Perhaps your BIOS set them to "safe timings", i.e. the slowest it can think off. The memory should have a chip onboard that tells the BIOS how fast it can run, but it seems this isn't read properly, or isn't setup properly. Did you read the motherboard's manual?
The XMS modules are indeed rated for 2-3-3-6 speeds, and I doubt they're defective; I have rarely seen defective XMS modules (and I've sold lots of them in my shop). I'd look at the BIOS first, and if that doesn't solve it, they *might* be defective. Or you might need a BIOS update.
what brand and type of motherboard do you have?
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