What is lowest speed ram for stock at 1:1 for x2?

[crspyjohn]

What is lowest speed ram for stock at 1:1 for x2? Do i need 500mhz ram to run at 1:1?

[doompc]

You need DDR2-4000 (2000MHz DDR) to run 1:1 on a 2GHz A64.

There is no 1:1, cause there is no FSB, whatever memory you have will be running 1:1 itself.

So it's disireble to have the fastest memory available, but A64s are not bandwidth hangry CPUs, any "value" DDR2-800 will run just fine, a little faster than a 939 one with DDR400.

[ozzimark]

assuming you're referring to the memory ratio set in the bios, 1:1 will almost always give 200mhz ram speed, or slightly less if you're using a 1/2 multi... so ddr400 or ddr2-400 is the lowest ram speed for 1:1 whether it's 939 or AM2 :D

[crspyjohn]

You need DDR2-4000 (2000MHz DDR) to run 1:1 on a 2GHz A64.

There is no 1:1, cause there is no FSB, whatever memory you have will be running 1:1 itself.

So it's disireble to have the fastest memory available, but A64s are not bandwidth hangry CPUs, any "value" DDR2-800 will run just fine, a little faster than a 939 one with DDR400.

I think your wrong there doompc. I was sleepy but now I remember correctly lol, to have ram run at 1:1 is whatever FSB is at times 2.

[doompc]

A64 has no FSB, the CPU talks to the memory controller at core speed, then the memory frequency will is generated dividing "CPU CLOCK" by the "memory clock divider", wich has to be an integer number.

If you select DDR400/DDR2-400 Memory Frequency, the memory will run at the same frequency as the "base"/htt/fsb clock, because the memory divider is equal to the cpu multiplier. But it doen't matter at all.

You may have the memory running at lower or higher frequency than the base clock, it won't affect performance, the memory frequency will.

Exemple:
CPU Multiplier = 10x
Base clock = 200MHz
Memory Divider = DDR400 (for 10x multiplier it's CPU/10)
So, memory frequency will be 200MHz.

or

CPU Multiplier = 8x
Base clock = 250MHz
8x250=2000
Memory Frequency = DDR333 (for 8x it's CPU/10)
2000/10 = 200MHz too

If you set the same memory timings (about 20 settings) you will have exactly the same performance on both settings.

10x200 DDR500 (CPU/8) and 8x250 DDR400 (CPU/10) will also perform the same.

There are little diferences if you don't set all memory timings equal, because the AUTO settings are diferent for DDR333 and DDR400.

Read nn_step messeges here:
http://www.xtremesystems.org/forums/showthread.php?t=132536

[afireinside]

If you want to run "1:1" htt:ram you'll need the same divider as your CPU multi.

[xploit]

If you want to run "1:1" htt:ram you'll need the same divider as your CPU multi.

what divider would be need for this setting? (to make it 1:1)

http://i122.photobucket.com/albums/o270/violentfusion/300fsb.jpg

[crspyjohn]

600mhz ram

[Schmetterling]

what divider would be need for this setting? (to make it 1:1)

http://i122.photobucket.com/albums/o270/violentfusion/300fsb.jpg

Search for a set of memory with Samsung TCCD/TCC5 chips, these are known to hit 300Mhz pretty easy. You could also go for sticks with some micron chips, but you have to search (on this forum) what chips clock best as i don't know that for sure ;)