Upgrading Memory Modules on Toshiba p25-s526

I have a Toshiba P25-S526 laptop that is a Pentium 4 CPU 3.2 Ghz with a 800 FSB. It currently has a 512 MB DDR PC2700 333Mhz CL 2.5.

I want to upgrade the memory and am wondering if it can upgrade the
memory to a faster MHz one that is much closer to my FSB. Also, am I
restrained by the PC2700.


I see some memory modules at PC4300 533 MHz and some at 667MHz.


Can I upgrade my memory chip set to tak advantage of these faster
MHz. Why or why not.


Thanks,

 

Please try to not to double post.

JC

 

Cesar, the Intel 865PE chipset does supports up to DDR400 (200Mhz) (PC3200) (ddr 1 only), so in theory the P25 should switch to a 200mhz memory speed when DDR400 memory is installed, but no garuntees as Toshiba likes to do some screwy stuff.

On monday I will isntall some memory DDR400 memory in a p25 and let you know what happens.


Right now you are probably confused by the maximum supported memory speed being 200Mhz. Here is why. Intel's 800Mhz bus, isnt really 800Mhz. It uses a dual channel 200Mhz bus that sends data on the upswing and downswing of each clock. So you essentially take the 200Mhz and multiply it by four. this works great as it is able to send alot of data over the bus, but the latency isnt that great because the bus is still at 200Mhz (for a cpu runing at 3.2Ghz it has to wait 16 clock cycles before it can request new data from the memory, although it recieves data every 8 cycles)

My last comment is that you should use two 512mb DDR400 SO-DIMMS. Since the memory controller is dual channel (and the sockets are setup for it), having both memory sockets filled over having just one will DOUBLE your theoretical memory bandwidth. Toshiba will usually only put one DIMM in, for I dont know what reason, but to get the most out of the P25, using both memory sockets is a MUST.

 

Can you explain the below quote to me in more detail so the next time I purchase a PC I can better match the CPU with the latency.

"So you essentially take the 200Mhz and multiply it by four. this works great as it is able to send alot of data over the bus, but the latency isnt that great because the bus is still at 200Mhz (for a cpu runing at 3.2Ghz it has to wait 16 clock cycles before it can request new data from the memory, although it recieves data every 8 cycles)"

Also, I went to the following site

http://www.crucial.com/store/listparts.aspx?model=Satellite+P25+Series

and it indicated that only the PC2700 DDR 333 Mhz was a compatible upgrade.
It also indicated that the computer does not support dual-channel memory nor does it support ECC memory.

Wondering if the memory controller is dual channel, like indicated in the previous message and if the memory modules are ECC or non-ECC.

Thanks,

 

Hey MaxxRacer,

Any success in installing the DDR400 memory in a p25.

Thanks,