FX-55 and G.Skill LA's can't go above 220MHz

[WolfF]

Hi m8's

I Bought a F1-3200DSU2-512LA G.Skill RAM.

I've trouble to reach OCs above 220MHz (HTT or FSB). Memtest is OK but SuperPi Fails and Prime95

This is my rig:

MSI K8N Neo2 Platinum (January) nForce3 Ultra 250 (0452A2 Korea)
Athon 64 FX-55
PC Power & Cooling TurboCool 510Dlx
Cooled by Vapochill LS (-55°C Evap)

I've tried switch Command Rate T1 to T2, and only this way I can reach more than 220MHz but... the performance loss is substantial.

My OverClock Settings at BIOS are:
Cell Menu:
LDT = 4X
Agressive Timings = Disabled
Spread Spectrum = Disabled
NV/ATI Speed = Disabled
VDimm = 2.5V
CPU Ratio = 12
VCore = 1.500V

Ok and this is what I have tryed:
Other MSI Neo2 Mobo
Increase VDimm doesn't helps
Increase VCore doesn't helps
Down the LDT or HTT Multiplier to 3x, doesn't helps
Tryed each stick separately, both run on Single Channel at 310 T1 2.5-4-4-8.

I know that T1 on 300MHz and Dual Channel are hard to get, but... at 250?, I conform to 250 1:1 on T1, but I can't hit it.

This is a copy from a PM that I sent to OPB, but you know he's a busy person and you guys have a lot of experience, so... here I'm ready for your advise.

Thanks