The above answer is wrong. In the good old DDR2 days, there was ram that was AMD only. And nothing can make that work with an Intel motherboard. Intel DDR2 ram will work with both Intel and AMD systems.
I saw your comment and decided to do a bit more research. I didn't search exhaustively, but I was unable to find any cases of DDR2 ram specifically incompatible with intel. There were, of course, plenty of issues with DDR2 compatibility-timings, voltage, density, non standard specs, etc. In old Tom's forum posts on the issue, what seemed to be the consensus was that RAM that matched what the motherboard specified worked (with the exception of some touchy motherboards) regardless of AMD/intel. Intel incompatibility is red herring that distracts from the real issue of widespread DDR2 incompatibility.
Some RAM was marketed as AMD only because of extended memory profiles that intel did not support. While an intel board would not support these "overclocked" profiles, it would still work with the slower jedec timings. Judging by the speed listed, I doubt that the modules purchased require such a non-standard profile to reach their rated speed and timings.
I still think the main issue here is that the OP purchased DDR2. If the system really needs DDR2, then it is too old to be worth upgrading.
If you do know of a specific kit that has been confirmed to be intel incompatible, let me know. I would like to look into the issue more.