A wise idea to upgrade memory?

pgi947

pgi947

pgi947

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Hi all.

Recently moved over to X79 and started to overclock with my 3820 and 16GB (4x4GB) 1600mhz vengeance memory on a UD7.

From what I have gathered once I start playing with the BCLK I have to start adjusting the memory to suit.

Firstly I have a couple of questions about my current memory, I don't know a great deal about memory but I figure I will have to learn at some point. The default XMP timings are 9-9-9-24-2T, the profile stated tRFC is 48. When I switch to XMP on the motherboard the timings switch to 9-9-11-24-1T with a tRFC of 138 - do these sound drastically wrong? Also CPUZ states the quad speed is 800mhz, surely this should be 400mhz in quad channel?

Also while playing with the BCLK I ended up at 1666mhz, gave it a little nudge on voltage to 1.55v from 1.5v and windows insta-crashes even with no CPU OC.

SO am I doing something wrong or missed a setting to help keep things stable?

Starting to think life would be easier with some of the samsung green memory as I shouldn't need much of a voltage nudge to apply light clocks to the memory.

Thanks in advance :D

Edit: Some info today would be brilliant as the samsung green is down to £90 for 16GB today only!
 
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Ahh all this time I thought the speed shown was representative of the number of channels. That's one thing explained then :)
 
Ok so I've been having a play in the bios this morning as well as some reading up on memory timings! A little more educated than I was yesterday but could still do with some pointers.

Managed to set 4.625ghz with a 100.00 base, 1.25x strap, 37x MP, set memory voltage to 1.6v, manual timings of 10-9-10-25-1T running at 1666mhz from the multiplier, the tRFC clock is now set 144, with tRFC lower = faster, higher = stability?

I did coincidently manage to set (by accident I might add) the memory to 2000mhz with timings of 12-10-12-35-1T @ 1.6v - are these timings too slack, or do I have at least some hope of not buying some new memory?

Edit: Note I may be able to get the higher speed timings tighter, I haven't tried at all yet, I left something on auto and it manually set to those timings for 2000mhz, speed is not important but keeping decent timings while clocking the CPU is for me.
 
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What would you deem as too high? I'd be happy enough pushing 1.65v, any higher than that I may as well look at picking up some of the samsung green stuff :)

Edit: also, those timings, is that for 1666 or 2000?
 
Cheers:

Maxxmem & Aida64 benches:

aida64.jpg


MaxxMEM2_f1536.jpg


This is for current settings/timings for 1666mhz.
 
That was at 1.6v, iirc I tried 1.55v yesterday but with automatic timings (so no idea what they were set at as the system crashed before I could check).

So would a good place to start be to tighten down the timings @ 1666mhz (current) or leave the timings and try raise the speed?

Seems a good place to start on the memory, at least then I will know where I stand on heavier overclocks.
 
Now at 9-9-9-24-1T at 1666mhz 1.6v

Seems I may not need new memory after all :)

new_aida64.jpg


I could try dropping the memory voltage a little. Happy enough with 1666mhz as thats full speed on a 1.25x strap :D
 
Ok just trying out 2000mhz (its the next logical speed on a 16x memory multiplier) with 11-11-11-32-2T @1.6v still, latency as gone back up, but read has increased:

2000_aida.jpg


Would a good idea with 2000mhz be to aim for something along the lines of 11-10-11-30?
 
Haha I spoke too soon!

The above settings for 2000mhz instantly killed my machine as soon as I started to prime.

I'll stick to tweaking 1666mhz just now :)

Thanks AGAIN for your help wazza, you're a credit to the forums :)
 
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