Difference about VSync Double Buffered and Triple Buffered

Solution
You should try GOOGLE things first, it is much faster. http://www.anandtech.com/show/2794/2

Vsync is short for Video Synchronization, that is to say to make the video card OUTPUT match the monitor DISPLAY (note in video there is a difference between the OUTPUT a device creates video signal for and the actual DISPLAY of video content). So if your video card is pumping out 100FPS, but your display is a 60Hz signal, Vsync will prevent the output signal from flooding the display with too much information (visual bleeding) and instead throttle the OUTPUT to match the DISPLAY.

Buffering is always taking data and holding onto it 'to the side' to access when a device is 'ready' for it. In this case (as noted in the link's visual example and...
You should try GOOGLE things first, it is much faster. http://www.anandtech.com/show/2794/2

Vsync is short for Video Synchronization, that is to say to make the video card OUTPUT match the monitor DISPLAY (note in video there is a difference between the OUTPUT a device creates video signal for and the actual DISPLAY of video content). So if your video card is pumping out 100FPS, but your display is a 60Hz signal, Vsync will prevent the output signal from flooding the display with too much information (visual bleeding) and instead throttle the OUTPUT to match the DISPLAY.

Buffering is always taking data and holding onto it 'to the side' to access when a device is 'ready' for it. In this case (as noted in the link's visual example and I said above there is two parts OUTPUT and DISPLAY) having both OUTPUT (writing) and DISPLAY (reading) of the same data causes problems (think of a writer of a book writing the book pages AS your trying to read it, if they write too fast you miss out, if you read too fast they can't give you enough information).

Double and Triple buffering are just the amount of buffers to help (2 or 3) these situations.
 
Solution
I was playing L4D2 with Double Buff on and drops drasticaly to 40 FPS or 30 sometimes for 3 secs, with triple buff on that doesn't happen. It's anything related to my hardware or it's normal?

Specs:

CPU - I5 4430S 2.7Ghz
RAM - 10GB
GPU - R9 280
PSU - XFX 750w
 
I would question how you have 10GB, that isn't a norm. Normally it be derivatives of 4; 4GB, 8Gb, 12Gb, 16, etc. Make sure you have PAIRs of RAM btw, if you don't have matching pairs that can cause cycling on the RAM as it unloads and loads the next batch of Data, which is why we do it in PAIRs of RAM sticks.

Otherwise sounds typical, as your playing online, anything can happen to cause more demand, but if the triple buff is helping more (that doesn't happen) then you need to stick to triple buffering as the Card is outputting more data then you screen can handle it would indicate (note what I said above).
 
I have read the whole post and Tom didn't answer your question and just have explain some random stuff, because here we talk about video game not some sort of weird thing on a random web site find on google. SSOO in that case I will continue to search for the answer ...
 


1) Don't post to a NecroPost (notice this was a posting over a year ago).
2) The op was confusing SEPERATE terms (VSync with buffering) so obviously did not (as you don't seem to) understand the 'BASICS' so not to ask the WRONG question
3) Get your eyes checked "Double and Triple buffering are just the amount of buffers to help (2 or 3) these situations"