• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

Direct X 12 Sli/Crossfire VRAM

It *can*. It's up to the devs, they have lower level access and can control the GPUs better -- if they so choose. I dare say it'll stay mirrored for the most part.
 
dx11 must use alternate frame rendering (AFR) which means one card does even frames and the other odd. This means both cards need to hold the full scene in VRAM.

dx12 allows for split frame rendering (SFR) which means each card renders half of each frame and they are presented as one. In this case the information required in VRAM is different so there is no need to mirror it and you have effectively twice the VRAM.

It depends whether devs implement SFR or stick with the lacklustre AFR.
 
Howling said:
It *can*. It's up to the devs, they have lower level access and can control the GPUs better -- if they so choose. I dare say it'll stay mirrored for the most part.
Click to expand...

I've been searching the web for nearly an hour for this answer. The big thing is AMD can co-exist with NVIDIA which doesn't interest me. But if I upgrade my 970GTX to a Sli config(which is doubtful if it was as bad as when I Sli'ed 2x 660gtx, a year or so ago), I will have the magical 4GB I should have had when I bought the card, and not the 3.5gb!
 
DavieJG said:
dx11 must use alternate frame rendering (AFR) which means one card does even frames and the other odd. This means both cards need to hold the full scene in VRAM.

dx12 allows for split frame rendering (SFR) which means each card renders half of each frame and they are presented as one. In this case the information required in VRAM is different so there is no need to mirror it and you have effectively twice the VRAM.

It depends whether devs implement SFR or stick with the lacklustre AFR.
Click to expand...

Amazing news. Thanks. So would you think a 2 x 970 GTX Sli config would be a decent config for 30+ FPS 4K gaming? Reliably...
 
fantasticCG said:
Yes that's correct
Click to expand...

hmmm well that actually confirms that.

Yep, we have to wait and see if developers are savvy enough to develop future games that combine memory of 2 graphics cards in 1 system.

Last time I had 2 x 660 GTXs and it just didn't work properly, especially Crisis 3 if I remember correctly, frame skips etc. That's the only reason that's holding me back on going Sli again, rather than one card that rules them all! But for 4K it seems Sli or Crossfire(which I'm seriously considering, as it works great for another guy on here in a 4K system).

Plus AMD cards come with a ton of memory.
 
in my experience now I have a g sync monitor the Sli together with that is an excellent combination and I've experienced no issues.

Crisis 3 is a very demanding title though Sli experiences vary from person to person, I was never happy with it until 6 months ago

Also because g sync works so well at like 30-45 fps (someone correct me if I'm wrong)
One big card like you said to rule them all! A TX or Ti it's so smooth I've tested games like GTA V and watcher 3 with 1 and 2 cards there's not a great deal of difference in looks just more frames
 
fantasticCG said:
in my experience now I have a g sync monitor the Sli together with that is an excellent combination and I've experienced no issues.

Crisis 3 is a very demanding title though Sli experiences vary from person to person, I was never happy with it until 6 months ago

Also because g sync works so well at like 30-45 fps (someone correct me if I'm wrong)
One big card like you said to rule them all! A TX or Ti it's so smooth I've tested games like GTA V and watcher 3 with 1 and 2 cards there's not a great deal of difference in looks just more frames
Click to expand...

Funny you mention G-Sync, I'm on the verge of getting one of those monitors and an additional 970GTX with 3D Glasses! And will hope that future developers combine memory of 2 cards, and that you'll be able to remove the Sli connector and Windows 10 will still use both GPUs(and the onboard Intel GPU)!

Some guy recommended G-Sync to me before I upgraded, hmmm well least I can get one of those monitors 27" for £375, they were £500.

Cheap upgrade and less of a headache for 4K, people are talking about 4 x Titan cards now, it's making my head spin.

G-Sync is 144hz mate, which is amazing.
 
Kaapstad said:
That is only for crazy people who want to use max settings on everything.
Click to expand...

Well I'm on the G-Sync wagon at the moment as it offers the 144hz and 3D option... but 4K is the future I'm just puzzled with the varied specs people are saying. I don't want to buy another 970gtx then find out it isn't good enough.

35fps 4k in lets say GTA V, on high settings, could 2 x 970gtx's pull that off?
 
davewhite04 said:
Well I'm on the G-Sync wagon at the moment as it offers the 144hz and 3D option... but 4K is the future I'm just puzzled with the varied specs people are saying. I don't want to buy another 970gtx then find out it isn't good enough.

35fps 4k in lets say GTA V, on high settings, could 2 x 970gtx's pull that off?
Click to expand...

I'm pretty sure it couldn't actually, I'd think medium at best...
 
davewhite04 said:
I'm pretty sure it couldn't actually, I'd think medium at best...
Click to expand...

This is only a benchmark (Heaven 4) but it does show GPU grunt pretty good.

2160p


1 GPU

  1. Score 725, GPU TitanX @1494/2002, CPU 5960X @4.5, Kaapstad Link
  2. Score 710, GPU 980 Ti @1560/2000, CPU 3450 @3.5, Rowlii Link
  3. Score 471, GPU 780 @1263/1852, CPU 4770k @4.5, whyscotty Link

2 GPU

  1. Score 1321, GPU TitanX @1455/1900, CPU 4790k @4.8, TTomax Link
  2. Score 1319, GPU TitanX @1380/2002, CPU 4930k @4.7, Kaapstad Link
  3. Score 1118, GPU TitanX @1216/1752, CPU 5960X @4.6, Cosimo Link
  4. Score 936, GPU nvTitan @993/1751, CPU 3930k @4.625, Gregster Link
  5. Score 700, GPU 970 @1478/2030, CPU 5930k @3.8, Clov!s Link

http://forums.overclockers.co.uk/showpost.php?p=28330040&postcount=4119

The important bit is a single 980 Ti or TitanX is out scoring a pair of GTX 970s @2160p.

What the bench does not show is the bigger cards also come with a lot more VRAM.

If you stick with 970s you are going to be a long way behind the bigger cards with both GPU grunt and VRAM.
 
As Kaap said, it's the VRAM that's making the difference. The 970s are okay in SLI at resolutions where VRAM is not an issue (1080p, 1440p), but when you are talking about 4k, the 6gb vs 3.5gb really does shine.

Just for reference, I was getting 45-55 FPS on GTA:V at mostly very high-ultra settings with 2x MSAA on a single 980Ti, at 4k.
 
Kaapstad said:
Stats.
Click to expand...
I'm seeing a single 970 scoring 700? Is that correct? Or is that the score for a 970 Sli?

Is it worth selling the 970gtx, which I'd get £200 after fees I guess, and get one Titan? Would one Titan be just as good as 2 x 980 ti? Sorry I'm just confused with the stats.

I could do one Titan, if so is it worth paying extra for the Titan Z? Is the sensible option 2 x 980 ti? would mean a PSU upgrade, which in the grand scheme of things is coppers... but I do want 2 years 4k if I do the upgrade.

That image give me a technical hard on.
 
Joe! said:
As Kaap said, it's the VRAM that's making the difference. The 970s are okay in SLI at resolutions where VRAM is not an issue (1080p, 1440p), but when you are talking about 4k, the 6gb vs 3.5gb really does shine.

Just for reference, I was getting 45-55 FPS on GTA:V at mostly very high-ultra settings with 2x MSAA on a single 980Ti, at 4k.
Click to expand...

Overclocked in anyway? I don't overclock which is ironic considering I have been using overclockers for hardware for over 10 years.
 
You must log in or register to reply here.
Back
Top Bottom