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question about DRAM frequency

Post Date: 2010-04-22
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jrjohnson735 View Drop Down
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Posts: 11 		  Quote jrjohnson735 Quote  Post ReplyReply bullet Topic: question about DRAM frequency
    Posted: 22 Apr 2010 at 11:55pm
Well i just recently built my own computer. its an i7 build, and ive noticed in boot up it says somthing along the lines of DDR3-1066 and this is bothers me becuase i have DDR3-1600. now correct me if im wrong but i thought the 1600 was the frequency. so anywaus ive gone into bios and DRAM frequency is set to auto. ive previous tryed to change that to 1600 but computer crashed after a minute or so. well recently i have gone back and looked at it again and have noticed below that there is a UCLK frequency, or i believe it was called that. now this says UCLK must be set to twice as much as DRAM frequency. So if i were to change my DRAM freqency to 1600 and the UCLK thing to 3200 would this correct my issue? any info would my GREATLY appreciated =)
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AndydViking View Drop Down
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Posts: 733 		  Quote AndydViking Quote  Post ReplyReply bullet Posted: 23 Apr 2010 at 1:12am
Bios won't always report correct ram frequency.  What motherboard do you have?
I ask what mobo because EVGA gives a projected RAM frequency in the bios.
 
Download CPU-Z http://www.cpuid.com/download/cpuz/cpuz_154_setup.exe and click the memory tab.  Look at Dram frequency and it should be half of what you want (because it's double data rate ram). If it is still low you will need to bump up the FSB:Dram ratio in the bios.
 
Also you will not get your ram to go to 1600 unless you overclock your CPU. i7 natively runs 1333mhz.
 
keep in mind I'm a noob but I think everything I just told you is right on. lol
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jrjohnson735 View Drop Down
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Posts: 11 		  Quote jrjohnson735 Quote  Post ReplyReply bullet Posted: 23 Apr 2010 at 1:58am
well thank you very much for your info but i think i actually stumbled across the solution. I have an AsusX58D Premium, and the the memory i have have is crossair dominator ram. i did some looken in the manual and online and i came across this X.M.P mode. when turned on it seemed to automatically bump the specs up to where they should be. seems to be stable and geting better FPS in games. lol only issue now is it has raised my CPU temps. the temps still seem to be safe never geting over 70c when running a few games. im still thinkn that upgrading my stock cooler would be a good idea thow. any recomendations? and if anyone could tell me a little about this X.M.P mode that would be awsome. just curious how it works.
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AndydViking View Drop Down
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Posts: 733 		  Quote AndydViking Quote  Post ReplyReply bullet Posted: 23 Apr 2010 at 3:14pm
from what I can gather X.M.P mode adjusts you FSB speed up and lowers your multiplier to get the memory to the 1600 spec.  That should prolly make the cpu run a bit hotter because your front side bus is faster so I'm thinking thats normal.  IMHO I would not use that and manually set you memory timings.  You will not notice the difference between 1333 and 1600 I'm guesing.  Then of course you'll have the overhead should you decide to overclock later.
 
Hope some more experienced people will chime in to help with the XMP profile stuff. 
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 23 Apr 2010 at 3:35pm
XMP profile is a "dummy" overclock, it usually works, but is far from a custom overclock, I have never used it for an overclock, only used it to see what it did.
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AndydViking View Drop Down
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Posts: 733 		  Quote AndydViking Quote  Post ReplyReply bullet Posted: 23 Apr 2010 at 3:48pm
Justin do you agree he should prolly just manually enter his stuff in and get stable at stock first then proceed with a custom OC from there?  That's kinda what I was trying to tell him to do.
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 23 Apr 2010 at 4:07pm
well, yes it is better to manually enter them, but it also takes more time, to find out what is stable and what is not, RAM timings can take a long time, some rigs I have spents months trying to get all the RAM timings set to optimum settings.
The XMP, won't be the best way, but it should work.
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jrjohnson735 View Drop Down
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Posts: 11 		  Quote jrjohnson735 Quote  Post ReplyReply bullet Posted: 23 Apr 2010 at 5:05pm
hmm well i appreciate all the info you guys have shared with me. but unforudently im not to familier with everything in the bios. lol im kinda of tryn to learn as i go without screwn stuff up. as for overclocking im not to concerned with that as much as i am just wanting to get my computer to be running at the specs it should be. as for the X.M.P mode would you guys consider that safe or no?
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 23 Apr 2010 at 5:45pm
usually is, sometimes it bumps the voltages up a little higher than needed, because it is designed to work with all CPU's, and not yours specifically.
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jrjohnson735 View Drop Down
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Posts: 11 		  Quote jrjohnson735 Quote  Post ReplyReply bullet Posted: 24 Apr 2010 at 4:15pm
ok well thats good to know.. so say i wanted to turn off X.M.P... in order for me to get my ram to 1600 i would have to overclock my cpu to 1600mhz?? how would i do this and is it safe with just stock cooler?
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 24 Apr 2010 at 8:06pm
no need to overclock, you can use a RAM multi of 12 to get 1600 Mhz RAM speed, and stock CPU speed
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