E6550 despite the BSEL Mod on the same 800 MHz-did not work, the board stopped at POST-code 04.

18 hours ago, ludek said:

try to make shure if FSB:PCIe ratio is always 3 +/-5%

Yeah, keeping PCI-E sync to FSB really helps for those 9x5 chipsets.

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4 hours ago, Antinomy SAYS: Yeah, keeping PCI-E sync to FSB really helps for those 9x5 chipsets.

On this board, an attempt to fix the PCI-E frequency results in a hang on POST code 04. So I just left it on "Auto". In this mode, after ~265MHz, perhaps a little later, problems with the video card begin, but as you can see, this did not particularly bother me)