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Old 19-06-2011, 07:01 PM   #1
Offler
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X48 and Elpida Hypers, 8gb, High voltage needed

It seems that memory runs on fine on 1600 CL 8-8-8-24, BUT...

X48 specification says that so much memory on this frequency has to run on 1,9v. Current tests shows that this voltage must be followed. Skew rates are also 1-1-3-3 and seems stable.

Its not possible to lower the voltage (already tested). From Elpida datasheets the typical operation of those chips is 1600 CL8 at 1,5v, and 1,97v is the voltage where instant death my occur. I have heard that Elpidas died some time ago and thats why Corsair stops to sell them...

Whats the risk on this voltage?
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Old 22-06-2011, 04:43 AM   #2
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Running 1.9V Vdimm on the Hyper chips, especially for longer periods of time, is insane in my opinion.

I don't go above 1.75V for testing, I was scared already when I used 1.8V for a very short time ( it didn't help clocking them anyway ).
Are you really sure you need such a high voltage to get them stable? I've only tested 4GB of Hyper on my REX, and they did 800MHz 6-6-6-20 @ 1.65V without a problem. I've never experienced a situation where adding another kit of memory needed such a big increase in Vdimm on the DDR2 kits I tested.
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Old 22-06-2011, 06:06 PM   #3
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I was able to set it to 1.75v, at cost of insanely high voltage on northbridge.

Intel specifications say that X48 requires 1.9v on 1600Mhz so I returned to "stock" voltages for NB to detect other voltages on system. It had particular success because running 8gb ram caused really strange FSB behaviour.

If I lower CPU VTT on 1.10v (stock) the system will boot up, pass all memory tests and do BSOD on running any 3d application.

On 1.175 it changes behaviour - BSOD on bootup.

1.21v it seems to run fine, except random BSODs and data corruption

At 1,265v was my previous voltage for CPU VTT, but still there is some random BSODs. At 1.315v it runs fine and passed 500 linx tests with 771mb size.

Now I can try to lower memory voltage, but from my previous experience BSOD will occur on anything below 1.9v. Its a NB limitation, and can be compensated by running X48 northbridge on higher voltage.
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Old 23-06-2011, 04:19 AM   #4
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I think the 1.9V for DDR3-1600 was just a concession to the memory ICs of the time, when the data sheet was written, and board vendors that wanted to use the chipset had to make sure their boards support up to 1.9V Vdimm for the DDR3-1600XMP support. I wouldn't try to stick to the data sheet as closely as you do, as it's quite old.

Higher Vnb is needed for sure, but higher Vdimm seems really weird to me, especially such a huge need for voltage, the ICs don't like that voltage at all.
What's your Vnb now?
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Old 23-06-2011, 05:27 PM   #5
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Its quite old board and chipset. Previously I had Nanya 1600 CL9 sticks. Generally same memory as HP uses. Those were able to run both on 1,5v and 1,9v depending on dram data strenght and skew modes.

Currently Vnb is 1,31v.

Recent tests show interesting things in comparation of my previous memory. Ocz 1600Cl7 sticks were picky when it comes to Dram and data strenghts and skew modes. Elpidas MNH dont care about it at all.

By the way how the testing looks now:
Real temp, Windows Media Center running TV tuner live program, DFI utility for temperature measurement and LinX. When the Cpu VTT or other voltage is too low the Real Temp will crash as first. As second will fail test on LinX. Rest of results is just BSOD.

1,75 is the highest voltage which manufacturer recommended for those memory (A-data 1866+), however the memory is underclocked, and even CAS latency is blocked by the chipet (cant be lower than 8, when all dimm slots are populated).

The chips can do surely better than 1600 8-6-6-18. With only 2 sticks I was able to run them on 1333 5-5-5-15 or 1600 7-7-7-21 CR1 respectively.

Even when I lower memory voltage to 1,85v the memory controller stops working correctly no matter what. Under load it fails.

1,9v exactly, with adequate cpu vtt and only bit raised Vnb and everything works juuusf fine. Also even when i cannot run them on 1600 7-7-7-21 CR1 at 1600 8-6-6-18 Cr1 with aggresive skew settings the memory performs well. LinX shows performance of 47,69 Gflops with 771mb problem size which is excellent. From my previous experience most people with similar setting had 42-44 gflops. Mostly due CR2.

But before I decided to run then like this I put on them Arctic Silver coolers, and there are a lot of fans which take care of temperature...

This is first configuration when I attempted to run X48 with all dimm slots populated. Most people avoided this, or have chosen lower frequency. Then the memory can run even on 1,5v...

By the way those memory sticks also support XMP...
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Old 23-06-2011, 09:54 PM   #6
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Why are you running such a low Vnb, 1.31V is almost stock. I'm running 1.55V - 1.60V for testing, but I'm not using the board for 24/7 of course, however I'm pretty sure you'll have to raise it quite a bit for 8GB stability.
The memory kit should also be able to do better when only using one kit. I own that kit as well, but I've never tried it on the REX. The Dominator GT were the only Hyper I tested on it.

I have no idea about LinX bandwidth test, please post some Everest/Aida64 numbers, then I could compare it to my tests.

You're right, it definitely is an unusual setup.
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Old 23-06-2011, 11:38 PM   #7
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In everest the memory was able to read 9800mb/s +- Thats quite good for old x48 chipset. Most setups I have seen were able to read only 7800mb/s. I plan to hit 10gb/s by only tuning the MCH without overclocking.

well. I have Xeon x3360, basically xeon version of Q9550...

Althought the CPU is overclocked, and northbridge is loaded by 4 cores and 4 memory sticks (+graphic card) I really dont see any reason to raise Vnb voltage. Its X48 and 400Mhz FSB is its stock frequency.

I expect it to run fine only with CPU VTT raised a bit. Everything else should run on stock voltages. Except fact that Intel expects 1600Mhz memory to run on 1,9v (therefore at this configuration 1,9v is stock voltage for memory controller integrated in northbridge, but insanely high for memory).

At all the chipset is manufactured by infamous 90nm technology... even on stock with active air cooling its quite hot - 45 degrees of celsius. On 1,34 or more it produces up to 55 and I have seen also 65 when one fan stopped spinning ...
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Old 24-06-2011, 02:54 AM   #8
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Well theres 2 ways to look at this have a hot nb or kill your mems, your choice mate. those sticks will die running 1.9 v.
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