DDR2 - Basic question regarding speed rating

[Sasqui]

I'm running a system with DDR and quite understand that DDR-500 means that the actual rated bus speed of the memory is 250Mhz (1/2 of 500).

Here's a simple/silly/naive question regarding DDR2:

Assuming FSB:MEM ratio of 1:1, and I have DDR2-800. What's the max FSB I can go before I reach the DDR2-800 mark?

 

[Deleted member 3]

400. Just like DDR400 (PC3200)goes up to 200.
DDR2-800 is PC6400, gives you 6,4GB/s per channel. The numbers are quite logical

DDR2 won't work in DDR systems though.

 

[Sasqui]

400. PC6400, gives you 6,4GB/s per channel.

That what I thought - I didn't know that the "PC" numbers referred to bandwidth (theoretical of course)... I just learned something.

DDR2 won't work in DDR systems though.

Yea, not that naive I chose my current motherboard as the 915 chipset is the only to naitvely support PCIe AND DDR/DDR2 (mine only has DDR support, allowing my to use my Geil DDR500 memory and upgrade graphics.)