Question 1

i have a HP7900 mini tower which has pc2 6400 ram in it.  Can i replace it with the KTH-XW4400c6?

Accepted Answer

I don't remember for which HP computer I bought this memory.  I do remember that I did put it in one of my older HP computers and it worked fine.  Looking at the specs for your computer, it appears to have 4 memory slots - depending on how much memory you are planning on purchasing, you might be able to keep the existing memory (or some of it) installed.  For example, if you currently have 1 or 2 memory slots filled with 256MB or 512MB each, and you buy 2 of the 1G memory boards, you could add the new memory to the existing and have 2.5GB or 3.0GB total. If you are using a 32-bit operating system, you should keep the total memory to 3.0GB or less.

Question 2

will this work as a additional ram card for a compaq dc7800?

Accepted Answer

Mine was dc7700. Per Kingston, it should work on dc7800.

Brand	Kingston
Model	KTH-XW4400C6/1G

Capacity	1GB
Type	240-Pin DDR2 SDRAM
Type	240-Pin DDR2 SDRAM
Speed	DDR2 800 (PC2 6400)
ECC	No
Compatible System	HP/Compaq

Kingston 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) System Specific Memory For HP/Compaq Model KTH-XW4400C6/1G

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Item#: N82E16820134836