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Question about adjusting speed from 1066 to 1600 ? for i7.

Last response: in Memory
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September 29, 2010 11:43:11 PM

Hi, Saturday morning I'll building my second pc. This what I got.

Core i7-950 3.06GHz Quad-Core
LGA 1366 P6X58D-E Mobo
CORSAIR XMS3 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model TR3X6G1600C8 G

Is how to manually adjust speed for ram ?

QUOTE
''The i7-900 series of chips only support a max. frequency of DDR3-1066, and if faster memory is used (such as DDR3-1333, DDR3-1600, etc.) it will be down-clocked to operate at 1066 MHz. So w/ a default BCLK of 133, the DRAM multiplier is automatically adjusted to x8 = DDR3-1066 (533MHz). In order to run DDR3-1600 at its rated frequency, the DRAM multiplier would need to be bumped to x12 for an effective DRAM frequency of 800MHz. You can use either enable the DDR3-1600 XMP Profile, which is programmed by the manufacturer into the SPD of each module, or manually adjust the four primary DRAM timings and voltage according to their rating at that frequency''

Do I just need to set the DRAM multiplier would need to be bumped to x12 for an effective DRAM frequency of 800MHz ? is this it cause this seems pretty simple.

This seems simple enough, now is this all I need to do to get my ram working at 1600 or do I have to adjust the voltage/timings ?

I've been reading up on this Core i7 cpu's and they only support ram rated speeds DDR3-800/1600. Can someone tell me if I manually put my ram at 8-8-8-24 @ 1.65 cause this is the advertised specs of the ram I bought, will that disable my i7 turbo & other stuff automaticly ? From what I read it does but can I go back to the bios and reenable the turbo & other stuff that it turned off ? but by reenabling turbo will it make the ram default back to 1066 ? and if so what then ?

Also should I try XMP first if so why ?

Sorry last question, By adjusting my ram to 1600 do I have to OC my cpu to because it will cause problems with the system like if I clock my RAM to 1600 then do I have to OC my cpu then to match or something like that ? Cause really don't even want to start thinking about OC'ing my cpu yet. thanks
a b } Memory
September 30, 2010 2:30:49 AM

Change the DRAM multiplier to x12. Then manually set your timings to 8-8-8-24 and V to 1.65V. If your Turbo and C-state and EIST settings are set to "Auto" switch them to Enabled.
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a c 104 } Memory
September 30, 2010 3:20:51 AM

Simple answer: Just let everything default and don't worry about it.

The reason is that the i7 has such a good ram controller that it can keep the cpu fed with ram data from any speed ram. The difference in real application performance or FPS(vs. synthetic benchmarks) is perhaps 1-3% . Not noticeable.

If you overclock, just gradually up the BCLK from 133 to 160 or so, leaving everything else on auto, and the ram should adjust itself properly.

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September 30, 2010 11:26:25 PM

ekoostik said:
Change the DRAM multiplier to x12. Then manually set your timings to 8-8-8-24 and V to 1.65V. If your Turbo and C-state and EIST settings are set to "Auto" switch them to Enabled.



If I change the DRAM multipler to x12, then I have to change the Uncore multiplier ?
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a b } Memory
October 1, 2010 3:05:38 AM

Why?
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