yes it matters,,if your ram cant run at 133 you cant run period.......some 100mhz can run above 100mhz....like i am running at 112mhz on my p3500, but i cant run at 124.....if i had 133mhz ram, i might be able to.....there are may factors in o/cing and if you cant run at what you want you need to try out diff things.....
My P3 500 can only support up to 115, never succeed to reach 120, 124 etc.. with my PC100 ram. However, when I trade in the above for the P3 450, I reach 133 now with the same PC100 ram. I can even reach 140 but the system is not stable.
I've got generic PC100 to run at 133fsb 100% stable, It will go to 138 but I get errors in Wyn Doze. Make sure you have sufficient cooling for your CPU and case and try 133 with a quarter pci divider. Mine would not work at 124 but that was because the PCI clock was running to high. Here is an example, processor at(3.5X100 350mhz) a third divider gives 33mhz and it remains at 33 with (3.5X133 467mhz) at a quarter divider.
Give it a try it works for me.
Mine will run just fine at (3.5X135 472mhz) but my modem keeps disconnecting! Weird!!
PC 133 is not the be all and end all as it varies, HSDRAM is the best and Corsair also, but it can be luck of the draw as to how much above 133 you will be able to get. anything above 140 ish will probably make you AGP graphics card start to get really upset as well.
I'm currently building a new PC with a Coppermine that will hopefully go to somewhere near a gig with a Peltier,Alpha and Corsair 133...........BladeRunner
It's funny you should mention that Softwarezguy, as I couldn't get the Corsair ram so I've got, (or I will have when it arrives), Mushkin 256mb PC133 5ns SDRAM, The specs sound good for a BX board, we'll see how it shapes up.
Also Superdigg, I've got an Abit BF6 mobo, which allows fsb speeds in increments of 1mhz up to 200 so you can squeze the last little bit out of the system.
I still think the AGP clock is going to be the biggest problem. But at the moment it's the processor that's giving the headache.
The 700E PIII is still not available here yet, and I would need to get a 143mhz fsb to get the Gig! The fact that slightly under or slightly over a Gig you are not going to notice, but you just know how annoying it would be to top out at 998mhz!! ARRGH
Anyhow I'm not sure at the moment but it needs to be 100% stable or there is no point. I'll keep you posted if you are interested.....BladeRunner.