p55 classy 2:8 210bclk = failsauce

[Splave]

*water cooling*
Ive been trying everything, R-W 10 W-R 10 TWR loose TRFC 88+. Followed all the settings posted here too no luck. Chips are 2x670 and 1x661 and fails at 210bclk no matter if cpu multi is x17 x18 x19 x20. Any time ram is over 1650 or so it gets flaky. IC's are hyper 2x1gb kit on mem. QPI is 3.2 any thoughts? 2:8 would be amazing and im trying to get it hammered down before I put it under cold.

Also is the cold mod making things unstable for water?

[Raja@ASUS]

Might be your IMC - see those 661 screenshots I posted with the tight R-W's in Sham's thread? I have a retail 540 here that cannot get close to doing that. The 540 gets to around 230 BCLK and can't handle much more at those timings (that's at -100). Not sure if there's anything else you can try apart from changing the DIMM slot location. Goig cold will help you a bit I suspect. Might be worth showing a CPU Tweaker screenshot if you can...

I don't think the PEGR BIAS mod will hurt your stability per se at ambient, although I tend to reverse the mod myself when the board is at ambient (long term effects on the Tx stages may not be good).

regards
Raja

[Splave]

thanks raja after studying the other thread a bit harder your idea of increasing everything after command rate to 12 was all that I need along with a bit looser subtimings.
Now running 8 8 8 24 88, 2100mhz just have to tighten it down a bit but a great starting point!

Cheers you're an asset to these boards very helpful!

[BenchZowner]

Must be a CPU or board "thing".
I had the same "issue" with the P55 200 Classified and 2* i5 670's and an i3 540.
The 2:8 div worked only up to 180MHz BCLK +/-10MHz.
Had to bench with the 2:6 div

On the P55A-UD7 both my good i5 670 and the 540 could run up to 210MHz BCLK with the 2:10, and up to 240MHz BCLK with the 2:8 ( didn't test the 2nd i5 670 ).

I dunno...

[Splave]

very weird, makes it hard to pifast and superpi at 2:6 cas 5. Will have to try my 6.6ghz 661 chip and new 670 at 2:8 now and see what I can get on cold. will update.

[Raja@ASUS]

That's weird. The board I have here will post at 220~225 BCLK from BIOS with 2:8 and high QPI (with the sub-timings setup right). After that I just use E-Leet or EVbot to clock up.