Question about FSB

[DaNewOne]

I have a quick question about the FSB of the higher ram. They have for instance on a 4200 they have 533 MHz and the all the mobos say DDR400 does this mean that the extra 133MHz is pointless. Should i just go down to like the 3700 or the 3200?

 

[Crashman]

A 4200 what? I don't see any 4200MHz or 4200+ processors on the market.

<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>

 

[ytoledano]

No mobo officialy supports anything higher than PC3200/DDR400 since it's not a JEDEC standard, what it means is that there are no processors that run at higher speeds, according to their specs. Overclocking is running processors over their specs so then you might consider faster memory, many motherboards support this.

Abit IS7 @ 275 FSB, OCZ PC4200 RAM @ 550Mhz, P4 2.4 @ 3.3Ghz Vcore @ 1.625, Sapphire Radeon 9800P @ 410/780.
Thermalright SLK-947U, P3 HS @ NB.

 

[Obtuse]

Also, keep in mind that these speeds are not actual speeds. The Front Side Bus of the Motherboard is a number like 133, 166, or 200 MHZ. Intel motherboards use a X4 multiplier to get a higher one. So one an intel board, you might see 533 FSB (133 FSB X 4) or 800 FSB (200 FSB X 4). The RAM, however, is double data rate, meaning it goes off a 2X multiplier of the FSB. So DDR400 is designed to use a 200 FSB (200 X 2 = 400). You always want RAM designed for your front side bus speed or higher. So 533 FSB would want DDR 266 or better, and a 800 FSB would take DDR400 or better. AMD mobos do the same thing but they only double the FSB, so if you had an AMD mobo with 400 FSB (200 X 2), you would need DDR 400 (also 200 FSB X 2).

 

[Cybercraig]

Very well put!


"I am become death, the destroyer of worlds. Now, let's eat!