I'm confused as to what the LDT is and does on A64 kit. Now I've finally got the time I'm starting to OC my machine but would prefer to understand this so I can get the most out of it. I am aware that the HTT is essentially the "FSB" but what exactly is the LDT? And can I gain from pushing it up higher? I read somewhere that ideally (LDTxHTT)x2 should equal less than 1800, if so, why? I was quite happily climbing up through the MHz until my HTT got stuck at 275 and wouldn't behave properly past that, will a bit of properly understood LDT tweaking help me past this barrier? Any help appreciated.