DOOM: OpenGL or Vulkan?

[RRGT19]

Hi,

I don't understand what are the differences here.

Can someone explain me please?.

Which is the best option?.

 

Also, should I use framerate limit or not (adaptive mode).

[Skiiwee29]

Vulkan is the new API written to eventually replace open GL. If you're running an AMD card, run in Vulkan as you will see the greatest boost in performance. On nvidia currently, they both perform about the same due to Async compute handled in the driver level instead of the hardware level like AMD cards. 

[Ryoku]

If you have a gpu that support vulkan you'll get better frame rates with it, if you have an older card that doesn't then you don't need to worry about it.

[MaxBunny]

4 minutes ago, RGT said:

Can someone explain me please?.

Which is the best option?.

If you have an AMD card from 7000, 200 series or higher then use Vulkan for a performance boost.

[typographie]

15 hours ago, legacy99 said:

On nvidia currently, they both perform about the same due to Async compute handled in the driver level instead of the hardware level like AMD cards. 

From what I understand at this point, what we call "asynchronous compute" is the use of multiple hardware queues in the chip simultaneously, so I don't think there's such thing as "driver-based asynchronous compute." It's defined by how it's using the hardware.

 

Both Maxwell and Pascal have multiple queues, therefore they both have the necessary hardware present. For Maxwell cards, that functionality is prevented by the driver. All instructions are forced through a single queue. Pascal cards do scale with asynchronous compute. AMD's implementation in GCN just seems to do it better.

[GamerDude]

On 9/2/2016 at 5:18 AM, legacy99 said:

On nvidia currently, they both perform about the same due to Async compute handled in the driver level instead of the hardware level like AMD cards. 

Not exactly correct, or at least, based on my experience. I compared my 2nd and 3rd rigs for example:

2nd Rig - Intel i7 4770K/16GB RAM/2x GTX Titan 6GB/64bit Win10 Pro

3rd Rig - AMD FX8350/16GB RAM/2x HD7950 3GB/64bit Win10 HP

 

I tried both OGL and Vulkan on my Titans, I get about 60-90fps with Vulkan, but with OGL, I get 70+ - >100fps. Yes, I know Kepler doesn't have async compute capability so its performance suffers a little going from OGL to Vulkan. On the other hand, I've only tried Vulkan on my 2x HD7950, I was quite surprised that framerate was actually higher than my Titans' with Vulkan. It was more like Titans' OGL framerate 70+ to >100fps) with Vulkan API, I'm pretty sure this performance would tank big time should I switch to OGL for the HD7950s'.