Ram Versus Fsb

[thomas111]

Hi!

I`m going to buy an MSI RS480M2 amd64 3000 with 1000Mhz Fsb, heard about using ram speeds identical to the fsb.. Suports ddr400 with 200Mhz, 4 slots and dual memory. How could this add up?? Should i underclock fsb to 800mhz and do i need 4x200 Mhz ram`s??

[ir_cow]

you need to lern more about computers before you go and buy ram that wont do anything, 4400 is all you need, it will run at 3200speeds b/c thats 200mhz bus of AMD64's but once you OC your ram can handle it.

 

2x200 is still 200

4x200 is still 200

 

that 1000 thing is for P4's i think.

Edited May 26, 2005 by hornybluecow

[bdylyzsouless]

no the 1000Mhz is from the ht multiplier on the 64 systems

[thomas111]

quote: you need to lern more about computers before you go and buy ram that wont do anything, 4400 is all you need, it will run at 3200speeds b/c thats 200mhz bus of AMD64's but once you OC your ram can handle it.

 

2x200 is still 200

4x200 is still 200

 

that 1000 thing is for P4's i think.

 

 

??? :-)

 

ddr333=pc2700 167Mhzx2=333

ddr400=pc3200 200Mhzx2=400

 

And right as i read in anothere forum: The Fsb on Amd64 3000 prosossors is given

200Mhz times multiplicator 5 gives an fsb on 1000Mhz. As the product guide says!

[r_target]

For our purposes it's best to deal with the 200 Mhz HTT/FSB speed. The HyperTransport (HTT) multiplier is best set to equal as close to 1000 as possible without exceeding it. At least until you see what the motherboard can do.

 

For example:

 

Stock speed HTT on Athlon 64 is 200 Mhz. So PC3200 would match this speed (PC3200=DDR400=200 Mhz), and your HTT clock speed x the "5" HTT multiplier results in the 1000 Mhz HTT speed. Now, let's say you had some PC4000 RAM, which runs at DDR500 or 250 Mhz (note: all RAM can run any speed up to and sometimes exceeding it's rated speed). With PC4000, you can clock the HTT to 250 Mhz, thus overclocking your CPU and technically clocking your RAM at it's rated speed.

However, with a HTT speed of 250 Mhz x 5 HTT multiplier, you now have a final HTT speed of 1250, which is usually too high for the motherboard. So you'd have to drop the HTT multiplier to x4 (250x4= you guessed it, 1000).

 

 

 

Anyway, like I said, just keep an eye on the final HTT speed being around 1000 Mhz and then forget about it. The 200 Mhz speed is the one that matters.

[thomas111]

 

Wow, you realy blow my mind off, now realy beginning to understand this :-)

 

The mainboard i`m bying is not good at overclocking, as guzzidom said it support no overclocking at all. It supports up to pc3200 ram, but is it anyway possible to use pc4000 anyway?? or is the multipler then locked.

 

Also trying to find out if the board supports rams that is not specified on msi`s site. Specially to use 1Gb ram chips and if the dual then are supported! Only get sendt the list over supported ram`s but no answer, this is poor i think and because of this i am unsure of buying this board! But I`ts mayby not anything better at other producers support??

[noseeme]

Heh heh. Not to worry.

The CPU FSB and clock speed of the ram can be configured together in ratios. This system started to be widely used once the FSB of processors became much faster than the speed that RAM could handle. If you run the FSB at 1000, you can create a ratio that will adjust the clock of the RAM automatically, to something like DDR-333 or DDR-500.

[thomas111]

 

Laughing at me?? ;-) hehe

It takes some effort to get info in the net.. or at the producers..

 

But can i use ddr500 or 1Gb rams on this mobo?? Even though the card only support up to ddr400??

[mikey390]

Since this is not in any way a hard-core motherboard for enthusiasts, there are precious few tweaking options in the BIOS. You cannot adjust the CPU's external frequency (FSB) or multiplier, and there are no real voltage options.

That quote was taken from here. Its a review of your mobo.

 

Since you can't overclock with that mobo, I don't know why you would want to buy ddr500 for it. Also, do you really need 2GB of ram. If not, just buy 2x512.

[thomas111]

 

Your probably right <_< , thought about 2Gb Ram because of deactivating the paging file. Ram faster than paging on harddisc, and 512Mb and 1Gb is about the same price pr Mb. Could easier ugrade to 4gb of ram if this is needed in the future. But probably i will not ever need more than 2Gb of ram on this Mobo anyway! Using this pc as a multitasking tool: Server, movies (download 10Mbit/s, watching), ripping, defragmentation, whatever. Nice to be able to do this all at the same time

Edited May 29, 2005 by thomas111