HTPC slow as dirt after RAM upgrade

Perc

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I have a slightly old HTPC which I built in 2008. It has the following specs:

- Core 2 Duo <2GHz (can't remember)
- 2x1GB DDR2 667
- Intel DG33TL motherboard with built-in graphics
- Some sata drives

It has worked flawlessly since 2008, until I put another 2GB in it. The thing is, I didn't remember the original RAM was 2x1GB so I bought a single 2GB module leaving me with 2x1GB and 1x2GB. With the new stick installed, it's significantly slower than before, to the point of the mouse pointer going choppy when it has to do something insanely demanding like draw the icons and buttons in a newly opened folder window. :p HDD I/O seems unaffected though, judging by how long it took to unrar a couple of ~1GB archives.

I just removed the 2GB module, and it runs fine again, just like I always has.

What gives? Faulty RAM? Dual channel issues?

edit: the memory modules I've got are these:

Old kit: Kingston 2048MB 667MHz DDR2 NON-ECC CL5 DIMM (2x1024MB KIT)
New module: Kingston Valueram 2 GB 2048 MB 667 MHz DDR2 NON-ECC CL5
 
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Dual channel shouldn't make it THAT slow, either faulty RAM or incompatible timings would be my guess. Have you tried swapping the sticks places? Perhaps a bad slot?
 
They're both CL5 and the same frequency so my guess is also faulty ram.
 
Definitely faulty ram.
 
A little late to the party, but still to add - faulty ram.

I've had several bad sticks of Kingston's Valueram, but it has always been issues of compatibility. They worked fine on other machines.
 
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