earlier BIOS versions would fix the issue, though at least I know that is a possibility. Thank you.

I've set the BIOS settings back to default. With the Dominator RAM, it doesn't automatically go to 1600 with the correct timings unless XMP Profile 1 is set. But I left it at default, set the CPU at 149 and rebooted. Usually it would say 3.99usable but without the RAM set to 1600, it worked. So there is absolutely no way now to keep both?