Newbie question: 266 fsb is really 133? I don't get it.

[The_Ryz_Factor]

OK I read all over web sites when buying a T-Bird it says 266 FSB, but how come here in these forums people say they are running it at 133? Does it have some relation to the RAM, because I've noticed that RAM is usually PC 133 but being DDR, it runs like it is 266. So does the FSB have some kind of relation to the RAM? Please explain it to me. ;) Thanks d00ds and d00dettes.

The_Ryz_Factor

[It_The_Cow]

Yep, it has to do with the RAM. DDR stands for double data rate. So if it is labeled pc133, it runs at a DDR speed of 266, and pc100 at 200

[Beav]

Well...actually, the FSB doesn't necessarily have anything to do with the memory. They are independent, but in the past they were usually set at the same speed. Now in most cases they are asynchronous, meaning the FSB and memory bus do not have to be the same. Most people call it a 266MHz FSB, but it really runs at 133MHz. They get 266 from the fact that data is transferred twice per clock cycle, making it effectively a 266MHz FSB. DDR works the same way.

[plague]

It_The_Cow (Jul 15, 2001 07:15 p.m.):
Yep, it has to do with the RAM. DDR stands for double data rate. So if it is labeled pc133, it runs at a DDR speed of 266, and pc100 at 200

dont wanna confuse him...pc133 runs at 133 mhz and pc100 runs at 100 mhz, they arent DDR. You need PC2100, or PC1600, which are DDR and run at 266 and 200, respectively.