FSB Help!!

[xazos79]

Hi all, I'm building a PC for a cousin (pretty high spec one) and have decided to go for a DDR 333 board and pc2700 RAM. Now i've read all this debate about t-bred and barton sticking with a FSB of 133mhz. But then there are boards out that support 166mhz FSB.
Is it possible for me to have an XP2100 running with an FSB of 166mhz?

Hope someone can clear this up for me....

 

[jihiggs]

its possible, those 333 boards are 166 memory bus not cpu bus. you can still run an xp without having to raise the fsb for the cpu.

how do you shoot the devil in the back? what happens if you miss? -verbal

 

[xazos79]

Oh ok, so the cpu is completely independant from the memory bus. That makes it easier then.

 

[Crashman]

Kind of pointless though.

What's the frequency, Kenneth?

 

[xazos79]

How so? Wouldn't i want them to be separate so i can use the DDR333 memory? Am i missing something here? Should i not bother going for DDR333 memory for an AXP?

 

[Crashman]

The only benefit you get from using DDR333 on a DDR266 CPU bus is a slight reduction of latency which can give you maybe a 2% performance gain. When the memory bus exceeds the CPU bus in bandwidth, the CPU bus becomes the limitting factor.

What's the frequency, Kenneth?

 

[Sabertooth007]

If I remember correctly in one of Tom's newest guides, he stated that the P4 DDR motherboards do not exceed the maximum memory bandwidth/throughput of the CPU.

Here is the comment I am referring to:
"Here, you should keep in mind that the Intel Pentium 4 has a maximum bandwidth of 4.2 GB/s. In the near future, this will reach well over the 3 GHz limit. Only Rambus memory in the form of PC4200 (533 MHz) is capable of taking full advantage of this bandwidth. By using DDR SDRAM, such as DDR266 or DDR333, the bandwidth remains restricted to 2.1 GB/s and 2.7 GB/s, respectively. "

The link is as follows:
http://www.tomshardware.com/mainboard/02q2/020624/i850e-24.html

Tim

 

[PSK]

Quote
"If I remember correctly in one of Tom's newest guides, he stated that the P4 DDR motherboards do not exceed the maximum memory bandwidth/throughput of the CPU."

This thread is actually not concerning the P4 but the Athlon Xp cpu.