Samsung 1Gb 667 Mhz DDR2 with iMac

I've recently upgraded my new iMac's (iSight) RAM with 1Gb. I bought
the module at an apple store (i don't know if it was
official) and they suggested me choosing
the 667Mhz DDR2 module instead of the 533Mhz one (it may freeze
the computer they said). So i bought it.
The computer got faster and it works all right but as i opened
the system profiler as noticed the following:
Size: 1 GB
Type: DDR2 SDRAM
Speed: PC2-3200U-288
Status: OK
Shouldn't it be '4200U-533'? What does it mean? Would it be faster
with a 533Mhz module?
Thx for your help in advance!

Since no one else came forward...
I do not have a new iSight model. Does it come with an Apple Hardware Test, and if so, have you run it to see how it designates the RAM? I have no explanation why System Profiler shows what it does, but am curious if Apple Hardware Test shows the same designation for your RAM as does System Profiler.
I suspect that System Profiler is simply making an inaccurate report, that the RAM you bought is backwards compatible, and as usual, is running at the same slower speed as if it were the specified RAM.
Perhaps your retailer suspected that the RAM he would be selling you might be going to underperform its specification and risk not meeting the minimum requirements to work in your system. By moving you up to a faster speed, he assured that it would work.

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