Question about the DRAM PCI CLK setting in BIOS

[MilkPowderR]

I heard that some of the new Intel mobos have DRAM CLK to run 33mhz faster, meaning adding 33mhz to the FSB currently running? This means a machine with a 133mhz FSB w/DRAM CLK at same mhz Vs. 100mhz FSB w/DRAM CLK being 33mhz faster will perform the same in memory throughput performance? what result you'll get in the Sandra Memory benchmark? Equal? or will the 133fsb with same DRAM CLK wil still outperform?.. Somebody pls give me input..

 

[Rand]

Many Via and Intel chipsets support running the memory bus anychronously with the FSB and hence running the memory bus at 133MHz while the FSB is at 100MHz. In terms of sheer theoretical memory bandwidth available both are equivalent but in the real world the 133MHz FSB adds it's own not so negligible performance benefit and so a true 133/133 solution does offer marginally higher bandwidth then a 100/133 solution. Still, the 100/133 is most definitely significantly faster then a typical 100/100 solution.

A synchronous memory/FSB clock does offer latency advantages over an asynchrous FSB/memory clock though, so 133MHz on a 100MHz FSB does not manage to lower overall latencies much from a 100/100 solution.

 

[MilkPowderR]

Thankx Rand =)