ddr2 800 showing up as 400mhz

codex · 4 Sep 2007 at 16:09

Does anyone know why my geil ultra 2gb ddr2 pc6400 is showing up in cpu z as running at 400mhz.

is my ram knackered or is it my motherboard an asus p5k?

duvet77 · 4 Sep 2007 at 16:13

thats right... it's 2 x 400mhz because its double date rate, so that's 800mhz.

Yesam · 4 Sep 2007 at 16:14

RAM's fine, its DDR2 so you have to double the rate.

Think of it as a motorway with two lanes, you have 400mhz going in one way, 400mhz the other therefore 800mhz total.

Also, remember that FSB speeds need to be divided by 4 to get the actual front side bus speed.

[EDIT]Duvet77 beat me to it![/EDIT]

titaniumx3 · 4 Sep 2007 at 16:17

That is normal. Remember, DDR (double data rate) memory can carry double the amount of memory for every Hz, hence 800mhz memory is actually running at 400mhz.

codex · 5 Sep 2007 at 17:10

phew!

That's relief, but another problem I'm having is the timings don't run at 4 4 4 12 specified for the ram, instead they're running at 5 5 5 18, the PC crashes when I try to set this manually in bios.

Any help guys?

Dingleberry88 · 5 Sep 2007 at 17:19

Set the correct voltage?

helmutcheese · 5 Sep 2007 at 17:22

At a guess, ram will need 2.1v (Jedec Spec), then set timings manually as Mobo aint reading SPD in Modules.