Is measuring fps with dsr 1440p on 1080p reliable

P4-630 · Mar 24, 2017

As the title says.

I wanted to test how well GTA V fares @ 1440p on my 1080p monitor.
After testing it seems I have to lower the MSAA from x4 to x2 at this resolution to keep the 60fps.
I also tried in game half refresh rate but it wasn't smooth, then I tried using RTSS to lock the fps at 50 while using 4xMSAA but this wasn't smooth either.

So MSAAx2 was fine, would my results be the same once I have a real 1440p monitor or will it work even better then?

jboydgolfer · Mar 24, 2017

I would guess that it's not quite the same as an actual 2K monitor, but I could be wrong. I guess regardless of what video output is being displayed as far as the GPU is concerned technically it is rendering the 2K resolution I just don't know if the lack of an actual 2K monitor affects the GPUs workload

Vya Domus · Mar 24, 2017

The cost of MSAA rises with resolution greatly. So at 1440p with 4x MSAA it will probably result in a significant drop in performance. I have run a couple of games (including GTA 5) at 4K on a TV vs 4K DSR and I did not notice any difference in terms of performance.

Shihab · Mar 24, 2017

I'm guessing 1440p DSR should be heavier than actual 1440p output, with the former involving additional processing stage (whatever downsampling algorithm they use) = more latency. Then again, image scaling would take a modern gpu like, what, 1ms?

Yes, the results should be comparable.

Also, I don't really see a benefit for having two supersampling methods working at the same time (well, if we could call MSAA "super sampling") that doesn't cross the point of diminishing returns.

P4-630 · Mar 25, 2017

Vya Domus said:
So at 1440p with 4x MSAA it will probably result in a significant drop in performance.

Well with 4xMSAA it runs almost at a steady 60, just drops in the 50s with lots of things (explosions) going around or sometimes in the mountains in the game.

P4-630 · Mar 25, 2017

I'm currently looking at this 27" Acer 1440p IPS 60Hz monitor, it's on sale for 349 Euros:
https://www.kieskeurig.nl/monitor/product/3379091-acer-h7-h277hukmipuz/specificaties

Or should I go for this small Dell 23.8" S2417dg TN 165Hz G-Sync , which costs considerably more at 525 Euros...

https://tweakers.net/pricewatch/581879/dell-s2417dg-zwart/specificaties/

I'd love to get a 27" G-Sync monitor but I just can't afford that so thats not an option.

Can I use RTSS to lock my fps at let's say 40 or 50fps to play my games at ultra , with this Dell G-sync?
If so, would it still be smooth at a locked 40, 50fps?

Tallencor · Mar 25, 2017

P4-630 said:
Can I use RTSS to lock my fps at let's say 40 or 50fps to play my games at ultra , with this Dell G-sync?
If so, would it still be smooth at a locked 40, 50fps?

That's exactly what I do. I don't play 2 many demanding games but I use freesync with no v sync and using rtss cap @ 142 Hz. Smooth as melted butter. The thing I noticed with Freesync was the lower end. The 24" model of my monitor lost Freesync below 40 frames while the 27" was 35 so I bought that one. Not sure if Gsync behaves as such but its worth looking into when your looking @ the frame count that you are. If it does dip below or go over the 144 Hz then it chops up pretty bad.

P4-630 · Mar 25, 2017

Ok just found another option, 27" Acer Predator 1080p 144Hz G-Sync with VA panel 4ms..... 500 Euros :ohwell:

https://tweakers.net/pricewatch/560179/acer-predator-z271bmiphz-rood-zwart/specificaties/

With this I still get a larger screen (27") which I actually wanted, yet it's 1080p but with this I'm still able to play my games at ultra with eye-candy MSAA and stuff..

Just 82dpi though... Maybe the games don't look as good on this one afterall..?..

What do you guys think?
Or a monitor from my previous post?

Tallencor · Mar 25, 2017

How are your eyes. Me: 27" 144Hz 1080p freesync. My eyes are not what they were, I lean into the monitor sometimes and as such notice the extra real estate. But I fix it with whatever level of AA that keeps me above 60 fps with no dips. This helps clean the image as well.

P4-630 · Mar 25, 2017

Tallencor said:
How are your eyes. Me: 27" 144Hz 1080p freesync. My eyes are not what they were, I lean into the monitor sometimes and as such notice the extra real estate. But I fix it with whatever level of AA that keeps me above 60 fps with no dips. This helps clean the image as well.

Well I'm currently using a 21.5" 1080p IPS as main monitor when I play GTA V I just noticed with MSAAx4 at 1080p doesn't look as good as 1440p DSR @ 1080p with 2xMSAA.... :ohwell:

I'm sitting about 50~60cm from my monitor.

I may go for the 23.8" 1440p Dell G-Sync afterall for better image quality then... 525 Euros though..

Tallencor · Mar 25, 2017

On 27" 1080 downsample to 2560 I find the UI to be to small.

Shihab · Mar 25, 2017

Question: Why do you want to lock your framerate bellow monitor's refresh rate?

P4-630 · Mar 25, 2017

Tallencor said:
On 27" 1080 downsample to 2560 I find the UI to be to small.

Yeah I was just thinking if I would buy that Acer 27" 1080p G-Sync and just use 1440p DSR for GTA V with MSAAx4 it should just look as good as it does now with my 21.5" 1080p monitor,
the image is just larger. I can use MSAAx4 then even it the fps drop in the 50s, with G-Sync it should still be smooth right? And I could still enjoy a larger 27" monitor.

(with the same desktop real estate though.. :ohwell:

)

Shihabyooo said:
Question: Why do you want to lock your framerate bellow monitor's refresh rate?

Well I don't need to run my GPU at 100% all the time, if I can get smooth gameplay with less fps I'm happy with that and it keeps my GPU run cooler!

P4-630 · Mar 25, 2017

Almost 100% made up my mind, most probably go for the 27" Acer Predator 144Hz VA curved (lol! is that better?

) 1080p G-Sync panel.
I will just use 1440p DSR if I want better image quality in my games!

And I will still have a larger image in the end, which I wanted.

499 Euros..
https://tweakers.net/pricewatch/560179/acer-predator-z271bmiphz-rood-zwart/specificaties/

:peace:

RejZoR · Mar 25, 2017

Curved screens are not cool. Unless you like curved everything, including spreadsheets, desktop elements, every line you draw in MS Paint/Photoshop etc.

If you want ACER Predator, I'd take XB1 or XB2. Flat (non curved) screen, one is IPS, other is 240Hz monstrosity.

EarthDog · Mar 25, 2017

To answer the OP... No.

P4-630 · Mar 25, 2017

RejZoR said:
Curved screens are not cool. Unless you like curved everything, including spreadsheets, desktop elements, every line you draw in MS Paint/Photoshop etc.

If you want ACER Predator, I'd take XB1 or XB2. Flat (non curved) screen, one is IPS, other is 240Hz monstrosity.

The IPS are costly and are 1440p in my country.

My wallet just isn't much deeper than 500 Euros.

I rather would have a flat panel I think, but I have never seen this monitor before in my country until today, and it comes with a VA panel, I'll get used to that curved panel I guess... :ohwell:

EarthDog said:
To answer the OP... No.

So I would get better fps with an actual 1440p monitor vs DSR you are saying?

P4-630 · Mar 25, 2017

@RejZoR would you go with this one then?

€ 449,- 27" Acer predator 144Hz G-Sync 1ms TN.
https://www.4launch.nl/product/387861/

This one ok, it's curved but has a 144Hz VA panel. 499 Euros.
https://tweakers.net/pricewatch/560179/acer-predator-z271bmiphz-rood-zwart/specificaties/

RejZoR · Mar 25, 2017

I personally think G-Sync is a waste of money. Monitors are like 100 bucks more expensive from the get go because of it and if you ever switch to Radeon, you'll have no functionality for it.

FreeSync on the other hand, supported by AMD, but not by NVIDIA. But NVIDIA offers Fast V-Sync and Adaptive V-Sync. So, zero image tearing no matter what camp of graphic card you currently "belong to". Plus, FreeSync monitors aren't much more expensive anyway.

From my current experience, even TN 144Hz is superb. TN panels have come a long way since their inception in monitors. And like I said, personally, I'd stay away from curved monitors. They are fancy looking and all, but they aren't actually practical.

BiggieShady · Mar 25, 2017

DSR has a extra filtering pass (gaussian filter) that does not exist when using native resolution ... so the results you get are just a little worse
GTA V has also a built in frame scaling mode inside the engine (advanced graphics settings), but that doesn't render the UI in high res, only the game frame.

RejZoR · Mar 25, 2017

You can set filter to 0% processing in NV CP. It should be 1:1 performance then (within margin of error).

P4-630 · Mar 25, 2017

RejZoR said:
From my current experience, even TN 144Hz is superb. TN panels have come a long way since their inception in monitors. And like I said, personally, I'd stay away from curved monitors. They are fancy looking and all, but they aren't actually practical.

Yeah I have been reading about it a little more, big companies needed something new so they started making curved Tv's and now curved monitors.
For gaming it might be just fine but for desktop work, email, browsing maybe not so.

On the other hand a VA panel seems "better" then a TN.

I don't really need curved and now I'm thinking I might go for the flat 27" Acer predator 144Hz G-Sync TN 1ms...
It's also 50 Euros cheaper than the curved VA.

https://tweakers.net/pricewatch/495617/acer-predator-predator-xb271hbmiprz-rood-zwart/specificaties/

RejZoR · Mar 25, 2017

VA is somewhere between IPS and TN. Has better view angles and colors, but slightly more ghosting and higher pixel response time.

Kanan · Mar 26, 2017

It's not 1:1 the same as using a real 1440p resolution and monitor, because DSR eats some performance to do the downscaling, but it's a minor difference at best. I have great performance in Payday 2 for example, using 2x 1080p (which is higher than 1440p).

Frag_Maniac · Mar 30, 2017

This pretty much proves the results are so close they would be indistinguishable just playing without looking at FPS.

This is 4k DSR vs native 4k. The native 4k is 1 or 2 frames higher FPS due to no added calculations to scale to a lower res, but not enough to affect gameplay at all.

So basically, DSR (and VSR) are pretty good tools to determine whether your GPU is powerful enough to run a higher res display before you buy it.

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Is measuring fps with dsr 1440p on 1080p reliable

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