Curse

Lord Sojar · Oct 23, 2009, 03:35 PM // 15:35

Uh... 780i and 790i boards seem to have issues with certain RAM modules in dual channel.... specifically if all 4 memory banks are filled. I can't remember why though, but yeh, it's an unfortunate thing. Can you return the RAM and get new modules from a different manufacturer?

malevolence · Oct 23, 2009, 07:38 PM // 19:38

Quote:

Originally Posted by Rahja the Thief

Uh... 780i and 790i boards seem to have issues with certain RAM modules in dual channel.... specifically if all 4 memory banks are filled. I can't remember why though, but yeh, it's an unfortunate thing. Can you return the RAM and get new modules from a different manufacturer?

Sadly thats not an option

(I can RMA the modules to get it from the same brand in this case , Corsair)

I did more test and the results are just crazy as hell. Every test I ran before (with memorytest86 proof that all my 4 modules works 100% , so I guess this is a slot issue of the 780i/790i motherboards?)

I have 4 modules , lets call them A,B,C and D.

There are 4 Slots , lets call them 0,1,2 and 3

Now I will list the setups I ran with Prime95 :

Setup1
-------
A,0 & B,2 = Ran a 9+ hours of Prime95 stresstest without errors/crash
A,0 & B,1 = Crash in less than 5 min
A,0 & B,3 = Crash in less than 5 min
A,1 & B,3 = Ran a 1+ hour of Prime95 stresstest without errors/crash

Setup2
-------
C,0 & D,2 = Ran a 1+ hour of Prime95 stresstest without errors/crash
C,0 & D,1 = Crash in less than 5 min
C,1 & D,3 = Ran a 1+ hour of Prime95 stresstest without errors/crash

Setup3
-------
A,0 & B,1 & C,2 = Crash in less than 5 min (Blue screen before crash !!!)
A,0 & B,2 & C,3 = Crash in less than 5 min (Blue screen before crash !!!)
A,0 & B,1 & C,3 & D,4 = Crash in less than 5 min (Blue screen before crash !!!)

So , the motherboard is also out of warranty , should I kick it and break it and buy a new one ? or there is something I am doing wrong here ?

Each module has 2GB.

If I need to get a new motherboard , what motherboard you do recommend me ?

Elder III · Oct 23, 2009, 11:23 PM // 23:23

well to tell the blunt and honest truth - you don't need 8GB. 4GB is plenty for whatever you want to do at the present. However the more future proofing you can do the better. See if XFX has a list of compatible memory on their site. And don't kick 'n break anything - those parts are still worth $$$ if you don't want them EBAY is your friend.

malevolence · Oct 24, 2009, 11:00 AM // 11:00

Quote:

Originally Posted by Elder III

well to tell the blunt and honest truth - you don't need 8GB. 4GB is plenty for whatever you want to do at the present. However the more future proofing you can do the better. See if XFX has a list of compatible memory on their site. And don't kick 'n break anything - those parts are still worth $$$ if you don't want them EBAY is your friend.

no worries I will not break anything hehe. I was checking the xfx website and I found this information : Maximum FSB for DDR3 is 1333 Mhz and Maximum FSB w/EPP is 2000 Mhz .

How do I know if my corsair memory modules have EPP

*EDIT*

I have 4 TW3X4G1600C9DHX , and according to what I found out , they are not EPP. The EPP version of these memory modules is TW3X4G1600C9DHXNV , where the NV = SLI-ready w/ EPP profile.

So that means I cannot run my memory in 1600mhz ? I will try running them at 1333Mhz and see how it goes, I was not aware aboyt the EPP stuff.

*EDIT*

Yes , I fixed it ! finally, lowering to 1333Mhz fixed the issue , I can boot and ran prime95 without crashes yay.

So as my ram is not EPP I need to lower the FSB to 1333 mhz.

Alright , as this is fix, I would like to thanks all the people that left a comment here and tried to help me with this issue.

Thanks for all the advices

Cheers.

Elder III · Oct 24, 2009, 06:08 PM // 18:08

sorry about the RAM being non EPP, but glad to hear it's working and stable now - you probably won't notice any perceivable difference either way though.

malevolence · Oct 24, 2009, 08:25 PM // 20:25

Quote:

Originally Posted by Elder III

sorry about the RAM being non EPP, but glad to hear it's working and stable now - you probably won't notice any perceivable difference either way though.

I was just playing dreamkiller

hell of a shooter , shoot shoot shoot , and of course no crashes , it works fine.

malevolence · Oct 30, 2009, 09:42 AM // 09:42

Again , and I think this is my last update.

My PC is working fine since I change the Memory FSB , I am running at the end at 1066Mhz , as I have all the slot populated and 1333Mhz wasn't stable enough. I have even overclocked my cpu and is working great ! no more issues or crashes. Stable for more than 9 hours with prime95 !

I believe this topic can be closed.

Again, I would like to thanks everyone on guru for helping to get my PC running and stable.

Thanks a lot !

Cheers.