Problem with memory: 4gb=stable 8gb=crash

julianbautista87 · Sep 7, 2014

Hello.
I have this system, working very well:
processor: intel Q6600
board: xfx 790i ultra sli
card: Sapphire R9 290 (what a freaking monster)
psu: pc power and cooling silencer 750w
memory: 2x2gb ocz3p16004gk (stock 7-7-7 @1.9v 1600mhz)
memory timings: 9-9-9-24 2T tRRD=8 tRC=34 tWR=12 tWTR=21 tFAW=41 tREF=7.8us tRFC=78
memory voltage: 1.5V
memory frequency: 1066MHZ

This system is working perfectly, even with demanding games like Metro last light.

When I try to add another pair of memory sticks to my board (same reference, same exact sticks, working sticks, I tried them and they work just as good), it boots but crashes when it's starting Windows. I really don't know what the problem could be.

All memory timings are configured manually because this stick requires 1.9v to work at factory settings and that's a lot of voltage, so I had to configure everything manually and evaluate its stability through trial and error.

okcnaline · Sep 7, 2014

Possibly your Windows installation is 32-bit. It can't access more than 4 GB and/or crashed.

And also, I would suggest running Memtest86+.

julianbautista87 · Sep 7, 2014

okcnaline :

I forgot to say: Im using windows 8.1 64bit. I'll try memtest86+ and ill tell you what i got.

okcnaline · Sep 7, 2014

Okay. And also, did you OC? Thanks for replying though!

julianbautista87 · Sep 7, 2014

okcnaline :

Hi. Nope, no OC at all, I'm actually running the memory on a slow configuration. No OC on the GPU either.

Tradesman1 · Sep 7, 2014

Generally when you add sticks to 775 you need a little extra DRAM voltage and NB voltage - try about + 0.06 on both DRAM and NB voltage

julianbautista87 · Sep 8, 2014

Tradesman1 :

I'll try that tomorrow, and I'll tell you what happened.

Tradesman1 · Sep 8, 2014

Will be around

julianbautista87 · Sep 8, 2014

okcnaline :

System crash during Memtest86

julianbautista87 · Sep 8, 2014

Tradesman1 :

It didn't work. More voltage didn't do anything.

I tried to raise tRFC to 140. It did boot, enter windows and even let me browse some websites. But it crashed after 6 minutes and it was kind of slow.

I think it could be the mainboard, but the memory isn't that great either... I really don't know what the problem could be, I'm completely clueless

Tradesman1 · Sep 8, 2014

How old is the PSU?

julianbautista87 · Sep 8, 2014

Tradesman1 :

The PSU is 5 years old. PC power and cooling though (And it wasn't used for like 3 years, the previous owner is friend of mine, he was in another country for a long time)

okcnaline · Sep 9, 2014

Just for the LOLz, what is your motherboard? Talking about max motherboard RAM.
And try Memtest with 1 stick of your RAM. Must be somewhere around here.

Tradesman1 · Sep 9, 2014

Might see if you can borrrow a different PSU and give it a try

julianbautista87 · Sep 9, 2014

Tradesman1 :

OK, why not. I'll try it this weekend. I'll keep you updated, thanks for all the help so far.

Tradesman1 · Sep 9, 2014

No worries !

Pinhedd · Sep 9, 2014

julianbautista87 :

You must be joking or mistaken about that voltage.

If it was DDR2 I'd say that 1.9 volts is fine, but DDR3 specifies 1.5 volts as the standard and 1.9 volts as the minimum that modules must be able to tolerate before damage is incurred (most tolerate just under 2 volts). That's the DRAM modules themselves, the memory controller is typically lower. The do-not-exceed DRAM supply voltage for Intel's current generation IMC is around 1.8 volts with the internal logic around 1.4 (these values are not always published, but are pulled from Intel's datasheets when available). I can't imagine that NVidia's memory controller is any better. By running those modules at 1.9 volts you may have damaged your motherboard.

Furthermore, secondary and tertiary timings are incredibly fickle. These are computed and measured during the DRAM initialization procedure and may not be the same after adjusting the memory configuration. Entering them manually is not recommended.

Try loosening those timings up a bit and get that voltage back down to something reasonable before you damage your motherboard beyond repair.

julianbautista87 · Sep 10, 2014

Pinhedd :

julianbautista87 :

You must be joking or mistaken about that voltage.

If it was DDR2 I'd say that 1.9 volts is fine, but DDR3 specifies 1.5 volts as the standard and 1.9 volts as the minimum that modules must be able to tolerate before damage is incurred (most tolerate just under 2 volts). That's the DRAM modules themselves, the memory controller is typically lower. The do-not-exceed DRAM supply voltage for Intel's current generation IMC is around 1.8 volts with the internal logic around 1.4 (these values are not always published, but are pulled from Intel's datasheets when available). I can't imagine that NVidia's memory controller is any better. By running those modules at 1.9 volts you may have damaged your motherboard.

Furthermore, secondary and tertiary timings are incredibly fickle. These are computed and measured during the DRAM initialization procedure and may not be the same after adjusting the memory configuration. Entering them manually is not recommended.

Try loosening those timings up a bit and get that voltage back down to something reasonable before you damage your motherboard beyond repair.

Hi. As I stated, my memory is running at 1.5V, 1066MHz, 9-9-9-24 2T tRRD=8 tRC=34 tWR=12 tWTR=21 tFAW=41 tREF=7.8us tRFC=78.

Problem with memory: 4gb=stable 8gb=crash

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