During this twelvemonth'due south GDC, Nvidia appear that GTX graphics cards would be getting basic ray tracing support with a driver update. A few weeks later, that's come to happen with cards ranging from the GTX 1060 6GB, the recently launched GTX 1660 GPUs, as well equally the Titan X, XP, and V.

Prior to this you needed an Nvidia Turing RTX graphics card to get the visual benefits of ray tracing, simply for a variety of reasons we'll become to later, you can at present access the feature with many other GPUs. For putting together this exam we took the nigh powerful Pascal GPU we had on hand – the Nvidia Titan X – and pitted information technology confronting Nvidia'due south RTX line-upwards in the three games that support ray tracing thus far.

At present, we all know ray tracing on Pascal GPUs is going to suck, and so delight don't act surprised. if you take a GPU that doesn't accept any specific acceleration built in for a very performance intensive graphical effect, that's what's going to happen. But there are some interesting questions about ray tracing on Pascal that we wanted to respond.

Millions, huh?

The first question is to what caste will Pascal embarrass itself? Is a card like the Titan X faster than the slowest RTX GPU, the RTX 2060? Nvidia has showed a few benchmarks that give u.s. some indication but nosotros want to verify this with our own data, and in particular look at non just average frame rates, but i% lows and general performance swings within a gaming session.

The other question is whether you lot can nevertheless get some form of acceptable performance from a Pascal card while ray tracing, despite knowing full well that performance in general is not going to be cracking. For example, tin can this card run a game at above 30 FPS at 1080p with adequate ray tracing quality? This would allow some gamers to genuinely try out ray tracing without being forced to view a slideshow.

We used our Cadre i9-9900K test rig for these benchmarks coupled with 16GB of DDR4 memory. All the data has been gathered using the latest versions of the games with the latest drivers installed. Games similar Battlefield V are standing to optimize their ray tracing performance, so it's crucial with these sorts of tests to use up to date benchmark information. Yous'll see the areas nosotros've tested in each game as we get to them.

Let's kick things off with Shadow of the Tomb Raider... the latest game to include ray tracing through the grade of shadows. When we tested this game before we had plant that merely one of the three ray tracing modes made any sense to use, and that'southward the Ultra mode. The High mode produces worse visual quality than disabling ray tracing in our opinion, while Medium has a very limited scope for ray traced shadows. And so for today's testing we stuck to the Ultra mode.

As expected the Titan X fell betwixt the RTX 2070 and RTX 2080 when ray tracing is disabled and all other settings are set to their maximum level. However when enabling Ultra ray tracing, the Titan Ten immediately drops to a level of performance below the RTX 2060. In fact it'south 10% slower when looking at average frame rates, merely a huge 34% slower when viewing one% lows.

And this begins to illustrate one of the key problems with ray tracing on Pascal: the experience is very inconsistent. This is because there is such a large difference betwixt the capabilities of a card like the Titan 10 without ray tracing and with ray tracing. And then as you move around an environment with varying ray counts, interactions and degrees of ray tracing, the performance of the Titan Ten fluctuates massively. In areas with little ray tracing, functioning is decent but when yous're in an area with lots of shadows, your frame rate volition absolutely tank.

Equally y'all can see in the nautical chart, 1% low operation of 21 FPS is unplayable, and that's just at 1080p. But if you had gone past just the average performance, 47 FPS sounds alright, it sounds decent. The actual feel of playing the game though, is far from that. Of course you as well get a fluctuating frame rate with RTX GPUs including the RTX 2060, simply the result is less pronounced – the GPU is not as fast in areas without ray tracing, and it can keep upward amend when ray tracing is enabled. The 1% depression frame rate for the RTX 2060 was a touch over thirty FPS which isn't amazing but it's a far more than passable feel.

Moving to 1440p information technology gets even worse for the Titan Ten. Nosotros're down to a thirty FPS average and just a 14 FPS i% low, which is unplayable. The margins between the RTX 2060 and Titan X are a little narrower here as the 2060 also struggles at 1440p, only with the Titan clocking in more than 30 percent slower in the most intensive areas, Pascal simply can't proceed up.

Allow's take a expect at a more positive game for Pascal, and that's Battleground V. Hither our recommended setting is to utilize Low reflections which doesn't take as many furnishings as the High or Ultra modes, only it's a good starting point and these days the operation hit isn't nearly as bad every bit it in one case was.

At 1080p we're looking at a reasonably meaning drop in functioning for the Titan X, coming from well over 120 FPS with ray tracing disabled downwards to just 70 FPS on average with ray tracing. However one time again, 1% lows get hammered, halving hither from just low ray tracing.

Maybe the most interesting matter is that unlike with Shadow of the Tomb Raider, in Battlefield V Pascal is more competitive with the RTX 2060. On boilerplate it's a little faster, and in the most intensive areas it's a piddling slower. We aren't anywhere near the performance of the RTX 2080, which comes closest to the Titan X when ray tracing is disabled, but due to a fairly light implementation of ray tracing with the Low way, the Titan X isn't as overwhelmed and performs alright here.

In fact with a ane% depression of 46 FPS the game is playable. Performance still does fluctuate a lot simply at least it's not dipping to slideshow levels on the regular. And then at 1080p with Depression ray tracing and a menu as powerful every bit a Titan X or 1080 Ti, you could conceivably play the game without trigger-happy your hair out. Would anyone sacrifice over 100 FPS at this resolution for this operation? Probably not, but at least it'south possible to try it out.

At 1440p the state of affairs isn't every bit promising, with 1% lows closer to 30 FPS for the Titan Ten which in a multiplayer shooter is not acceptable. Nosotros're too starting to run across a divergence between the Titan X and RTX 2060: on average the Titan is faster, but it's much slower in the most intensive areas of our benchmark run. This makes sense equally more rays need to exist cast at higher resolutions, and any increment in ray tracing volition punish Pascal more than Turing RTX.

The concluding game nosotros're looking at here is Metro Exodus, which uses ray traced global illumination. When we first tested the game we used the benchmark tool only nosotros've since switched to an in-game run, focusing on the High mode which we feel is the all-time to utilise in the game based on our previous exploration.

Nosotros didn't carp testing 1440p in this title because at 1080p, nosotros're already at an unplayable level with the Titan X. A 30 FPS average with a 1% low of 23 FPS is not good. And in this game there is no ray tracing level below Highl so y'all can rule out Pascal entirely. The Titan X is behind the RTX 2060 past more than 30% which makes sense every bit global illumination is an intensive ray tracing upshot and i where acceleration is very useful.

Comparing the Titan Ten to something like the RTX 2080 shows that the RT cores are providing double to triple the performance with this effect enabled. We tin can expect a similar divergence between Pascal and accelerated Turing in games that utilise multiple ray tracing furnishings: the more effects are added, the more useful the RT cores become.

And so what does this investigation tell us overall?

  • At that place was no need to exam any GTX GPU slower than the Titan 10. Two of the three games are already unplayable at 1080p with the Titan.
  • The just test condition that was remotely usable was Battleground V at 1080p with Low ray tracing, but even then I would await a GTX 1080 to barely hit thirty FPS in the most intensive areas and performance to autumn abroad further from there.

  • Unless y'all have one of the top-end GTX cards and the ray traced furnishings aren't too intensive, Pascal is not fast enough to give gamers a usable ray tracing experience. As more ray traced games are released, Pascal is but going to fall further behind.
  • In a all-time case scenario, the Titan X matches the RTX 2060 for ray tracing capabilities, simply oft falls thirty% behind or more, especially when looking at crucial 1% low data. The Titan besides delivers less frame rate consistency. Unremarkably (no DXR) the Titan Ten is at least 25% faster than the RTX 2060 and more, up effectually RTX 2080 territory.

With that said, how much do the RT cores and other bits and bobs in the Turing compages help accelerate ray tracing compared to Pascal? This is more of an interest's sake blazon question, merely we at present have some rough data that can give some insights.

The main comparing would have to exist betwixt the Titan X and RTX 2080 which are reasonably matched outside of ray tracing; the RTX 2080 is faster but non by much. Merely when ray tracing is factored in, the RTX 2080 is anywhere from 26% faster with Depression reflections in Battlefield 5, to more than fifty% faster in Shadow of the Tomb Raider, to over twice every bit fast in Metro Exodus.

Because TU104, the GPU used in the RTX 2080, packs in only 13 percent more transistors than the Titan Ten and GTX 1080 Ti, we'd say this level of acceleration is actually reasonably impressive and justifies the actress RT cores, at least for these games and furnishings. Nvidia couldn't accept brute-forced ray tracing by cramming in more CUDA cores. The information does show that ray tracing with RT cadre acceleration is more efficient. We don't think the level of acceleration is disappointing either, more than a 2x improvement when ray tracing is heavily used is a decent offset from a first-gen design.

Of course, spending dice space on specialized cores for ray tracing doesn't help operation in the vast bulk of games, merely nosotros've already talked endlessly about the value proffer of ray tracing and RTX cards...

Finally we must wonder, why has Nvidia bothered testing and enabling ray tracing on Pascal? It doesn't run well even on loftier-end GPUs, it's unlikely to meliorate with future games, and information technology just seems like something people wouldn't use fifty-fifty if information technology was available.

We accept ii theories equally to why: The first is for developers. Lets say you have a development studio that invested heavily into Pascal and has loads of cards like this very Titan X in their dev machines. Rather than forcing developers into upgrading to Turing to develop games with ray tracing, allowing Pascal cards to ray trace, albeit slowly, could improve the adoption of ray tracing in games. Developers don't demand lx or fifty-fifty xxx FPS to test ray tracing in their games, so it could be handy for them. This has a variety of benefits for Nvidia every bit they are interested in improving adoption to sell more RTX cards.

Second: plain old marketing to incentivize RTX GPU upgrades. In our opinion ray tracing alone isn't enough to justify an upgrade only this volition piece of work for a number of Pascal gamers regardless.

Having features unlocked for more than GPU owners is generally a good thing and down the line there might be a ray traced game that actually does run well on Pascal. Simply like most of our articles on ray tracing so far, we're still in the very early stages for the engineering science and it will simply become a meaning factor in a few generations time.

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