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Nvidia RTX 2080 Ti vs Nvidia GTX 1080 Ti

Nvidia’s new RTX 20-series cards are available for pre-order, but should you upgrade if you already have a 10-series card? We answer all your burning questions by comparing the new RTX 2080 Ti with the GTX 1080 Ti.

  • US$1199
Nvidia announced its new range of consumer graphics cards at Gamescom 2018, but arguably left gamers with more questions than answers about the new RTX series.

The launch focused primarily on the fact that this is a brand-new 'Turing' architecture, 10 years in the making, and that the new cards can do something the old ones can’t: realtime ray-tracing.

Ok, so before we talk about ray-tracing, let’s make this simple: no, you should not pre-order a GTX 2080 Ti. Or a 2080 or a 2070. Our advice is to wait and see how things pan out first.

That applies to the vast majority of people. Here’s why:
  • The new cards are more expensive than the old ones were at launch
  • Few details are currently known about overclocked cards, and how much faster they are
  • Little is known about how much faster the new cards are than the old ones (for current games)
  • Ray-tracing isn’t supported in most current games
Until the new cards have been properly put through their paces, they remain something of an unknown quantity: they’re not merely an incremental update on previous generation as we’ve seen for the past few years.

However, if you’ve money to burn, go ahead and pre-order. You’ll probably be very happy with your new graphics card. Others, especially those on cards 3-4 years old might get a better bargain by waiting for 10-series cards to drop in price once the 20-series cards are on sale.

RT stands for ray-tracing, and it’s pretty much all Nvidia talked about during the launch.

Ray-tracing is not new. Far from it. Computers have been able to do it since the 1980s. Possibly even earlier. What’s important is that the new RTX cards can ray-trace a scene in realtime.

This is huge, especially for gamers. Realtime ray-tracing has been a feature gamers have wanted for ages (and game developers too) but until now, consumer graphics cards simply haven’t had the raw performance necessary to perform this feat at 30, 60 or even more frames per second.

Ray-tracing, for the uninitiated, is a technique where (as the name suggests) rays of light are traced from a virtual eye to their source, via objects they reflect off, intersect with or are absorbed by.

What it means is that games which support ray-tracing will look a lot more realistic than they do currently. Reflections, shadows – everything to do with lighting – will be more life-like with ray-tracing.

Overall, this is excellent news.

The problem is that it’s one of those chicken-and-egg situations: games can’t support ray-tracing until the hardware exists, developers won’t spend money adding ray-tracing support to their games until people own the cards, but no-one is going to buy a super-expensive card with nothing to play on it.

That’s a very simplistic way of looking at it, but the bottom line is that – as we said at the start – RTX cards are an unknown quantity in terms of how they perform with games right now.

We won’t go into the deep technical details, but the number of CUDA cores hasn’t risen significantly so if you already have a 1070, 1080 or 1080 Ti, it’s possible that upgrading to the new version won’t give you much of a boost in frame rates.

Here's a ray-traced scene to illustrate how life-like they can be:
Is the RTX 2080 Ti 10x faster than the GTX 1080 Ti?
No. Not for current games. Based on the fact it has 21% more CUDA cores and 27% more memory bandwidth, it is unlikely to be even 1.5x as fast, but until we can run some benchmarks we won’t know for sure.

The 10x faster claim comes from the fact that the RTX 2080 Ti is capable of  more 'Giga rays per second' than the 1080 Ti. That is a made-up measurement of performance because Nvidia says that traditional metrics “don’t capture the performance of these RTX cards”.

Leaving aside hard facts and figures for a second, then, the new cards should perform extremely well in games that support ray-tracing. But that is compared to the older cards which cannot do real-time ray-tracing at all.

In RTX-enabled games, a GTX 1080 Ti will simply render graphics as before, using rasterization. You can read more in Nvidia’s blog about the differences between the two techniques.

No. But quite a few will soon. Nvidia has released a list of 21 games which will support the new RTX cards’ capabilities.

It also clarified that having RTX support does not mean the game uses ray-tracing elements. RTX can also mean the game has AI elements (using Nvidia's DLSS).

Here are the 11 games which do support ray-tracing:
  • Assetto Corsa
  • Atomic Heart
  • Battlefield 5
  • Control
  • Enlisted
  • Justice
  • JX3
  • Metro Exodus
  • ProjectDH
  • Shadow of the Tomb Raider

It’s inevitable that other developers will get in on the act and update their games, but right now that is a pretty small list and if your favourite isn’t on it, then splashing out £1099/US$1199 on a 2080 Ti probably isn’t too sensible.

So you want the facts and figures. Fair enough. Here are the main ones. Note that Nvidia hasn’t officially said how many tensor cores are in the 2080 Ti.
RTX 2080 Ti
GTX 1080 Ti
August 2018
May 2016
Cuda cores
RT cores (Giga rays/s)
Tensor cores
544 (TBC)
Base speed
1350 MHz
1480 MHz
Boost speed
1545 MHz (1635 MHz *)
1582 MHz
Memory speed
Memory bandwidth
616 GB/sec
484 GB/sec
Power draw

What are the Tensor cores for?

They’re a slightly strange inclusion in a gaming card. In the enterprise versions of the Turing-based graphics cards, Tensor cores are for machine learning. It’s unclear what benefits they will bring to games, so right now, they’re not a reason to buy an RTX 2080 Ti over a 1080 Ti. 

Nvidia RTX 2080 Ti: Specs
  • Platform: Turing
  • CUDA cores: 4352
  • RT cores (Giga rays/s): 10
  • Tensor cores: 544 (TBC)
  • Base speed: 1350MHz
  • Boost speed: 1545MHz (1635MHz Founders Edition)
  • RAM: 11GB GDDR6
  • Memory speed: 14Gb/s
  • Memory bandwidth: 616 GB/sec
  • Power draw: 250W
View the original article here


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