1T and 2T

[poggy]

Hi all I hope you can clear something up for me. I have 2 sets of dual channel ocz mem and i'm trying to change the Command Ratet, one set is 1t and the other is 2t, individually i can change both to 1t but when i have all four sticks in if i've set it to 1t in the bios it just craps out and only works if i set it to 2t.

So my question is if i get another set of ocz with 1t can i run this with four stick or is it just tough luck and you can only have 2t with four sticks?

Thanks
Poggy

 

[Cob]

Which board and which memory?

Four sticks usually need to be set to 2T.

 

[poggy]

Hi it's a Abit AN-M2HD. 2 sticks of OCZ PC2 5700 and 2 stick just recently bought from here OCZ PC2-6400.

I thought thats what it was, not matter if both are 1t if you have 4 sticks you can only get 2t.

Thanks for the reply

Poggy

 

[WJA96]

The 1T and 2T refer to the number of Front Side Bus (FSB) clock cycles the ram needs to refresh in.

The fastest RAM I currently own (Ballistix PC8500) can refresh itself in one clock cycle (1T) all the way up to 230MHz FSB (460MHz Intel clockspeed, 920MHz actual RAM speed).

That's great, but only one of my motherboards (Abit QuadGT) has ever supported 1T that fast. Most of the Intel chipset boards struggle with 1T over PC5300 speeds, and it's only the most recent P35 series boards that support it natively anyway.

If you want to run 1T with fast RAM you need an NVidia chipset board as that uses the AMD HTT memory control method, albeit in the chipset rather than on the CPU itself.

I've never had a motherboard that would run 1T with 4 sticks of RAM, but it is theoretically possible, just not easy. If I had to guess which currently available boards might do it, I'd be looking at the Abit X38, DFI P35 or NVidia 680i boards, as the Intel chipset boards have all been 'breathed on' by engineers who appreciate the subtleties of performance and the NVidia is the best memory controller on the market at the moment, in my opinion, of course.