Any difference between DFI nF4 board's?

[Dani]

I mean difference in HTT overclocking.
My new Ultra-D R.AB0 cant handle +325HTT, LDT/HTT voltage dont help

4000+ SD can do 2944MHz SP8M, my KHX3500 DW50 2225 1T DC 1:1 271FSB SP8M thruogh but not +325HTT*4-9
Tested lots of BIOSes, no go.
Temps are ok.

My old Ultra-D R.A02 did +370HTT

I read from an other thread that NEW Ultra-D is worst, SLI-D good and SLI-DR best, I'm talking about NEW boards with R.ABO revision and HTT OC

Sorry my horrible english

Here is the photo of that revision, its somewhere between PCI slots