1T, 2T what the hell

[JAG87]

like the topic says, will 4 modules of lets say 1GB DDR2 memory run at 2T? or does this rule just apply to DDR ram? I am in the quest for 4GB of DDR2-667 ram, and currently there is no way to obtain this other then 4 x 1GB. There are no 2GB modules of PC5400 ram yet.

no crapping about how much or little better 4GB is then 2 please!

 

[stevty2889]

The rule applies to A64's, which currently can not use DDR-2. DDR and DDR2 are not interchangable.

 

[JAG87]

so wait, with intel and ddr2 the 2T crap doesnt apply? do you think that when am2 is out, this will stand for A64 as well? or will the 2T problem persist on A64 even with DDR2?

thanks for any answers

 

[Vegito]

Can't answer question on stuff we dont own for another 6-10 months.

 

[Mday]

Originally posted by: JAG87
so wait, with intel and ddr2 the 2T crap doesnt apply? do you think that when am2 is out, this will stand for A64 as well? or will the 2T problem persist on A64 even with DDR2?

thanks for any answers

The problem persists, and is not really the fault of the processors. 1T is fairly simple to obtain. When you throw in a larger overhead with 4 sticks, you make it harder. And when you consider that cost saving measures to make systems use unbuffered and unregistered memory, you pretty much lose your capability to maintain that timing when you scale up (depends on how this term is interpreted). Timing is a big issue with modern systems. You need more logic to keep things in synch with each other.

 

[wseyller]

loss of real world performance from 2T rate compared to 1T is only 1 to 3% in most cases. It's better to have the extra memory if needed then try to avoid 2T.

 

[JAG87]

so best to keep only 2 modules right?

techincally it would be better 2 x 1024 than 4 x 1024?

of course 2 x 2048 is my goal, but until they come out with 667 mhz kits like that I cant do it.

 

[ribbon13]

Intel still use chipset RAM controllers. AM2 with an onboard DDR2 RAM controller chances of addressing 8 ranks of RAM in 1T mode are at least a lot higher than DDR because DDR2 is a newer more tolerant technology. DDR2's advancements aren't limited to higher-speeds with looser timings.

 

[JAG87]

so yes and no?
i guess we dont really know how 4 ram sticks will perform on an A64 platform..
oh well lets wait and see