RAM speed in relation to CPU

  starslayer 11:39 10 Apr 03

Can someone please confirm for me that if I pick a new CPU with a FSB of 266 (ie. an Athlon XP 2100+) it's utterly pointless to buy memory that runs any faster (ie. pc 2700 DDR RAM)?

This is a good question.

I have PC2700 installed in my Asus AV7333 with an AMD XP 2000+ and have never really been able to determine whether there is any advantage in having the faster RAM.

I was speaking to someone recently abut this and they were of the impression that there is little or no noticeable difference betwenn PC2100 and PC2700 anyway.

  Paranoid Android 13:44 10 Apr 03

A 266 fsb mobo will clock the DDR ram at PC2100 equivalent speed.


  tenor 14:01 10 Apr 03

Depending on your motherboard,you can clock your processor to 166fsb and drop the multiplier to match the faster ram.I presently run a 2400 xp at 166x13,not overclocked but speeds up my 2700 memory considerably(sandra benchmark)

  Paranoid Android 16:39 11 Apr 03

True, I failed to consider overclocking because it's something I never do. Running at 2 X 166 FSB (333) would match up with with PC2600 DDR RAM.

However the question was about 266 FSB in which case what I said was correct.

Your risk.


  The Sack 17:08 11 Apr 03

The maximum bandwidth of an Athlon with a FSB of 266MHz is 2.1GB/s so if you bought PC2700 which has a maximum bandwith of 2.7GB/s you are just wasting the extra bandwith as Athlons work best when kept in sync with the RAM. However while RAM it cheap buy the fastest you can and run it at a lower speed to keep sync with the processor, then if you move to a faster CPU or OC you already have the RAM.

  MartinT-B 17:24 11 Apr 03

There is a 25-27% increase in speed between PC2100 and PC2700 running on the same PC set-up.

I'll search for the review. This involved no changes (overclocking, tweaking BIOS etc) at all on a PC with an Athlon 2400 Chip with a 266 FSB.

When changes were made to the Chip to 'time' it with the RAM there was even more of an increase.

I am about to test this myself.

I have an Athlon T'bred 2400+ (266 FSB)running @ 133 x 15 = 1995 or 2Ghz.

My RAM is 2 x 256MB of PC2700.

I am going to change it to 333 FSB which means my set-up will be 166 x 12 (1992 or 2Ghz) and will Post my results after the weekend.

  MartinT-B 17:30 11 Apr 03


click here

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