GPU concepts Explained!


In yesterday's post, I talked about the things that you need to consider while buying a GPU. If you haven't checked it already, here's a link.

3 Things to consider while buying a GPU


Today I will be talking about some common terms that you might come across when dealing with graphic settings of your GPU.


VSYNC 


Image Tearing effect due to V-Sync turned off.

Source

If you are a gamer then you might have come across this term.

What does V-sync really mean?

V sync stands for Vertical Synchronization. To understand the concept of V-Sync we need to understand what is "Refresh Rate". Refresh rate is the rate at which an image is redrawn on the display device.

So what does a refresh rate of  60 Hz actually imply?

It means that the image is redrawn by the display device 60 times a second.
Yep, you guessed that right, that's the max fps, which you can get out of the system.

Returning back to the main question, V sync basically synchronizes the fps that your graphic card delivers and the fps delivered by the display device.

If you have a really powerful graphic card that outputs around 100-200 frames per second and you have a monitor with max fps of only 60 then you should turn your V-Sync ON.What it does is, it lowers the graphic card output fps.This simple tweak makes the gaming experience a whole lot better.If you turn V-Sync OFF then your monitor won't be able to keep up with your GPU's fps and you would observe a screen tearing effect.

But if you have a weak graphic card (like my graphic card) it's recommended that you turn V-Sync OFF.This may run the game at a decent frame rate.


ANTI ALIASING



Source

Have you ever wondered, why don't straight diagonal lines appear smooth?You see a stepped line rather than a smooth one.This is called aliasing.

How can I get rid of it?

So there are various technologies used to get rid of it. MSAA or FXAA (a much faster version) are used to get rid of the staircase effect.All of them work on the same principle.They just take samples of the points near the stepped line and try to fill it so that it looks like a smooth line.


BUFFERING





You might have seen a triple buffering option in your GPU settings.

So what exactly is it?

Generally a GPU has 2 buffers a primary buffer and a secondary buffer.So when a GPU starts working it renders a frame and stores it in the primary buffer, then this frame is taken and displayed on the monitor.While the frame is being displayed the GPU works on the next frame and then stores it in the secondary buffer.Then the frame in the secondary buffer is displayed.

This is called double buffering.When the same concept is applied to 3 buffers its called triple buffering.

So if I turn it ON the fps increases (V-Sync should be turned on) and we get smoother animations.
But turning it ON will also increase the VRAM usage.

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