PC-6400 vs. PC2-6400

Okay, so I'm upgrading the RAM on my PC and I found that the RAM I currently have is no longer available. No worries. But then, the PC6400C4 stuff isn't available at all anymore where I buy my parts from, so I'm wondering what to go for.

I know that different RAM will work with different boards, etc. So, can you help me know what I should be checking out? Do I basically just look for anything with "6400" in it?

For reference, my current spec...
Memory: GeIL 2GB (2x1GB) PC6400C4 800MHz Ultra Low Latency DDR2 Dual Channel Kit (GX22GB6400UDC)
System board: Gigabyte GA_965P_DS3P (Socket 775) PCI-Express DDR2 Motherboard

Feel free to just give me the specs, although worth keeping in mind I'll probably be buying from Overclockers UK so if you can link me to suggestions, all the better! :D

You should just be able to buy DDR2 ram.

Quote:

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- 240pin, Non-ECC, Un-buffered DDR2 SDRAM DIMM

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so 240 pin DDR2 SDRAM!

So this is good to go, yeah?

OCZ Gold Edition 4GB (2x2GB) PC2-6400C5 Dual Channel Series (OCZ2G8004GK) [OCZ2G8004GK] Memory DDR2 - PC2-6400

According to the product specification here, the motherboard supports DDR2 800 MHz memory, which is what you've linked to, so you should be okay.

One of them not having "PC2" is most likely a typo or lazy product naming, and going by your computer's CPU socket, it is impossible that you use anything than DDR2 RAM. Most manufacturers and stores use "PC2" for DDR2, "PC3" for DDR3 RAM, or just "PC" for DDR1.

While it would probably be possible to make DDR1 or DDR3 RAM that has 6400 MB/s bandwidth (800 MHz), it is never going to be something you'll find in stores these days.