Compaq Presario SR1522X Dual Channel RAM question

[real world]

Hi guys, first off, thanks in advance for any advice, and comments. My mom has a Compaq Presario SR1522X, with 512 MB of PC2-3200 RAM. I want to bump up the RAM on her system, and I was wondering if a GB of Dual Channel PC-3200 RAM I have from my old Alienware would work in her system. If so, could I/should I, add the 1GB of dual channel RAM to the current 512 of single channel she currently has. IIRC, this is possible, although it would limit the performance of the dual channel sticks. Is that right, or am I on drugs?

Again, thanks in advance.




Compaq Presario SR1522X Desktop PC

Hardware
Base processor
Pentium4 516 (P) 2.93 GHz:
533 MHz front side bus
Socket 775
Chipset
Intel 915GV
Motherboard
Manufacturer: Asus
Motherboard Name: PTGD-LA
HP/Compaq motherboard name: Goldfish3-GL8E
Memory
Component Attributes
Memory Installed 512 MB (2 x 256)
Maximum allowed 4 GB* (4 x 1GB) requires the replacement of the installed 256 MB DIMMs

*Actual available memory may be less
Speed supported PC2 3200 MB/sec
Type 240 pin, DDR2 SDRAM
DIMM slots Four
Open DIMM slots Two

Specs:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00411254&lc=en&dlc=es&cc=pr&product=501581&lang=es

 

[Kandybar_86]

I think using different kinds of RAM chips (in your case different capacities) will affect performance somewhat, as the 1GB will have to work slower to let the 512MB catch up. Though I may also be on drugs

 

[evongugg]

DDR1-400 will not work on a DDR2-400 socket.
The speed is the same, but the notches are different.