Acer 5920G 800MHZ FSB/MEM how?

Ive upgraded my notebook: 2x2GB 800MHZ DDR2
But The system information only shows 667Mhz FSB and 667Mhz memory speed.

How can I set it to 800Mhz?

 

If you have an Intel processor, you will never get 800MHz RAM. Some AMD notebooks might run it at 800MHz.

 

At this point I dont think there is a way to make your mem run at ddr2 800. The PLL on the 5920 is so far unsupported.

 

Santa Rosa doesn't support 800MHz DDR2, you can put them but it will be working with 667MHz.

 

OK. My Notebook CPU is T7300 (2.0Ghz, 800Mhz FSB, 4MB L2 cache)
what does 800mhz fsb means than?

 

from what i've been reading as a result of your post i'm being led to believe that the FSB of the CPU and the memory run on independent clock speeds especially when the FSB of the CPU is above 667mhz.

someone please correct me if that is incorrect...

FSB is the front side bus of the CPU
for example my 1.73mhz CPU

has a 533 mhz FSB which is actually 4 pipelines at 133mhz each

so thats 133mhz
and a X13 multiplier

which totals the 1.73..

just my 2 cents, for what it's worth,
bigozone

 

My cpu's FSB is 800MHz!
I checked it with cpu-z, nvidia system monitor, clockgen. (200MHz)
So, it works on 800MHz, but how can i force my mem to work on 800mhz?
I can edit it with SPD tool. Anyone tried it?

 

Your cpu fsb must be 800Mhz, your memory cant run any higher than 667. With spdtool you can change your ram timings. For example i have changed 5-5-5-15 to 4-4-4-12

 

I have the same computer 5920G, with the default 2x1 gig ram that came with the notebook. I have downloaded the spdtool. How do I change the ram timings?

 

I bought 2 2gb 800mhz ddr2 sodimm.
why cant they run faster than 667?

 

Memory speed doesn’t depend from cpu. It is limited by chipset.

 

The chipset that is in your laptop cannot run memory at 800MHz. Only 667MHz and lower.

RAM and CPU speeds are not always identical.

 

1) Use Spdtool (to change cas 5 to cas 4)
----------------

Change this for every dimm:





after that, click 'fix chechsum' and save



2) Use Memset 3.5 beta to change the other timings

 

Thanks, the picture is not loading very well. I will try it but this looks quite dangerous, is it possible to easily revert it back if it make my system less stable or does it brick my laptop? Can you actually measure the speed gain after changing the timing? Right now the ram is the bottle neck in my computer with vista score 4.8. I hope I can increase the score.

 

For the begging do it for your (only) first dimm, check if everything works fine and then do it for the second dimm.

To measure the gaining speed, chech the latency with eg Everest Ultimate.

I have vista sp1, my memory score was 5.1
With timing changes my score is about 5.3

 

How to use Memset 3.5 beta to change the other timings?
Post yours timing pleace!

 

I can't change my cas, after changing values to 4 and fixing check sum I am trying to write new values first to module 0 and then I get an error as shown on capured screen. I tried to ignore it but then I get 2 another errors and messege about compliting process but nothing is changed. Could someone tell me what I do wrong??

 

A picture from when i was testing:
http://imageshack.gr/view.php?file=9t9j6a6l9mgu47winaub.jpg

 

I don't think there is any benefit in running at 800mhz the memory module because (I assume) the memory runs in dual-channel which means that the frequency is doubled when using two modules.
i.e.: 2*667 = 1334mhz
Your system won't bottle neck this way as the memory runs at greater than or equals to the CPU fsb.

 

I followed cxmgp's instruction and got the same error result as Shamtu. The memory spd didnt appeared to change. Anyone help out?