What memory speed would an AMD X2 3800 socket AM2 use?

[AMCRambler]

Thinking about possibly building an HTPC/gaming rig. Up until now all the systems I've built are DDR1. What speed DDR2 does the x2 3800 use? Used to be able to tell just by the bus speed but now they all list the HT bus speed which doesn't match the memory speed.

 

[Frintin]

I think the AM2 socket allows for up to 1066 FSB memory, not totally sure if anything higher has been implemented. Depending on your choice of chipset really i guess.

 

[AMCRambler]

Originally posted by: Frintin
I think the AM2 socket allows for up to 1066 FSB memory, not totally sure if anything higher has been implemented. Depending on your choice of chipset really i guess.

For the stock speed of the 3800 though isn't it a predetermined value?

 

[lobbyone]

did you mean PC4200/5400/6400/8000?

 

[eplebnista]

http://forums.amd.com/index.php?showtopic=87112

 

[13Gigatons]

http://en.wikipedia.org/wiki/Athlon_64

As the memory controller is integrated onto the CPU die, there is no FSB for the system memory to base its speed upon.[52] Instead, system memory speed is obtained by using the following formula (using the ceiling function):[53]

\frac{\mathrm{CPU~speed}}{\left\lceil\frac{\mathrm{CPU~multiplier}}{\mathrm{DRAM~divider}}\right\rceil}=\mathrm{DRAM~speed}

In simpler terms, the memory is always running at a set fraction of the CPU speed, with the divisor being a whole number. An 'FSB' figure is still used to determine the CPU speed, but the RAM speed is no longer directly related to this 'FSB' figure (known otherwise as the LDT).

To summarize, the Athlon 64 architecture features two buses from the CPU. One is the HT bus to the northbridge connecting the CPU to the chipset and device attachment bus (PCIe, AGP, PCI) and the other is the memory bus which connects the on-board memory controller to the bank of either DDR or DDR2 DRAM.