Originally Posted by RX7-2nr
You mentioned that you've always had stability problems with your 4ghz overclock. I asked if you had tried configurations that would bring your baseclock down to a more reasonable level. I asked this because of the exact reasons you mention in your post- High QPI and buggy instability. I'm not asking to debate the merits of your choices lol, that's a bit overdramatic. 211x19 has got to be one of the more awkward I've seen recommended for 4ghz on a bloomfield and I'm curious what led you that way. Generally speaking you want to make as much use of your CPU's multipliers as possible.
My friend I was either not clear in my post or you did not read it all.
I have achieved stability. The 211 bclk was never the problem. It was having the QPI link freq the same as the NB freq in my case. I had been using a x18 multi for the NB. I reduced it to x16 and all fell into place. x16 puts NB exactly at x2 the ram freq.
I also mentioned that I tried the 200 bclk, it did not work because with that base bclk to get ram to 2000MHz meant that the NB freq became greater than the QPI link freq, which is a no no with the X58.
I was just trying to give the op my approach to getting a 4.0GHz OC for the cpu. There are quite a few OC tutorials out there that use a 211 bclk. The x20 multi for cpu is also considered unstable. To use the x21 requires turbo mode enabled with my mobo, which also means that turbo mode will not engage until system is pushed. x21 with a low bclk does not get you much past 4.0GHz. Because of the relationships with a QPI mobo, you cannot use ram at 2000MHz unless you use a bclk lower than 200. Below 200 is key for higher ram speeds. My mobo's highest cpu multi is x21, so the trade off is 4.0GHz cpu or 2000MHz ram cannot have both. If you know something I do not, pm me with your technique to get both. Glad to learn more.
Believe me, I looked at many tutorials, tried many things. The op was debating a new system because he could not get to 4 GHz with his X58. I just relayed what my readings on google showed me.
Not trying to be dramatic, just trying not to co op the thread.
Bottom line, as QPI freq approaches 8 GTS, instability. As the QPI link freq approaches a 1:1 ratio with NB freq, instability. The cpu-z pic shows what is stable for my mobo.
211 bclk x19=4.008GHz cpu, 211x8=1668MHz ram, uncore 211x16=3375.xxMHz NB, 211 x36= 7596GTS divide by 2 =3798.xx MHz QPI Link, + various volt changes worked for me.Edited by spiney - 4/21/14 at 5:26pm