Help reading p4 specs

[silentnswift]

hey, my dad gets old dells from his office to borrow when they do not use them. Recently we received a 1.7ghz Williamette. I am sort of new to this thing, but is your memory supposed to run at the same speed of your FSB? I am using SDRAM PC133 and the FSB is at 100. I am not sure if I am right... Correct me?

 

[ScHpAnKy]

hey, my dad gets old dells from his office to borrow when they do not use them. Recently we received a 1.7ghz Williamette. I am sort of new to this thing, but is your memory supposed to run at the same speed of your FSB? I am using SDRAM PC133 and the FSB is at 100. I am not sure if I am right... Correct me?

As long as the memory speed is the same or greater than the FSB of the CPU, you're good to go.

 

[pxc]

Memory speeds don't have to FSB match speeds. The Willamette P4 has a 100MHz QDR FSB. QDR = quad data rate, so 100MHz QDR = 400MHz effective speed.

Bleh, SDR memory. That must be the original Intel 845 chipset.

This has nothing to do with your original question, but i'll post it anyways. PC133 on a P4 is a huge bottleneck. PC133 memory has a 1.06GB/s bandwidth. The data bus on the 400MHz FSB P4 has 3.2GB/s bandwidth, so PC133 provides nowhere near enough memory bandwidth. Ideally, a 400MHz FSB P4 would use PC3200 DIMMs (single channel). That system predates intel's first DDR chipset, so it's not like there was a choice to put in a chipset and memory that didn't exist yet.

 

[silentnswift]

Ok thanks guys, but I was wondering, does AMD use any of these QDR things? Lol I have an Athlon XP at 2400+, but the motherboard was old enough to use SDRAM... So my FSB is at 133mhz, but what about that QDR thing? Does it apply to my AMD and cause a huge bottleneck like it does to a p4?

 

[ScHpAnKy]

Memory speeds don't have to FSB match speeds. The Willamette P4 has a 100MHz QDR FSB. QDR = quad data rate, so 100MHz QDR = 400MHz effective speed.

wrong, otherwise the ram runs out of spec, some can... most don't... unless you thought I meant total effective FSB... but he knows the difference judging from his original post. Once you understand the P4 is quad-pumped, AXP's are doubled and A64's run at 200... you know what type of ram to get and the FSB the memory runs at.