P35-DS3P failes with 8GB

[ajt]

Greetings,

I have 4x2Gb memory modules (OCZ), nothing is overclocked. The board will run 4GB of this memory, but fails memtest86 on the first pass with 8GB.

The memory isOCZ DDR2 PC2-6400 Titanium (OCZ2T800C44GK).

Any suggestions?

Rgds/Alan

[HemiRick]

Up Ram and mch voltages in the bios. .10v and try again

[Lsdmeasap]

With 4GB overclocking or not you are going to need to get those memory timings off of auto!

I suggest these things for starters (Items in BOLD are Important) >>>>

You may leave the rest on auto for now if you like, other then the 4-4-4-15 and the bold items

DRAM Timing Selectable_______ SPD __ [Manual]
CAS Latency Time________________4
Dram RAS# to CAS# Delay_________4
Dram RAS# Precharge Delay_______4
Precharge Delay (tRAS)__________ 15
ACT to ACT Delay (tRRD)_________3-4
Rank Write to READ Delay________ 4-6 or 9-11
Write to Precharge Delay_________ 3-6
Refresh to ACT Delay______________52-62
Read to Precharge Delay__________ 3-6

Static tRead Value_______________ 7-10 Starting at 10 and then work down
Static tRead Phase Adjust________ 1-31 Leave on Auto/0/ or 1-31

System Voltage Control____ [Manual]
DDR2 OverVoltage Control__ [+0.300V] Set to your Rams Voltage it will be on the sticker. Some stock is 2.1 =+.3 some stock of the same sticks is 2.2 = +.4

FSB OverVoltage Control___ [+0.1V]
(G)MCH OverVoltage Control [+0.1V - +0.15V]


As for 8GB you may find better more direct suggestions in the forum for that ram, but that above should get your closer. Auto IS NOT going to work with 8Gb I can tell you that for sure >>>
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[ajt]

Thanks very much for your time. The system settings you suggested have improved things a little in that I can now run 6GB, but not 8. I'm still trying with some of the combinations you mentioned...

If this does not come together, can you suggest a m'board that will cope with 8Gb fairly easily?

Rgds/Alan

[Lsdmeasap]

Your board probably will just fine, it is just finding the correct settings to do so. I have experience with only 4GB that is why I suggested to ask at the OCZ forum, they would better be able to tell you some general settings for 8GB.

So, what are you settings as of now? And what did you try with 8GB that fails still?

*EDIT*
I found this post with OCZ reapers using 8GB settings are shown. You will likely need some different settings, but I would think similar would be sufficient.
8GB PC 6400/8000 on DFI LP35 LT/UT - OCZ Forum

But Like I said, best to ask some of the guys at OCZ, they will surely already know the best for 8GB of those sticks

[ajt]

Hi,

No luck I'm afraid. The information you gave me was very helpfull, but no luck yet.

Currently:
6-6-6-18
ACT to ACT Delay (tRRD) 4
Rank Write To READ Delay 11
Write to Precharge Delay 12
Refresh to ACT Delay 62
Read to precharge Delay 6
Static tRead Value 10
Static tRead Phase Adjust 31
DDR2 OverVoltage Control +0.35
PCI-E OverVoltage Control +0.05
FSB OverVoltage Control +0.1
MCH OverVoltage Control +0.1


Running out of ideas ....

Rgds/Alan

[ajt]

Can I clear up a question I have about the memory voltage.

Is it correct that this board sets the memory voltage to 1.8V for all memory? The memory I am using is rated at 2.1V. So is it true that I should set +0.3V in the bios (which is highlighted in red!) and this would NOT be over-volting the memory?

This is causing some confusion between the Gigabyte and OCZ forums I think ...

Rgds/Alan

[HemiRick]

yes 1.8 is default and adding .3 gets you to 2.1V

[Lsdmeasap]

Correct, what HemiRick says.

[ajt]

I can get this to run with 6Gb, have some questions about that:

If I use 3 sticks of the memory, will the two paired in dual channel mode run at full speed. I presume the lone stick on it's own will be slower?

I could possibly use 2 sticks of this memory in another computer and buy another two 1 GB sticks. Would 2x2Gb + 2x1Gb (same memory other than size) provide any benefits over 3x2GB?

Rgds/Alan