Does async FSB266/DDR333 improve performance?

[Surgeon]

I have an Athlon XP 2200+ with 266MHz FSB and DDR333 memory. I would
like to know if async mode FSB266/DDR333 is faster in any way than
266/266. My memory is CAS 2 at 266 and CAS 2.5 at 333, so the latency is
always the same, 7.5ns. What is the improvement then, if it takes the
same time to retrieve data either with ddr266 or ddr333?

 

[kony]

I have an Athlon XP 2200+ with 266MHz FSB and DDR333 memory. I would
like to know if async mode FSB266/DDR333 is faster in any way than
266/266. My memory is CAS 2 at 266 and CAS 2.5 at 333, so the latency is
always the same, 7.5ns. What is the improvement then, if it takes the
same time to retrieve data either with ddr266 or ddr333?

No, async mode is usually slower or at best the same performance.
However, most memory can be used at faster timings at the slower
mem bus speed so sync mode can reap even higher performance,
though you have to do a lot of testing to be sure you don't cause
memory errors with the lower timings (http://www.memtest86.com)

If your chipset supports DDR333 FSB, you would get best
performance from the higher FSB... set memory bus to sync DDR333,
and lower the CPU multiplier so it runs at same speed as it
would've on DDR266 FSB. If your board can't adjust the multipler
below 13X then you'd need do a socket or bridge mod, there are a
few examples at http://ocinside.de in the "workshop" section,
"AMD Socket A guides"