Hear 2 beeps when new Intel motherboard DG41TY boot up, is it normal?

I bought a new Intel motherboard DG41TY yesterday. I have installed everything, then when I boot up, here is what happen:

1. first I hear a beep

2. intel logo show

3. second beep

4. windows logo and start to load as normal, everything work fine

So there isn't any error message, just I have never used any computer that would give me 2 beeps. I know there is beep code that indicate any problem while boot up, but it doesn't look like any problem at all, no error message and everything run fine.

Is this just the new style of Intel motherboard? Or my motherboard has some serious problem so I should return to the shop?

Thanks a lot!

As said check the manual, but several years ago I built a pc for a friend, it was based on an ECS mobo and it did pretty similar thing, but the first beep would come just after the Power button was pressed but before there was a video signal to the monitor, and then another one as in normal POST procedure. It was weird but that pc worked OK for good few years.