G.Skill 2GBHZ advertised at DDR500 CAS 3-4-4-8 but mine is 3-5-5-10 by SPD?!

[Krohling]

I have a little problem here...

I have noticed my 2GBHZ kit should be 3-4-4-8 but it is detected as 3-5-5-10
So CPU-Z and Everest confirm that, by reading the SPD info:

Any word on that?