RAM SPD Bandwidth Question

For my recent built, I used a pair of Corsair 2 x 2GB sticks (CMX4GX3M2A1600C9) and checked them using CPU-Z (and AMD OverDrive). My computer's running fine, I just don't know why my RAM shows in CPU-Z as having a 10.7GB/s bandwidth (PC10700 equivalent) when the memory is actually PC12800 (12.8GB/s)? It does show up running at the correct *dual* 800MHz frequency, just wondered about the bandwidth and why it's off. Thanks.

Here's my built:
Antec Six Hundred case
ASUS VH232H Full HD LCD monitor
AMD Phenom II X4 955 Black Edition (rev. C3)
Corsair XMS3 2x2GB 1600 DDR3 PC12800
HIS Radeon HD 4850 1GB DDR3 256-bit
Seagate Barracuda 7200.12 250GB
Corsair 650W PSU
Lite-ON iHAS424-98 DVDRW w/LightScribe
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  1. The memory actually is very good PC10700 overclocked to PC12800.
  2. ?Not sure what you meant?

    Nothing is overclocked. I set the timings manually in my BIOS to reflect the manufacturer ones 9-9-9-24. At auto, it was reading 11-11-11-X (don't remember the last one).

    I'm just curious as to why the bandwidth shows up as PC10700 instead of 12800 (i.e. 12.8GB/s). My motherboard fully supports all RAM clock speeds, all the way until 1800MHz (O.C.).
  3. I meant that the manufacturer used PC10700 chips, but sort of warranties that they'll run at PC12800. In other words, when running at 1600 MHz, the modules are overclocked.
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