I don't what settings they had, one of the laptops was almost identical to mine but had the issue, but I know that the Minecraft settings were basically the same as mine.
I did have multi-core chunk loading and Max FPS on, it's a weird thing though. I could have more stuff turned on like further render distance and a high resolution texture-pack with little to no change in FPS. The problem was that the FPS it stayed at wasn't completely smooth, it was a slightly skippy kind of framerate.
On another note, one of the laptops that gets the flickering issue also gets 300-400 FPS on vanilla Minecraft. It has vista as well it really bugs me.
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