PC6400 (800mhz) no use in Santa Rosa

This is in ref. to this thread: http://forum.notebookreview.com/showthread.php?t=134549

First we found that 800mhz ram will run at 667mhz in Santa Rosa laptops. Intel said so on their homepage and it turned out to be no mistake. Then people where hopefull for a slight improvement when using 800mhz downclocked to 667mhz because of the improved timing.

Now CPUz shows 5-5-5-15 timing for 800mhz ram downclocked to 667mhz. This is the same as PC5300 ram.

So there is no benefit from 800mhz at all? Laptops with desktop chipsets like the Asus C90 might make use of it but Santa Rosa laptops.

 

You may have to go into bios and set a divider for the ram.

in a desktop you controll all these things, in a notebook I dont know if your bios will give you the option.

right now for instance in my desktop I have a 250mhz fsb so my ram runs at 500mhz because I have no ram divider in place.

when I run my cpu at 3ghz tho my ram runs at ddr600 wich is too high so I put a divider on it to make it run lower.

There is a divider in place on your setup because your fsb is 200mhz so if there was no divider it would be running 400mhz DDR speed.

So you need a diffrent divider.

 

It runs at 800mhz in my laptop. But then again I'm using the intel 965 chipset w/1066fsb not santa rosa.

 

@ Wu Jen: Can you check what timing the ram has when running at the true 800mhz? should be 5-5-5-18 I think

@ Vicious: I dont think notebooks have options like that in the bios. Maybe the notebooks with desktop cpus do but not the normal Santa Rosa laptops.