memory for the i7 920?

manisinghb

manisinghb

manisinghb

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hey guys what memory will be compatible with the i7 920 CPU and Gigabyte EX58-UD5 MOBO?? am looking at Corsair 6GB (3x2GB) 1600MHz? please do correct me if I'm wrong thanks...
 
Well that would be good. Except that memory is actually £126.99.

Also 1600MHz memory needs to be overclocked to get to 1600MHz.

If you're not comfortable with that, get 1333MHz memory which is just plug and play. 1333MHz memory is under DDR3 Tri-Channel - PC3-10600.
 
If your motherboard supports XMP then it's quite easy, you just find the option in the BIOS, select the XMP profile and the settings are applied.

No there isn't much between 1333MHz and 1600MHz.

XMP is Intels name for it. eXtreme Memory Profile and it's marketed at enthusiasts - techies and gamers who want the extra edge or bragging rights.

XMP also overclocks your CPU without you needing to do anything when it is used so everything is made a bit faster.
 
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The UD5 does support XMP. You don't need to use it to run the memory at 1600. Mine is running at 1600 without using XMP.

I've not heard of it doing anything to the cpu beyond increasing qpi voltage, what you you mean exactly Hotwired?
 
Take for example my i5 750:

Stock settings are:

FSB: 133MHz
Multiplier: 20x
CPU: 2660MHz
Memory is 666.5MHz/1333MHz

If I apply the XMP profile which is 800Mhz/1600Mhz it is changed to:

FSB: 160Mhz
Multi: 17x
CPU: 2720MHz

A boost of 60MHz but an overclock nevertheless.

I think but I'm not sure that the XMP profiles set the FSB to 1/5 of the memory speed or 1/10 if you look at the double rate. So as the XMP overclock increases so does the FSB.

So they lower the multiplier to keep the CPU clock from rocketing, it would go against the point of XMP to end up clocking the CPU slower so it's always a little above if it can't be exactly the same as stock.
 
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Fair play, I didn't know this. I'd like to say I'll check what it does on my system, but realistically I don't care enough :)
 
I didn't care much about it...

Then fiddled with it while annoyed because my 3.6GHz OC was misbehaving... and said sod it and OC'd to 4.2GHz.

Prime95 stable for half an hour which is 25 minutes more than my old 3.6GHz OC could take even though I'm sure that was stable originally, I know the cure for full stability at 4.2 and it's called 1.5V but I'm not happy to run at that voltage.

Then realised something, changed the multiplier from automatic (which meant it would go to x21) to manually set at x18 and increased the FSB from 160MHz to 190MHz same 3.6GHz CPU clock I wanted but the memory was now at 1600MHz instead of ~1700MHz when EPU-6 tries to jack up the overclock an extra notch in its Turbo mode - which previously meant the system becoming unstable as the other memory settings didn't like it.

The memory is underclocked below 1600MHz in normal use but heavy programs and games cause the EPU-6 turbo mode to kick in, goes from 1.6GHz to 3.6GHz and the memory goes from 1420MHz to 1600MHz. Stable for 6 hours and I'm happy again :)

So it can be a stepping stone of sorts into more involved overclocking.
 
I follow, that's a good use for it. Fair play to you.

I'm not very fond of some of the new tricks. Load line calibration, XMP, turbo mode, various other energy saving things. Perhaps that makes me slightly old fashioned, I'd rather have one bios profile for significantly undervolted, several cores turned off (I like this option) for when I want quiet, and a second overclocked one for when I want performance. I don't really trust changing frequencies on the fly, it feels too much like a source for instability to me. Not that I'm exactly pushing the boundaries at the moment at 4.00.
 
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