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Asus P5q Pro Problem with 4 sicks of ram.

Last response: in Memory
March 19, 2012 11:15:21 PM

Hello all.
I have a Asus p5q Pro mobo which i have been running with 2x2 bg DD2 -800. Today i got my order from New Egg with my new case fans and another 2x2gb of ram The ram is the same as what is already in the computer..

Problems- I add the two new sticks for a total of 8g and the pc turns on, but nothing on my monitor. So, i thought to myself maybe one is bad. I took all the ram out and started the computer with just one stick in till i tested all 4. Everything worked fine.

So, I put my two old sticks in and 1 new stick, The computer starts to boot and when it gets to the screen saying "loading windows" it just reboots and keeps going.

Here are some things i have tried.

I played around with the timings to a 5-5-5-15-6-55-6 that i found in other fourms, That didn't change anything. I also set NB to 1.30 V and keep increasing a bit and decreasing, to no luck.

I really hope someone can help me with this I've looked everywhere..

System specs:
Windows 7 64 Home
Intel q9950
Asus P5q pro motherboard
2 4870's 1 gig.
a c 149 } Memory
a b Ĉ ASUS
March 19, 2012 11:48:41 PM

Did you try boosting the RAM voltage? Default DDR2 800 5-5-5-15 is probably 1.8v. You can try in .1 increments up to 2.2v.
March 19, 2012 11:50:15 PM

Yes sorry, I did try that. Started at 1.8 then went up as high as 2.10 which i seen in other fourms. Nothing helped =/
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a c 149 } Memory
a b Ĉ ASUS
March 19, 2012 11:53:42 PM

What RAM is it? Is it on the QVL?
March 20, 2012 12:04:15 AM


It is Gskill 6400CL5D-4GBNT
a c 149 } Memory
a b Ĉ ASUS
March 20, 2012 12:17:56 AM

QVL = qualified vendor list.

It's here under memory and device support. A pdf file.

I don't see that exact kit. There are a few very similar but not that exact one. It's usually not even a problem if a RAM kit is not on the QVL but it can cause problems occasionally.
March 20, 2012 12:27:53 AM

By the looks of that my ram should be fine.. I'm not sure what could be going on. Hopefully if this has happen to someone else they have a fix lol.
a c 149 } Memory
a b Ĉ ASUS
March 20, 2012 12:38:13 AM

Your exact kit is not on that QVL. It's rare but that alone is reason enough for it not to work. You tried everything I can think of. It's actually common for a voltage bump to be necessary when populating all 4 DIMMs in a DDR2 system. That did not fix it though. You might try 2.2v just for the hell of it.
March 20, 2012 12:40:05 AM

I just figured since the two i already have work fine, that there shouldn't be a problem with 4
a c 149 } Memory
a b Ĉ ASUS
March 20, 2012 12:42:07 AM

Some boards can be picky when all 4 slots are filled. Try 2.2v.
March 20, 2012 1:44:55 AM

many boards have issues running 4 sticks even if they are on the qvl.