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Question about memory (Read 721 times)

Reply #15 - Jan 10^th, 2009 at 2:04pm

NickN Offline
Colonel
FSX runs fine... the problem
is you or your system

Posts: 6317

NickN wrote on Jan 10^th, 2009 at 2:00pm:

No worries

you wont go into any danger zone till you hit 1.69-1.70

If the memory (with and without) the CPU overclocked will run 1.64-1.65, leave it there. Many SPD's (the memory chip programming on the sticks) are setting this to 1.66 which is not a problem and why I suggested it

if its stable at 1.64, its fine. Lower is always better

Now with QPI/DRAM voltage lower is always better is not quite true.. It must be within .5v of the DRAM voltage and during a clock 1.35 seems to be the sweetspot for that, which again most SPD's are setting that value to

follow up...

just so you understand.. DDR3 memory itself will run up to 2.0v DRAM without a problem.. with i7 though the DRAM voltage is not only seen by the memory, its seen by the CPU and therefore the danger in raising it past 1.69-1.70 is to the CPU, not the memory

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Reply #16 - Jan 10^th, 2009 at 7:35pm

JimBrown Offline
Colonel
Always remember, have
fun first!
Rockland, Ontario, Canada

Gender:
Posts: 44

More great information.

If I may jump in on this thread (and if I mayn't, let me know and I'll go start another.

)

I've been playing with my brand new i7 920 system all day, getting to know it as intimately as I can. (So far, I think all we are doing is kissing.)

Like jwenham, my RAM appears to be running at less than it's rated speed and timings. I have the Mushkin XP3-12800 3x2gb kit. It is rated for 1600 at 7-8-7-20. When I fired up cpu-z (1.49), it showed the memory running at 1066 (533 x 2) at 8-8-8-20.

Since I do not want to OC the rig at this time, whilst I install and tweak the OS and software (including FSX) but I still want to take advantage of the faster RAM speed, I went into the ASUS P6T Deluxe BIOS and changed the following:

DRAM Frequency 1600
UCLK Frequency 3200
DRAM CAS# Latency 7
DRAM RAS# to CAS# Delay 8
DRAM RAS# PRE Time 7
DRAM RAS# ACT Time 20

Have I made the changes correctly? Cpu-z now shows the RAM correctly.

I am aware that when I do OC the system, the two Frequency settings will need to be adjusted.

And, if I may, and while I have your attention, I also made the following changes in the BIOS:

Intel SpeedStep Tech Disabled
Intel Turbo Mode Tech Disabled
CPU Spread Spectrum Disabled
PCI Spread Spectrum Disabled
C1E Support Disabled
Intel Virtualization Tech Disabled
CPU TM Function Disabled
Intel HT Technology Disabled
Intel C-STATE Tech Enabled
ACPI 2.0 Support Enabled

Have I changed anything I shouldn't have? Have I missed anything?

Much thanks!
...jim

Intel i7 920 2.67 OC'd to 4.0ghz&&Asus P6T Deluxe&&6gb Mushkin 1600 7-8-7-20&&BFG 260 Maxcore OC'd 20%&&Thermalright Ultimate Extreme 120&&Power PC & Cooling 750w&&650gb Western Digital 32mb&&TripleHead2Go at 3840x1024&&A wife who doesn't give me any grief about this silliness.&&&&Radio Control Aircraft Gallery

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Reply #17 - Jan 10^th, 2009 at 7:57pm

NickN Offline
Colonel
FSX runs fine... the problem
is you or your system

Posts: 6317

Looks good Jim

you can disable ACPI 2.0 Support unless you have very old PCI cards in the system

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